Toyota Prius: Air Conditioning System (for Hev Model)

• Precaution
• Parts Location
• System Diagram
• How To Proceed With Troubleshooting
• Customize Parameters
• Initialization
• Utility
• Problem Symptoms Table
• Terminals Of Ecu
• Diagnosis System
• Lost Communication with Front Air Outlet Damper Control Servo Motor LIN Missing Message (B140287)
• Front Air Outlet Damper Control Servo Motor Actuator Stuck Off (B14037F)
• Room Temperature Sensor Circuit Short to Ground (B141A11)
• Room Temperature Sensor Circuit Short to Battery or Open (B141A15)
• A/C Inverter Load Malfunction (B142200)
• Servo Motor LIN Communication Bus off (B142A88)
• Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message (B143A87)
• Air Inlet Damper Control Servo Motor Actuator Stuck Off (B143B7F)
• A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range (B14711C)
• A/C Inverter High Voltage Output Circuit Voltage Out of Range (B14721C)
• A/C Inverter Cooling/Heating Over Temperature (B14744B)
• A/C Inverter Local Missing Message (B149887)
• Lost Communication with Front Panel LIN Missing Message (B14B287)
• Front Left Solar Sensor Circuit Short to Battery or Open (B14D215)
• Ambient Temperature Sensor Circuit Short to Ground (P007011)
• Ambient Temperature Sensor Circuit Short to Battery or Open (P007015)
• Refrigerant Pressure Sensor Circuit Short to Ground (P053011)
• Refrigerant Pressure Sensor Circuit Short to Battery or Open (P053015)
• Refrigerant Gas Fluid Leak or Seal Failure (P05347A)
• Evaporator Temperature Sensor Circuit Short to Ground (P053511)
• Lost Communication with ECM/PCM "A" Missing Message (U010087,U013187,U014087,U015587,U016387,U019887,U029387)
• Blower Motor Circuit
• Ambient Temperature Display System
• A/C Switch Indicator does not Turn On
• No Cooling at All
• Cooling is Poor
• No Heating at All
• Operation not Accepted Even If Air Conditioning Switch is Operated
• Front Window Fogging
• Blower Motor does not Operate
• Weak Blower Output
• Recirculated/Fresh Air Modes Switch without User Input
• Recirculated/Fresh Air Modes do not Switch
• Air Vent cannot be Switched

Precaution

PRECAUTION

DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME

*a	Charging Cylinder

ALWAYS WEAR EYE PROTECTION

BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN

If liquid refrigerant gets in your eyes or on your skin:

(a) Wash the area with lots of cold water.

CAUTION:

Do not rub your eyes or skin.

(b) Apply clean petroleum jelly to the skin.

(c) Go immediately to a hospital or see a physician for professional treatment.

NEVER HEAT CONTAINER OR EXPOSE CONTAINER TO AN OPEN FLAME

BE CAREFUL NOT TO DROP CONTAINER OR APPLY PHYSICAL SHOCKS TO IT

DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM

If there is not enough refrigerant in the air conditioning system, oil lubrication will be insufficient and the compressor may be damaged.

Necessary care should be taken to avoid this.

DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING

*a	Wrong
*b	Okay

Open and close only the low pressure valve.

If the high pressure valve is opened, refrigerant will flow in the reverse direction causing the charging cylinder to rupture.

BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT

If the system is overcharged with refrigerant, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.

DO NOT OPERATE ENGINE AND COMPRESSOR WITH NO REFRIGERANT

CAUTION:

Doing so may damage the inside of the compressor because the compressor parts always move regardless of whether the air conditioning system is turned on or off.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

This Toyota Prius vehicle is equipped with a Supplemental Restraint System (SRS). Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notices.

Click here

GENERAL PRECAUTION

While using the auxiliary battery during inspection, do not bring the positive ( ) and negative (-) tester probes too close to each other as a short circuit may occur.

PRECAUTIONS FOR DISCONNECTING CABLE FROM NEGATIVE (-) AUXILIARY BATTERY TERMINAL

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

Click here

HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

Parts Location

PARTS LOCATION

ILLUSTRATION

*1	COOLER CONDENSER ASSEMBLY	*2	COMPRESSOR WITH MOTOR ASSEMBLY
*3	AIR CONDITIONING PRESSURE SENSOR	*4	AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY)
*5	ECM	*6	BATTERY STATE SENSOR ASSEMBLY
*7	HV AIR CONDITIONING WIRE	*8	INVERTER WITH CONVERTER ASSEMBLY
*9	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - HTR FUSE - ECU-IGP NO. 3 FUSE	-	-

ILLUSTRATION

*A	w/o Automatic Light Control	*B	w/ Automatic Light Control
*1	AIR CONDITIONING AMPLIFIER ASSEMBLY	*2	AIR CONDITIONING CONTROL ASSEMBLY
*3	ROOM TEMP. SENSOR (COOLER THERMISTOR)	*4	SOLAR SENSOR (COOLER THERMISTOR)
*5	SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)	*6	HYBRID Toyota Prius Vehicle CONTROL ECU
*7	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)	*8	COMBINATION METER ASSEMBLY
*9	POWER STEERING ECU ASSEMBLY	*10	DCM (TELEMATICS TRANSCEIVER)
*11	RADIO AND DISPLAY RECEIVER ASSEMBLY	*12	POWER DISTRIBUTION BOX ASSEMBLY - ECU-B NO. 3 FUSE
*13	DLC3	-	-

ILLUSTRATION

*1	NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY	*2	EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR)
*3	HEATER RADIATOR UNIT SUB-ASSEMBLY	*4	BLOWER MOTOR WITH FAN SUB-ASSEMBLY
*5	COOLER EXPANSION VALVE	-	-

ILLUSTRATION

*1	NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY	*2	NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY
*3	AIR CONDITIONING HARNESS ASSEMBLY	-	-

System Diagram

SYSTEM DIAGRAM

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

PROCEDURE

1.	Toyota Prius Vehicle BROUGHT TO WORKSHOP

NEXT

2.	CUSTOMER PROBLEM ANALYSIS

NEXT

3.	INSPECT AUXILIARY BATTERY VOLTAGE

(a) Inspect the auxiliary battery voltage with the ignition switch off.

Standard Voltage:

11 to 14 V

If the auxiliary battery voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

NEXT

4.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Using the GTS, check for CAN communication system DTCs.

Click here

Result	Proceed to
CAN communication system DTCs are not output	A
CAN communication system DTCs are output	B

B

GO TO CAN COMMUNICATION SYSTEM

A

5.	CHECK FOR DTC*

(a) Check for DTCs and note any codes that are output.

Body Electrical > Air Conditioner > Trouble Codes

(b) Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs

(c) Recheck for DTCs. Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the operation indicated by the DTC.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

6.	CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Operate each switch on the air conditioning control assembly and check that the switches of the air conditioning system operate normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

7.	CHECK BLOWER CONTROL

(a) Operate the blower switch and check that the blower control operates normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

8.	CHECK AIR INLET CONTROL

(a) Operate the recirculation/fresh switch and check that the air inlet control operates normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

9.	CHECK AIR OUTLET CONTROL

(a) Operate the air outlet mode switch and check that the air outlet control operates normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

10.	CHECK COOLING FUNCTION

(a) Operate the temperature adjustment switches and check that cool air is blown from the registers.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

11.	CHECK HEATER FUNCTION

(a) Operate the temperature adjustment switches and check that warm air is blown from the air registers.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

12.	USE SIMULATION METHOD TO CHECK

Click here

NEXT

13.	CONFIRMATION TEST

NEXT

END

Customize Parameters

CUSTOMIZE PARAMETERS

CUSTOMIZE AIR CONDITIONING SYSTEM

(a) Customizing with the GTS.

(1) Select the setting by referring to the table below.

Air Conditioner

Tester Display	Description	Default	Setting	ECU
Foot/DEF Auto Mode	Function to turn the air flow from Foot/DEF ON automatically when AUTO MODE is ON.	$01:ON	$00:OFF,$01:ON	Air conditioning amplifier assembly
Efficient Ventilation Mode	Function to automatically change ambient air induction and room circulation is set.*1*2	$01:ON	$00:OFF,$01:ON	Air conditioning amplifier assembly
ECO Mode Control	This function switches ON/OFF of the controlling function of the air conditioning by ECO mode. If there is no ECO MODE switch, this customize function is not available.	$01:ON	$00:OFF,$01:ON	Air conditioning amplifier assembly
Outside Air Mode Auto Switch Function	This function switches ON/OFF of the function to switch the suction opening to the outside air mode automatically at the time of the ignition switch off.	$01:ON	$00:OFF,$01:ON	Air conditioning amplifier assembly
Noise and Vibration Reduction	Function to change speed of the compressor when item is ON.	$00:OFF	$00:OFF,$01:ON	Air conditioning amplifier assembly
Set Temperature Shift	Function to control with the shifted temperature against the display temperature.	$00:Normal	$05:-2C,$06:-1C,$00:Normal,$01: 1C,$02: 2C	Air conditioning amplifier assembly
Refrigerant Shortage Check	Function to cancel the refrigerant shortage check when item is OFF. (The verification mode is excluded.)	$01:ON	$00:OFF,$01:ON	Air conditioning amplifier assembly
A/C Auto Switch Mode	Function to turn the A/C ON automatically by pressing the AUTO button when the blower is ON and the A/C is OFF.*3	$01:ON	$00:OFF,$01:ON	Air conditioning amplifier assembly

(b) Customizing with the center display.

(1) Turn the ignition switch to ON.

(2) Enter the following menus: Settings → Toyota Prius Vehicle customize → Climate.

Climate settings

Function	Default	Setting	ECU
*1: The default setting is changed in conjunction with the settings of My Settings. *2: for Mexico *3: except Mexico
Switching between outside air and recirculated air mode linked to "AUTO" switch operation*1*2	On	On or Off	Air conditioning amplifier assembly
A/C auto switch operation*1*3	On	On or Off	Air conditioning amplifier assembly

Initialization

INITIALIZATION

SERVO MOTOR INITIALIZATION

(a) Press the A/C OFF switch.

(b) According to the GTS display, perform servo motor initialization.

Body Electrical > Air Conditioner > Utility

Tester Display
Servomotor Initialization

(c) Select Exit to complete initialization.

Utility

UTILITY

REFRIGERANT SHORTAGE CHECK USING GTS

(a) Prepare the vehicle according to the table below.

Measurement Condition:

Item	Condition
Toyota Prius Vehicle Condition	Ignition switch ON (READY)
A/C Switch	On
Ambient Temperature*1	0 to 49°C (32 to 120°F)
Air Conditioning Air Inlet Temperature*2	25 to 35°C (77 to 95°F)
Set Temperature	MAX COLD
Recirculation/fresh Control Switch	Recirculation
Air Vent Damper Position	FACE
Blower Speed	HI

HINT:

*1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.

*2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.

(b) Using the GTS, check the amount of refrigerant.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

NOTICE:

If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.

Result:

Result	Amount of Refrigerant	Corrective Action
Refrigerant shortage	Insufficient	Check for refrigerant leaks using a gas leak detector, and repair if necessary. Evacuate the air conditioning system and charge it with the appropriate volume of new or purified refrigerant. for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here
Refrigerant correct	Correct	-
Refrigerant incorrect	Incorrect	Confirm the conditions of the inspection and perform the check again.

REFRIGERANT PRESSURE HISTORY CLEAR

(a) Press the A/C OFF switch.

(b) According to the GTS display, perform refrigerant pressure history clear.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Pressure History Clear

A/C OPERATION LIMIT HISTORY COUNT CLEAR

(a) Press the A/C OFF switch.

(b) According to the GTS display, perform A/C operation limit history count clear.

Body Electrical > Air Conditioner > Utility

Tester Display
A/C Operation Limit History Count Clear

MY SETTINGS INITIALIZATION

(a) Press the A/C OFF switch.

(b) According to the GTS display, perform My Settings initialization.

Body Electrical > Air Conditioner > Utility

Tester Display
My Settings Initialization

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

Toyota Prius Vehicle CHECK ITEMS

Malfunction Operation/Function:

Common Function of Cool and Heater Function				Only Cool Air Function	Only Heater Function	Suspected Area
A/C Switch Operation	Blower Operation	Recirculation/Fresh Function	Air Outlet Changing Function
x	o	o	o	x	x	Go to "Problem Symptoms Table: Air Conditioning Control"
o	o	o	o	x	o	Go to "Problem Symptoms Table: Cooling Function"
o	o	o	o	o	x	Go to "Problem Symptoms Table: Heater Function"
o	x	o	o	x	x	Go to "Problem Symptoms Table: Blower Control"
o	o	x	o	x	x	Go to "Problem Symptoms Table: Air Inlet Control"
o	o	o	x	x	x	Go to "Problem Symptoms Table: Air Outlet Control"
x	x	x	x	x	x	Air Conditioning Amplifier Assembly or Air Conditioner Unit Assembly is Defective

AIR CONDITIONING CONTROL

Symptom	Suspected Area	Link
Air conditioning system cannot be operated using air conditioning control assembly (With the exception of the switch indicators, no inputs are reflected when other switches operated)	LIN communication line (air conditioning amplifier assembly - air conditioning control assembly) B or ground in air conditioning amplifier assembly circuit Air conditioning amplifier assembly Air conditioning control assembly Harness or connector
Air conditioning system cannot be operated using air conditioning control assembly (Air conditioning system display operates)	Air conditioning control assembly
Air conditioning system cannot be operated using air conditioning control assembly immediately after starting the hybrid system* (Air conditioning system display operates) (Only AUTO indicator illuminates) (A/C switch indicator does not illuminate)	Refer to "INITIALIZATION"
A/C switch indicator does not illuminate	Air conditioning amplifier assembly Air conditioning control assembly Servo motor Damper and damper link Refrigerant pressure Ambient temperature

COOLING FUNCTION

Symptom	Suspected Area	Link
Cool air is not discharged (Air is discharged)	Compressor with motor assembly Refrigerant pressure Refrigerant volume Cooler condenser assembly Cooling fan system Damper and damper link Evaporator temperature sensor
Cooling effectiveness is poor Cooling response is slow	ECO mode condition Compressor with motor assembly Refrigerant volume Cooler condenser assembly Cooling fan system Damper and damper link Solar sensor (cooler thermistor)*1 Solar sensor (automatic light control sensor)*2 High inlet air temperature Harness or connector

HEATER FUNCTION

Symptom	Suspected Area	Link
No warm air comes out (Blower control is normal) Outlet air temperature does not increase (Blower control is normal)	Engine coolant temperature Refrigerant volume Damper and damper link Warm-up control Heater radiator unit sub-assembly

BLOWER CONTROL

Symptom	Suspected Area	Link
No air flows from the registers	Blower motor with fan sub-assembly Air conditioning amplifier assembly Warm-up control Engine coolant temperature sensor Harness or connector
Airflow volume cannot be changed	Air conditioning amplifier assembly Blower motor with fan sub-assembly Harness or connector
Airflow volume is constantly low Airflow volume sometimes becomes low	ECO mode condition Blower motor with fan sub-assembly Air conditioning amplifier assembly Clean air filter Evaporator or heater radiator fins Evaporator temp. sensor Aspirator pipe not connected properly Harness or connector

AIR INLET CONTROL

Symptom	Suspected Area	Link
Recirculation/fresh mode changes without permission Recirculation/fresh mode light blinks	Customize setting* Ambient temperature Refrigerant pressure Air conditioning pressure sensor circuit Engine coolant temperature
Air inlet mode cannot be changed between recirculation/fresh Exhaust gas odors can be smelled when air inlet mode set to recirculation mode	Servo motor Damper and damper link Engine coolant temperature Air conditioner unit assembly

AIR OUTLET CONTROL

Symptom	Suspected Area	Link
Air outlet mode cannot be changed (Air outlet display changes)	Servo motor Damper link Air conditioner unit assembly
Air outlet mode cannot be changed (Air outlet display does not change)	Air conditioning control assembly

DEFROSTER CONTROL

Symptom	Suspected Area	Link
Windshield frequently fogs up	Compressor with motor assembly Refrigerant volume Servo motor Damper and damper link Cooler expansion valve Mechanical locking of damper and damper link

Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

for Type A: for Type B:

HINT:

Make sure to wait at least 2 minutes after turning the ignition switch off before performing an ECU terminal inspection.

Channel 1 (n3)

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
n3-2 (BUSG) - Body ground	Ground for BUS IC	Always	Below 1 Ω
n3-3 (BUS) - n3-2 (BUSG)	BUS IC control signal	Ignition switch ON	Pulse generation (See waveform "Servo LIN communication")
n3-4 (BUSB) - n3-2 (BUSG)	Power supply for BUS IC	Ignition switch off	11 to 14 V
n3-5 (SG-3) - Body ground	Ground for evaporator temp. sensor (No. 1 cooler thermistor)	Always	Below 1 Ω
n3-6 (TE) - n3-5 (SG-3)	Evaporator temp. sensor (No. 1 cooler thermistor) signal	Ignition switch ON Evaporator temperature: 0°C (32°F)	1.7 to 2.1 V
		Ignition switch ON Evaporator temperature: 15°C (59°F)	0.9 to 1.3 V

Channel 2 (K74)

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K74-2 (CANH) - K74-1 (CANL)	CAN communication system	Ignition switch ON	Pulse generation
K74-5 (B) - K74-17 (GND)	Power source (Back-up)	Ignition switch off	11 to 14 V
K74-6 (IG ) - K74-17 (GND)	Power source (IG)	Ignition switch ON	11 to 14 V
		Ignition switch off	Below 1 V
K74-7 (LIN1) - K74-17 (GND)	LIN communication signal (air conditioning control assembly)	Ignition switch ON	Pulse generation (See waveform "Control panel LIN communication")
K74-17 (GND) - Body ground	Ground for main power supply	Always	Below 1 Ω
K74-21 (BLW) - K74-17 (GND)	Blower motor speed control signal	Ignition switch ON Blower switch: LO	Pulse generation (See waveform "Blower")

Channel 3 (K73)

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
*: w/o Automatic Light Control
K73-1 (TAM) - K73-14 (SG-2)	Ambient temp. sensor (thermistor assembly) signal	Ignition switch ON Ambient temperature: 25°C (77°F)	1.05 to 1.45 V
		Ignition switch ON Ambient temperature: 40°C (104°F)	0.64 to 0.87 V
K73-2 (S5-1) - K74-17 (GND)*	Power supply for solar sensor (cooler thermistor)	Ignition switch ON	4.5 to 5.5 V
		Ignition switch off	Below 1 V
K73-3 (SG-1) - Body ground	Ground for room temp. sensor (cooler thermistor)	Always	Below 1 Ω
K73-5 (TR) - K73-3 (SG-1)	Room temp. sensor (cooler thermistor) signal	Ignition switch ON Cabin temperature: 25°C (77°F)	1.05 to 1.45 V
		Ignition switch ON Cabin temperature: 40°C (104°F)	0.64 to 0.87 V
K73-6 (PRE) - K73-15 (SG-4)	Air conditioning pressure sensor signal	Ignition switch ON (READY) Air conditioning system operating Refrigerant pressure: Normal pressure	0.74 to 4.61 V
K73-9 (TS) - K74-17 (GND)*	Solar sensor (cooler thermistor) signal	Ignition switch ON Solar sensor (cooler thermistor) subjected to electric light	0.8 to 4.3 V
		Ignition switch ON Solar sensor (cooler thermistor) covered with cloth	Below 0.8 V
K73-11 (S5-3) - K73-15 (SG-4)	Power supply for air conditioning pressure sensor	Ignition switch ON	4.75 to 5.25 V
		Ignition switch off	Below 1 V
K73-14 (SG-2) - Body ground	Ground for ambient temp. sensor (thermistor assembly)	Always	Below 1 Ω
K73-15 (SG-4) - Body ground	Ground for air conditioning pressure sensor	Always	Below 1 Ω

(a) Waveform "Servo LIN communication":

Item	Content
Terminal No.	n3-3 (BUS) - n3-2 (BUSG)
Tool Setting	2 V/DIV., 2 ms./DIV.
Condition	Ignition switch ON

(b) Waveform "Control panel LIN communication":

Item	Content
Terminal No.	K74-7 (LIN1) - K74-17 (GND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON

(c) Waveform "Blower":

Item	Content
Terminal No.	K74-21 (BLW) - K74-17 (GND)
Tool Setting	2 V/DIV., 1 ms./DIV.
Condition	Ignition switch ON Blower switch: LO

HINT:

The waveform varies with the blower speed.

CHECK AIR CONDITIONING CONTROL ASSEMBLY

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K68-1 (IG ) - K68-16 (GND)	Power source (IG)	Ignition switch off	Below 1 V
		Ignition switch ON	11 to 14 V
K68-14 (LIN1) - Body ground	LIN communication signal	Ignition switch ON	Pulse generation (See waveform)
K68-16 (GND) - Body ground	Ground for air conditioning control assembly	Always	Below 1 Ω

(a) Waveform:

Item	Content
Terminal No.	K68-14 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON

Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

Air conditioning system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the GTS to check for malfunctions and perform troubleshooting.

CHECK DLC3

Click here

Lost Communication with Front Air Outlet Damper Control Servo Motor LIN Missing Message (B140287)

DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly.

The No. 1 air conditioning radiator damper servo sub-assembly sends damper position information to the air conditioning amplifier assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B140287	Lost Communication with Front Air Outlet Damper Control Servo Motor LIN Missing Message	Diagnosis Condition: Ignition switch ON Malfunction: Error or open in communication line between air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly Detection Time: Continuously for 10 seconds or more	No. 1 air conditioning radiator damper servo sub-assembly	Memorized	Air Conditioner	B

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Error in communication line between air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly	○	-
	Open in communication line between air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly	-	○
Detection Time		Continuously for 10 seconds or more	Continuously for 10 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B142A88 is output	A
B142A88 is not output	B

A

GO TO DTC B142A88

B

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

Front Air Outlet Damper Control Servo Motor Actuator Stuck Off (B14037F)

DESCRIPTION

The No. 1 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position.

The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air outlet damper to the appropriate position, which controls the air outlet switching.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B14037F	Front Air Outlet Damper Control Servo Motor Actuator Stuck Off	Diagnosis Condition: No. 1 air conditioning radiator damper servo sub-assembly operating Malfunction: Damper servo operation request signals are output but the damper position sensor value does not change. Damper servo operation request signals are output but the damper position sensor value is abnormal. Detection Time: Continuously for 30 seconds or more	No. 1 air conditioning radiator damper servo sub-assembly Air conditioning harness assembly Air conditioning radiator assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	No. 1 air conditioning radiator damper servo sub-assembly operating	○	○
Malfunction	Damper servo operation request signals are output but the damper position sensor value does not change.	○	-
	Damper servo operation request signals are output but the damper position sensor value is abnormal.	-	○
Detection Time		Continuously for 30 seconds or more	Continuously for 30 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

HINT:

Click here

OK:

No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

NG

REINSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

OK

2.	CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

(a) Check for a wire harness caught between the links of the motors and dampers.

OK:

No wire harnesses are caught between the links of the motors and dampers.

NG

REMOVE PINCHED WIRE HARNESS

OK

3.	CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

Pre-procedure1

(a) Remove the No. 1 air conditioning radiator damper servo sub-assembly.

HINT:

Click here

Procedure1

(b) Operate the dampers by hand.

OK:

The dampers are easily operated by hand.

Post-procedure1

(c) None

OK

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

NG

REPAIR OR REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

Room Temperature Sensor Circuit Short to Ground (B141A11)

DESCRIPTION

The room temp. sensor (cooler thermistor) is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the room temp. sensor (cooler thermistor) changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the room temp. sensor (cooler thermistor) and reads voltage changes due to changes in the resistance of the room temp. sensor (cooler thermistor).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B141A11	Room Temperature Sensor Circuit Short to Ground	Diagnosis Condition: Ignition switch ON Malfunction: Short (GND) in room temperature sensor circuit Detection Time: Continuously for 4 seconds or more	Room temp. sensor (cooler thermistor) Harness or connector Air conditioning amplifier assembly	Memorized	Air Conditioner	A

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING GTS (ROOM TEMPERATURE SENSOR)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Room Temperature Sensor	Room temp. sensor (cooler thermistor)	-327.68 to 327.67°C	Actual cabin temperature displayed	Room temp. sensor (cooler thermistor) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Room Temperature Sensor

OK:

The display is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.	INSPECT ROOM TEMP. SENSOR (COOLER THERMISTOR)

Click here

NG

REPLACE ROOM TEMP. SENSOR (COOLER THERMISTOR)

OK

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ROOM TEMP. SENSOR (COOLER THERMISTOR))

Pre-procedure1

(a) Disconnect the K67 room temp. sensor (cooler thermistor) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(K67,K73) Click Connector(K67) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
K67-1 ( ) or K73-5 (TR) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
K67-2 (-) or K73-3 (SG-1) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Room Temperature Sensor Circuit Short to Battery or Open (B141A15)

DESCRIPTION

The room temp. sensor (cooler thermistor) is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the room temp. sensor (cooler thermistor) changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the room temp. sensor (cooler thermistor) and reads voltage changes due to changes in the resistance of the room temp. sensor (cooler thermistor).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B141A15	Room Temperature Sensor Circuit Short to Battery or Open	Diagnosis Condition: Ignition switch ON Malfunction: Open or short ( B) in room temperature sensor circuit Detection Time: Continuously for 4 seconds or more	Room temp. sensor (cooler thermistor) Harness or connector Air conditioning amplifier assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Open in room temperature sensor circuit	○	-
	Short ( B) in room temperature sensor circuit	-	○
Detection Time		Continuously for 4 seconds or more	Continuously for 4 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING GTS (ROOM TEMPERATURE SENSOR)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Room Temperature Sensor	Room temp. sensor (cooler thermistor)	-327.68 to 327.67°C	Actual cabin temperature displayed	Room temp. sensor (cooler thermistor) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Room Temperature Sensor

OK:

The display is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.	INSPECT ROOM TEMP. SENSOR (COOLER THERMISTOR)

Click here

NG

REPLACE ROOM TEMP. SENSOR (COOLER THERMISTOR)

OK

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ROOM TEMP. SENSOR (COOLER THERMISTOR))

Pre-procedure1

(a) Disconnect the K67 room temp. sensor (cooler thermistor) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(K67,K73) Click Connector(K67) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
K67-1 ( ) - K73-5 (TR)	Always	Below 1 Ω	Ω
K67-2 (-) - K73-3 (SG-1)	Always	Below 1 Ω	Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(K73) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
K73-5 (TR) - Body ground	Ignition switch ON	Below 1 V	V
K73-3 (SG-1) - Body ground	Ignition switch ON	Below 1 V	V

Post-procedure1

(e) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

A/C Inverter Load Malfunction (B142200)

DESCRIPTION

The operation of the compressor with motor assembly is stopped and this DTC is stored if the rotation load is too large or too small while the compressor with motor assembly is operating.

HINT:

Possible causes are refrigerant leaks, overcharged refrigerant, insufficient cooling due to a condenser fan circuit malfunction, or compressor lock.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B142200	A/C Inverter Load Malfunction	Diagnosis Condition: There is a compressor operation request. Malfunction: The rotational load when the compressor is operating is too large or too small. Detection Time: -	Cooling fan system Refrigerant volume Compressor with motor assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	There is a compressor operation request.	○	○
Malfunction	The rotational load when the compressor is operating is too large.	○	-
	The rotational load when the compressor is operating is too small.	-	○
Detection Time		-	-
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

CAUTION / NOTICE / HINT

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Powertrain > Engine > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Engine Cooling Fan	Control electric cooling fan motor	OFF/Low/High	Perform this test when Toyota Prius vehicle is stopped.

Powertrain > Engine > Active Test

Tester Display
Control the Engine Cooling Fan

OK:

Electric cooling fan operates smoothly.

NG

GO TO COOLING FAN SYSTEM for M20A-FXS: Click here for 2ZR-FXE: Click here

OK

2.	CHECK REFRIGERANT PRESSURE

Pre-procedure1

(a) Install a manifold gauge set.

HINT:

for HFC-134a(R134a): Click here

for HFO-1234yf(R1234yf): Click here

(b) Prepare the Toyota Prius vehicle according to the table below.

Measurement Condition:

Item	Condition
Doors	Fully open
A/C Switch	On
Recirculation/fresh Control Switch	Recirculation
Set Temperature	MAX COLD
Blower Speed	HI
Air Conditioning Air Inlet Temperature	25 to 35°C (77 to 95°F)

Procedure1

(c) Read the manifold gauge pressure.

Standard Pressure:

Item	Specified Condition	Result
High pressure side	1370 to 1570 kPa 14 to 16 kgf/cm2 199 to 228 psi	kPa kgf/cm2 psi
Low pressure side	150 to 250 kPa 1.5 to 2.5 kgf/cm2 22 to 36 psi	kPa kgf/cm2 psi

Post-procedure1

(d) None

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY for 2ZR-FXE: Click here for M20A-FXS: Click here

NG

CHARGE REFRIGERANT for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

Servo Motor LIN Communication Bus off (B142A88)

DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors.

The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly.

Each servo motor sends damper position information to the air conditioning amplifier assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B142A88	Servo Motor LIN Communication Bus off	Diagnosis Condition: Ignition switch ON Malfunction: Error or open in communication line between air conditioning amplifier assembly and each servo motor Detection Time: Continuously for 10 seconds or more	Air conditioning harness assembly No. 1 air conditioning radiator damper servo sub-assembly Air conditioning amplifier assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Error in communication line between air conditioning amplifier assembly and each servo motor	○	-
	Open in communication line between air conditioning amplifier assembly and each servo motor	-	○
Detection Time		Continuously for 10 seconds or more	Continuously for 10 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

PROCEDURE

1.	CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NOTICE:

When inspecting the air conditioning amplifier assembly, be careful not to cause a short.

Pre-procedure1

(a) Disconnect the n3 air conditioning amplifier assembly connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

for Type A:

*a

Component without harness connected (Air Conditioning Amplifier Assembly)

-

-

for Type B:

*a

Component without harness connected (Air Conditioning Amplifier Assembly)

-

-

Standard Resistance:

Click Location & Routing(n3) Click Connector(n3)

Tester Connection	Condition	Specified Condition	Result
n3-2 (BUSG) - Body ground	Always	Below 1 Ω	Ω

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(n3) Click Connector(n3)

Tester Connection	Condition	Specified Condition	Result
n3-4 (BUSB) - n3-2 (BUSG)	Ignition switch off	11 to 14 V	V

Post-procedure1

(d) None

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

OK

2.	CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NOTICE:

When inspecting the air conditioning amplifier assembly, be careful not to cause a short.

Pre-procedure1

(a) Disconnect the n3 air conditioning amplifier assembly connector.

Procedure1

(b) Using an oscilloscope, check the waveform.

for Type A:

*a

Component without harness connected (Air Conditioning Amplifier Assembly)

-

-

for Type B:

*a

Component without harness connected (Air Conditioning Amplifier Assembly)

-

-

Item	Content
Tester Connection	n3-3 (BUS) - n3-2 (BUSG)
Tool Setting	2 V/DIV., 20 μs/DIV.
Condition	Ignition switch ON

OK:

The waveform displays properly.

Post-procedure1

(c) None

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

OK

3.	CHECK AIR CONDITIONING HARNESS ASSEMBLY

Pre-procedure1

(a) Disconnect the n3 air conditioning amplifier assembly connector.

(b) Disconnect the n4 No. 1 air conditioning radiator damper servo sub-assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

*a

Front view of wire harness connector (to No. 1 Air Conditioning Radiator Damper Servo Sub-assembly)

*b

Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

Standard Resistance:

Click Location & Routing(n3,n4) Click Connector(n3) Click Connector(n4)

Tester Connection	Condition	Specified Condition	Result
n3-2 (BUSG) - n4-6 (BUSG)	Always	Below 1 Ω	Ω
n3-3 (BUS) - n4-7 (BUS)	Always	Below 1 Ω	Ω
n3-4 (BUSB) - n4-8 (BUSB)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

OK

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message (B143A87)

DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly.

The No. 1 blower damper servo sub-assembly sends damper position information to the air conditioning amplifier assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B143A87	Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message	Diagnosis Condition: Ignition switch ON Malfunction: Error or open in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly Detection Time: Continuously for 10 seconds or more	Air conditioning harness assembly No. 1 blower damper servo sub-assembly	Memorized	Air Conditioner	B

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Error in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly	○	-
	Open in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly	-	○
Detection Time		Continuously for 10 seconds or more	Continuously for 10 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B142A88 is output	A
B142A88 is not output	B

A

GO TO DTC B142A88

B

2.	INSPECT AIR CONDITIONING HARNESS ASSEMBLY

Pre-procedure1

(a) Disconnect the n4 No. 1 air conditioning radiator damper servo sub-assembly connector.

(b) Disconnect the n1 No. 1 blower damper servo sub-assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

*a

Front view of wire harness connector (to No. 1 Air Conditioning Radiator Damper Servo Sub-assembly)

*b

Front view of wire harness connector (to No. 1 Blower Damper Servo Sub-assembly)

Standard Resistance:

Click Location & Routing(n4,n1) Click Connector(n4) Click Connector(n1)

Tester Connection	Condition	Specified Condition	Result
n4-1 (M-) - n1-5 (M-)	Always	Below 1 Ω	Ω
n4-2 (M ) - n1-4 (M )	Always	Below 1 Ω	Ω
n4-3 (STE2) - n1-3 (STE2)	Always	Below 1 Ω	Ω
n4-4 (STE1) - n1-2 (STE1)	Always	Below 1 Ω	Ω
n4-5 (GND) - n1-1 (GND)	Always	Below 1 Ω	Ω
n4-1 (M-) or n1-5 (M-) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
n4-2 (M ) or n1-4 (M ) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
n4-3 (STE2) or n1-3 (STE2) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
n4-4 (STE1) or n1-2 (STE1) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Air Inlet Damper Control Servo Motor Actuator Stuck Off (B143B7F)

DESCRIPTION

The No. 1 blower damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position.

The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 1 blower damper servo sub-assembly to the appropriate position to change the air inlet mode (fresh, recirculation/fresh, and recirculation).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B143B7F	Air Inlet Damper Control Servo Motor Actuator Stuck Off	Diagnosis Condition: No. 1 blower damper servo sub-assembly operating Malfunction: Air inlet damper servo operation request signals are output but the air inlet damper position sensor value does not change. Air inlet damper servo operation request signals are output but the air inlet damper position sensor value is abnormal. Detection Time: Continuously for 30 seconds or more	No. 1 blower damper servo sub-assembly No. 1 air conditioning radiator damper servo sub-assembly Air conditioning harness assembly Blower assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	No. 1 blower damper servo sub-assembly operating	○	○
Malfunction	Air inlet damper servo operation request signals are output but the air inlet damper position sensor value does not change.	○	-
	Air inlet damper servo operation request signals are output but the air inlet damper position sensor value is abnormal.	-	○
Detection Time		Continuously for 30 seconds or more	Continuously for 30 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
Any of the DTCs in the table below are output	A
No DTCs in the table below are output	B

Relevant DTC
B14037F	Front Air Outlet Damper Control Servo Motor Actuator Stuck Off
B14067F	Front Air Mix Damper Control Servo Motor Actuator Stuck Off

A

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

B

2.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Air Inlet Damper Control Servo Motor	This test activates the Air Inlet Damper Control Servo Motor. (No. 1 blower damper servo sub-assembly)	128: Min 384: Max	Operate with ignition switch ON.

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Inlet Damper Control Servo Motor

OK:

No. 1 blower damper servo sub-assembly is operated.

NG

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

OK

3.	CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.

HINT:

Click here

OK:

No. 1 blower damper servo sub-assembly is installed correctly.

NG

REINSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

OK

4.	CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

(a) Check for a wire harness caught between the links of the motors and dampers.

OK:

No wire harnesses are caught between the links of the motors and dampers.

NG

REMOVE PINCHED WIRE HARNESS

OK

5.	CHECK BLOWER ASSEMBLY (DAMPER)

Pre-procedure1

(a) Remove the No. 1 blower damper servo sub-assembly.

HINT:

Click here

Procedure1

(b) Operate the dampers by hand.

OK:

The dampers are easily operated by hand.

Post-procedure1

(c) None

NG

REPAIR OR REPLACE BLOWER ASSEMBLY

OK

6.	INSPECT AIR CONDITIONING HARNESS ASSEMBLY

Pre-procedure1

(a) Disconnect the n4 No. 1 air conditioning radiator damper servo sub-assembly connector.

(b) Disconnect the n1 No. 1 blower damper servo sub-assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

*a

Front view of wire harness connector (to No. 1 Air Conditioning Radiator Damper Servo Sub-assembly)

*b

Front view of wire harness connector (to No. 1 Blower Damper Servo Sub-assembly)

Standard Resistance:

Click Location & Routing(n4,n1) Click Connector(n4) Click Connector(n1)

Tester Connection	Condition	Specified Condition	Result
n4-1 (M-) - n1-5 (M-)	Always	Below 1 Ω	Ω
n4-2 (M ) - n1-4 (M )	Always	Below 1 Ω	Ω
n4-3 (STE2) - n1-3 (STE2)	Always	Below 1 Ω	Ω
n4-4 (STE1) - n1-2 (STE1)	Always	Below 1 Ω	Ω
n4-5 (GND) - n1-1 (GND)	Always	Below 1 Ω	Ω
n4-1 (M-) or n1-5 (M-) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
n4-2 (M ) or n1-4 (M ) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
n4-3 (STE2) or n1-3 (STE2) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
n4-4 (STE1) or n1-2 (STE1) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

NG

REPAIR AIR CONDITIONING HARNESS ASSEMBLY

A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range (B14711C)

DESCRIPTION

The hybrid vehicle control ECU monitors the voltage of the HV battery. The hybrid vehicle control ECU stops compressor control and stores this DTC when the monitored voltage is outside the specified range.

This DTC will be stored as a history DTC. Compressor control may not resume unless the ignition switch is turned off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B14711C	A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range	Diagnosis Condition: Ignition switch ON Malfunction: Open or short in A/C inverter high voltage power resource system Damage or malfunction in voltage booster system Detection Time: -	Hybrid control system HV air conditioning wire Compressor with motor assembly	Memorized	Air Conditioner	B

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Ignition switch ON	○	○	○
Malfunction	Open in A/C inverter high voltage power resource system	○	-	-
	Short in A/C inverter high voltage power resource system	-	○	-
	Voltage booster system damage or malfunction	-	-	○
Detection Time		-	-	-
Trip Count		1 trip	1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

for M20A-FXS: for 2ZR-FXE:

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK FOR DTC (HYBRID CONTROL SYSTEM)

(a) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

B

GO TO HYBRID CONTROL SYSTEM for 2ZR-FXE: Click here for M20A-FXS: Click here

A

2.	INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

Pre-procedure1

(a) Disconnect the f1 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(b) Remove the HV air conditioning wire from the inverter with converter assembly.

NOTICE:

Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

HINT:

Click here

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(f1,f3) Click Connector(f1) Click Connector(f3)

Tester Connection	Condition	Specified Condition	Result
f1-2 (PB) - f3-1 (ACPB)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

NG

GO TO STEP 4

OK

3.	INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

Pre-procedure1

(a) Disconnect the f1 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(b) Remove the HV air conditioning wire from the inverter with converter assembly.

NOTICE:

Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

HINT:

Click here

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(f1,f3) Click Connector(f1) Click Connector(f3)

Tester Connection	Condition	Specified Condition	Result
f1-1 (PE) - f3-2 (ACPE)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY for 2ZR-FXE: Click here for M20A-FXS: Click here

NG

REPLACE HV AIR CONDITIONING WIRE

4.	INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

Pre-procedure1

(a) Disconnect the f1 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(b) Remove the HV air conditioning wire from the inverter with converter assembly.

NOTICE:

Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

HINT:

Click here

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(f1) Click Connector(f1)

Tester Connection	Condition	Specified Condition	Result
f1-2 (PB) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY AND HV AIR CONDITIONING WIRE Compressor with motor assembly: for 2ZR-FXE: Click here for M20A-FXS: Click here HV air conditioning wire: Click here

NG

REPLACE HV AIR CONDITIONING WIRE

A/C Inverter High Voltage Output Circuit Voltage Out of Range (B14721C)

DESCRIPTION

The inverter in the compressor with motor assembly outputs high voltage to operate the motor. If there is an open or short in the output circuit, the hybrid vehicle control ECU will stop compressor operation and store this DTC. This DTC will be stored as a history DTC. The compressor operation remains stopped until both the history and current DTCs are cleared.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B14721C	A/C Inverter High Voltage Output Circuit Voltage Out of Range	Diagnosis Condition: There is a compressor operation request. Malfunction: Open or short in A/C inverter high voltage output circuit Detection Time: -	Compressor with motor assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	There is a compressor operation request.	○	○
Malfunction	Open in A/C inverter high voltage output circuit	○	-
	Short in A/C inverter high voltage output circuit	-	○
Detection Time		-	-
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

CAUTION / NOTICE / HINT

PROCEDURE

1.	REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

(a) Replace the compressor with motor assembly.

NOTICE:

If this DTC is output even once, replace the compressor with motor assembly as an internal malfunction has occurred.

HINT:

for 2ZR-FXE: Click here

for M20A-FXS: Click here

NEXT

END

A/C Inverter Cooling/Heating Over Temperature (B14744B)

DESCRIPTION

The temperature sensor of the compressor with motor assembly detects the A/C inverter temperature.

If the temperature exceeds the maximum, operation of the compressor with motor assembly will be stopped, and this DTC will be stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B14744B	A/C Inverter Cooling/Heating Over Temperature	Diagnosis Condition: Ignition switch ON Malfunction: A/C inverter temperature is outside the specified range (temperature too high) Detection Time: -	Cooling fan system Refrigerant volume Compressor with motor assembly	Memorized	Air Conditioner	A

CAUTION / NOTICE / HINT

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Powertrain > Engine > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Engine Cooling Fan	Control electric cooling fan motor	OFF/Low/High	Perform this test when Toyota Prius vehicle is stopped.

Powertrain > Engine > Active Test

Tester Display
Control the Engine Cooling Fan

OK:

Electric cooling fan operates smoothly.

NG

GO TO COOLING FAN SYSTEM for M20A-FXS: Click here for 2ZR-FXE: Click here

OK

2.	CHECK REFRIGERANT PRESSURE

Pre-procedure1

(a) Install a manifold gauge set.

HINT:

for HFC-134a(R134a): Click here

for HFO-1234yf(R1234yf): Click here

(b) Prepare the Toyota Prius vehicle according to the table below.

Measurement Condition:

Item	Condition
Doors	Fully open
A/C Switch	On
Recirculation/fresh Control Switch	Recirculation
Set Temperature	MAX COLD
Blower Speed	HI
Air Conditioning Air Inlet Temperature	25 to 35°C (77 to 95°F)

Procedure1

(c) Read the manifold gauge pressure.

Standard Pressure:

Item	Specified Condition	Result
High pressure side	1370 to 1570 kPa 14 to 16 kgf/cm2 199 to 228 psi	kPa kgf/cm2 psi
Low pressure side	150 to 250 kPa 1.5 to 2.5 kgf/cm2 22 to 36 psi	kPa kgf/cm2 psi

Post-procedure1

(d) None

NG

CHARGE REFRIGERANT for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

OK

3.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs

NEXT

4.	CHECK FOR DTC

Pre-procedure1

(a) Set the Toyota Prius vehicle condition when the DTCs are output.

(1) Set the "Inspection Mode".

HINT:

Click here

(2) Prepare the vehicle according to the table below for 30 minutes or more.

Item	Condition
Blower Speed	HI
A/C Switch	On
Set Temperature	MAX COLD

Procedure1

(b) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

NOTICE:

If the engine keeps idling when the ambient temperature is high, the compressor with motor assembly may automatically stop to protect the inverter circuit, and DTC B14744B may be stored.

Result	Proceed to
B14744B is not output	A
B14744B is output	B

Post-procedure1

(c) None

A

USE SIMULATION METHOD TO CHECK

B

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY for 2ZR-FXE: Click here for M20A-FXS: Click here

A/C Inverter Local Missing Message (B149887)

DESCRIPTION

The hybrid vehicle control ECU and compressor with motor assembly communicate via a direct line. Compressor control is stopped and this DTC is stored if communication information is cut off or abnormal information occurs.

This DTC is also detected if high-voltage power supplied from the inverter with converter assembly to the compressor control circuit is shut off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B149887	A/C Inverter Local Missing Message	Diagnosis Condition: Ignition switch ON (READY) Malfunction: Error or open in communication line between the hybrid Toyota Prius vehicle control ECU and compressor with motor assembly High-voltage power source shut off Detection Time: -	Harness or connector HV air conditioning wire Compressor with motor assembly Hybrid Toyota Prius vehicle control ECU Battery state sensor assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Ignition switch ON (READY)	○	○	○
Malfunction	Error in communication line between the hybrid Toyota Prius vehicle control ECU and compressor with motor assembly	○	-	-
	Open in communication line between the hybrid Toyota Prius vehicle control ECU and compressor with motor assembly	-	○	-
	High-voltage power source shut off	-	-	○
Detection Time		-	-	-
Trip Count		1 trip	1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

for M20A-FXS: for 2ZR-FXE:

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK FOR DTC (HYBRID CONTROL)

(a) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
P058A01 and P162B87 are not output	A
P058A01 or P162B87 is output	B

B

GO TO STEP 7

A

2.	CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

CAUTION:

Do not disconnect the connector on the high-voltage side.

NOTICE:

As other DTCs will be stored when the ignition switch is turned to ON with the connector disconnected, be sure to clear the DTCs after the inspection.

Pre-procedure1

(a) Disconnect the C57 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

Procedure1

(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: Click Location & Routing(C57) Click Connector(C57) Tester Connection Condition Specified Condition Result C57-1 (IG1) - Body ground Ignition switch ON 11 to 14 V V

*a Front view of wire harness connector (to Compressor with Motor Assembly)

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C57) Click Connector(C57)

Tester Connection	Condition	Specified Condition	Result
C57-2 (GND) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - HYBRID Toyota Prius Vehicle CONTROL ECU)

Pre-procedure1

(a) Disconnect the C57 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(b) Disconnect the A57 hybrid vehicle control ECU connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C57,A57) Click Connector(C57) Click Connector(A57)

Tester Connection	Condition	Specified Condition	Result
C57-3 (DOUT) - A57-16 (LIN3)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

Pre-procedure1

(a) Disconnect the f1 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(b) Remove the HV air conditioning wire from the inverter with converter assembly.

NOTICE:

Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

HINT:

Click here

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(f1,f3) Click Connector(f1) Click Connector(f3)

Tester Connection	Condition	Specified Condition	Result
f1-2 (PB) - f3-1 (ACPB)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

NG

GO TO STEP 6

OK

5.	INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

Pre-procedure1

(a) Disconnect the f1 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(b) Remove the HV air conditioning wire from the inverter with converter assembly.

NOTICE:

Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

HINT:

Click here

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(f1,f3) Click Connector(f1) Click Connector(f3)

Tester Connection	Condition	Specified Condition	Result
f1-1 (PE) - f3-2 (ACPE)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY for 2ZR-FXE: Click here for M20A-FXS: Click here

NG

REPLACE HV AIR CONDITIONING WIRE

6.	INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

Pre-procedure1

(a) Disconnect the f1 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(b) Remove the HV air conditioning wire from the inverter with converter assembly.

NOTICE:

Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

HINT:

Click here

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(f1) Click Connector(f1)

Tester Connection	Condition	Specified Condition	Result
f1-2 (PB) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY AND HV AIR CONDITIONING WIRE Compressor with motor assembly: for 2ZR-FXE: Click here for M20A-FXS: Click here HV air conditioning wire: Click here

NG

REPLACE HV AIR CONDITIONING WIRE

7.	CONFIRM MODEL

Result	Proceed to
for M20A-FXS	A
for 2ZR-FXE	B

B

GO TO STEP 11

A

8.	CHECK FOR DTC

Pre-procedure1

(a) Disconnect the R29 battery state sensor assembly connector.

Procedure1

(b) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B149887 is not output	A
B149887 is output	B

Post-procedure1

(c) None

A

REPLACE BATTERY STATE SENSOR ASSEMBLY

B

9.	CHECK FOR DTC (HYBRID CONTROL)

Pre-procedure1

(a) Connect the R29 battery state sensor assembly connector.

(b) Disconnect the C57 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

Procedure1

(c) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
P058A01 and P162B87 are not output	A
P058A01 or P162B87 is output	B

Post-procedure1

(d) None

A

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

B

10.	CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - HYBRID Toyota Prius Vehicle CONTROL ECU)

Pre-procedure1

(a) Disconnect the R29 battery state sensor assembly connector.

(b) Disconnect the C57 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(c) Disconnect the A57 hybrid Toyota Prius vehicle control ECU connector.

Procedure1

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A57,C57,R29) Click Connector(A57) Click Connector(C57) Click Connector(R29)

Tester Connection	Condition	Specified Condition	Result
A57-16 (LIN3) - C57-3 (DOUT)	Always	Below 1 Ω	Ω
A57-16 (LIN3) - R29-2 (LIN)	Always	Below 1 Ω	Ω
A57-16 (LIN3) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
C57-3 (DOUT) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
R29-2 (LIN) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(e) None

OK

REPLACE HYBRID Toyota Prius Vehicle CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	CHECK FOR DTC

Pre-procedure1

(a) Disconnect the A93 battery state sensor assembly connector.

Procedure1

(b) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B149887 is not output	A
B149887 is output	B

Post-procedure1

(c) None

A

REPLACE BATTERY STATE SENSOR ASSEMBLY

B

12.	CHECK FOR DTC (HYBRID CONTROL)

Pre-procedure1

(a) Connect the A93 battery state sensor assembly connector.

(b) Disconnect the C57 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

Procedure1

(c) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
P058A01 and P162B87 are not output	A
P058A01 or P162B87 is output	B

Post-procedure1

(d) None

A

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

B

13.	CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - HYBRID Toyota Prius Vehicle CONTROL ECU)

Pre-procedure1

(a) Disconnect the A93 battery state sensor assembly connector.

(b) Disconnect the C57 compressor with motor assembly connector.

NOTICE:

Do not allow any foreign matter or water to enter the compressor with motor assembly.

(c) Disconnect the A57 hybrid Toyota Prius vehicle control ECU connector.

Procedure1

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A57,C57,A93) Click Connector(A57) Click Connector(C57) Click Connector(A93)

Tester Connection	Condition	Specified Condition	Result
A57-16 (LIN3) - C57-3 (DOUT)	Always	Below 1 Ω	Ω
A57-16 (LIN3) - A93-2 (LIN)	Always	Below 1 Ω	Ω
A57-16 (LIN3) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
C57-3 (DOUT) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
A93-2 (LIN) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(e) None

OK

REPLACE HYBRID Toyota Prius Vehicle CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Lost Communication with Front Panel LIN Missing Message (B14B287)

DESCRIPTION

The air conditioning control assembly communicates with the air conditioning amplifier assembly via LIN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B14B287	Lost Communication with Front Panel LIN Missing Message	Diagnosis Condition: Ignition switch ON Malfunction: Error or open in communication line between air conditioning amplifier assembly and air conditioning control assembly Detection Time: Continuously for 10 seconds or more	Harness or connector Air conditioning control assembly Air conditioning amplifier assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Error in communication line between air conditioning amplifier assembly and air conditioning control assembly	○	-
	Open in communication line between air conditioning amplifier assembly and air conditioning control assembly	-	○
Detection Time		Continuously for 10 seconds or more	Continuously for 10 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AUXILIARY BATTERY)

Pre-procedure1

(a) Disconnect the K68 air conditioning control assembly connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(K68) Click Connector(K68)

Tester Connection	Condition	Specified Condition	Result
K68-1 (IG ) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(c) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND)

Pre-procedure1

(a) Disconnect the K68 air conditioning control assembly connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(K68) Click Connector(K68)

Tester Connection	Condition	Specified Condition	Result
K68-16 (GND) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

(c) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)

Pre-procedure1

(a) Disconnect the K68 air conditioning control assembly connector.

(b) Disconnect the K74 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(K68,K74) Click Connector(K68) Click Connector(K74)

Tester Connection	Condition	Specified Condition	Result
K68-14 (LIN1) - K74-7 (LIN1)	Always	Below 1 Ω	Ω
K68-14 (LIN1) or K74-7 (LIN1) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT)

Pre-procedure1

(a) Disconnect the K68 air conditioning control assembly connector.

(b) Connect the K74 air conditioning amplifier assembly connector.

Procedure1

(c) Using an oscilloscope, check the waveform. Item Content Tester Connection K74-7 (LIN1) - Body ground Tool Setting 2 V/DIV., 20 μs/DIV. Condition Ignition switch ON OK: The waveform displays properly. Result: Proceed to OK NG

Post-procedure1

(d) None

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

OK

5.	CHECK AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT)

Pre-procedure1

(a) Connect the K68 air conditioning control assembly connector.

Procedure1

(b) Using an oscilloscope, check the waveform. Item Content Tester Connection K68-14 (LIN1) - Body ground Tool Setting 2 V/DIV., 20 μs/DIV. Condition Ignition switch ON OK: The waveform displays properly. Result: Proceed to OK NG

Post-procedure1

(c) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

Front Left Solar Sensor Circuit Short to Battery or Open (B14D215)

DESCRIPTION

The solar sensor (cooler thermistor) is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning control in AUTO mode.

The output voltage from the solar sensor (cooler thermistor) varies in accordance with the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases.

The air conditioning amplifier assembly detects changes in the output voltage from the solar sensor (cooler thermistor).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B14D215	Front Left Solar Sensor Circuit Short to Battery or Open	Diagnosis Condition: Ignition switch ON Malfunction: Short in solar sensor (cooler thermistor) circuit Detection Time: Continuously for 4 seconds or more	Solar sensor (cooler thermistor) Harness or connector Air conditioning amplifier assembly	Memorized	Air Conditioner	A

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Front Left Solar Sensor	Front left side solar sensor (cooler thermistor)	0 to 6553.5 W/m^2	Front left side solar sensor (cooler thermistor) value increases as brightness increases	Solar sensor (cooler thermistor) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Front Left Solar Sensor

OK:

The display is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.	INSPECT SOLAR SENSOR (COOLER THERMISTOR)

Click here

NG

REPLACE SOLAR SENSOR (COOLER THERMISTOR)

OK

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SOLAR SENSOR (COOLER THERMISTOR))

Pre-procedure1

(a) Disconnect the G2 solar sensor (cooler thermistor) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(G2,K73) Click Connector(G2) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
G2-1 (SS ) - K73-2 (S5-1)	Always	Below 1 Ω	Ω
G2-2 (SS-) - K73-9 (TS)	Always	Below 1 Ω	Ω
G2-1 (SS ) or K73-2 (S5-1) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
G2-2 (SS-) or K73-9 (TS) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(K73) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
K73-2 (S5-1) - Body ground	Ignition switch ON	Below 1 V	V
K73-9 (TS) - Body ground	Ignition switch ON	Below 1 V	V

Post-procedure1

(e) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Ambient Temperature Sensor Circuit Short to Ground (P007011)

DESCRIPTION

The ambient temp. sensor (thermistor assembly) is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the ambient temp. sensor (thermistor assembly) changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the ambient temp. sensor (thermistor assembly) and reads voltage changes due to changes in the resistance of the ambient temp. sensor (thermistor assembly).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
P007011	Ambient Temperature Sensor Circuit Short to Ground	Diagnosis Condition: Ignition switch ON Malfunction: Short (GND) in ambient temperature sensor circuit Detection Time: Continuously for 4 seconds or more	Ambient temp. sensor (Thermistor assembly) Harness or connector Air conditioning amplifier assembly	Memorized	Air Conditioner	A

WIRING DIAGRAM

w/o Grille Shutter System: w/ Grille Shutter System:

PROCEDURE

1.	READ VALUE USING GTS (AMBIENT TEMPERATURE SENSOR)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ambient Temperature Sensor	Ambient temp. sensor (thermistor assembly)	-327.68 to 327.67°C	Actual ambient temperature displayed	Ambient temp. sensor (thermistor assembly) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temperature Sensor

OK:

The display is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.	INSPECT AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY)

Click here

NG

REPLACE AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY)

OK

3.	CONFIRM MODEL

Result	Proceed to
w/o Grille Shutter System	A
w/ Grille Shutter System	B

B

GO TO STEP 5

A

4.	CHECK HARNESS AND CONNECTOR (AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

(a) Disconnect the A23 ambient temp. sensor (thermistor assembly) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A23,K73) Click Connector(A23) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A23-1 ( ) or K73-1 (TAM) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
A23-2 (-) or K73-14 (SG-2) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

(a) Disconnect the A28 ambient temp. sensor (thermistor assembly) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A28,K73) Click Connector(A28) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A28-1 ( ) or K73-1 (TAM) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
A28-2 (-) or K73-14 (SG-2) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Ambient Temperature Sensor Circuit Short to Battery or Open (P007015)

DESCRIPTION

The ambient temp. sensor (thermistor assembly) is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the ambient temp. sensor (thermistor assembly) changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the ambient temp. sensor (thermistor assembly) and reads voltage changes due to changes in the resistance of the ambient temp. sensor (thermistor assembly).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
P007015	Ambient Temperature Sensor Circuit Short to Battery or Open	Diagnosis Condition: Ignition switch ON Malfunction: Open or short ( B) in ambient temperature sensor circuit Detection Time: Continuously for 4 seconds or more	Ambient temp. sensor (Thermistor assembly) Harness or connector Air conditioning amplifier assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Open in ambient temperature sensor circuit	○	-
	Short ( B) in ambient temperature sensor circuit	-	○
Detection Time		Continuously for 4 seconds or more	Continuously for 4 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

w/o Grille Shutter System: w/ Grille Shutter System:

PROCEDURE

1.	READ VALUE USING GTS (AMBIENT TEMPERATURE SENSOR)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ambient Temperature Sensor	Ambient temp. sensor (thermistor assembly)	-327.68 to 327.67°C	Actual ambient temperature displayed	Ambient temp. sensor (thermistor assembly) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temperature Sensor

OK:

The display is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.	INSPECT AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY)

Click here

NG

REPLACE AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY)

OK

3.	CONFIRM MODEL

Result	Proceed to
w/o Grille Shutter System	A
w/ Grille Shutter System	B

B

GO TO STEP 5

A

4.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY))

Pre-procedure1

(a) Disconnect the A23 ambient temp. sensor (thermistor assembly) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A23,K73) Click Connector(A23) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A23-1 ( ) - K73-1 (TAM)	Always	Below 1 Ω	Ω
A23-2 (-) - K73-14 (SG-2)	Always	Below 1 Ω	Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(K73) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
K73-1 (TAM) - Body ground	Ignition switch ON	Below 1 V	V
K73-14 (SG-2) - Body ground	Ignition switch ON	Below 1 V	V

Post-procedure1

(e) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY))

Pre-procedure1

(a) Disconnect the A28 ambient temp. sensor (thermistor assembly) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A28,K73) Click Connector(A28) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A28-1 ( ) - K73-1 (TAM)	Always	Below 1 Ω	Ω
A28-2 (-) - K73-14 (SG-2)	Always	Below 1 Ω	Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(K73) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
K73-1 (TAM) - Body ground	Ignition switch ON	Below 1 V	V
K73-14 (SG-2) - Body ground	Ignition switch ON	Below 1 V	V

Post-procedure1

(e) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Refrigerant Pressure Sensor Circuit Short to Ground (P053011)

DESCRIPTION

The air conditioning pressure sensor, which is installed to the high pressure side pipe to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly converts this signal to a pressure value according to the sensor characteristics and uses it to control the compressor.

This DTC is stored if refrigerant pressure on the high pressure side is extremely low.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
P053011	Refrigerant Pressure Sensor Circuit Short to Ground	Diagnosis Condition: Ignition switch ON Malfunction: Short (GND) in air conditioning pressure sensor circuit Detection Time: Continuously for 4 seconds or more	Refrigerant volume Air conditioning pressure sensor Harness or connector Air conditioning amplifier assembly	Memorized	Air Conditioner	A

WIRING DIAGRAM

PROCEDURE

1.	CHECK COMPARE REFRIGERANT GAS PRESSURE VALUES SHOWN ON GTS AND MANIFOLD GAUGE SET

Pre-procedure1

(a) Install a manifold gauge set.

HINT:

for HFC-134a(R134a): Click here

for HFO-1234yf(R1234yf): Click here

Procedure1

(b) Compare the values displayed in the Data List and on the manifold gauge.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Regulator Pressure Sensor	Air conditioning pressure sensor	-32.768 to 32.767 MPaG	Actual refrigerant pressure displayed	Refrigerant line (gas leak etc.) Air conditioning pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

Result	Proceed to
Data List value and manifold gauge set value do not match	A
Data List value matches manifold gauge set value	B

Post-procedure1

(c) None

B

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

A

2.	READ VALUE USING GTS (REGULATOR PRESSURE SENSOR)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Regulator Pressure Sensor	Air conditioning pressure sensor	-32.768 to 32.767 MPaG	Actual refrigerant pressure displayed	Refrigerant line (gas leak etc.) Air conditioning pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

OK:

Disconnecting the A58 connector of the air conditioning pressure sensor causes the Data List value to change.

Result	Proceed to
Regulator pressure sensor value changes	A
Regulator pressure sensor value does not change	B

B

GO TO STEP 5

A

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - POWER SOURCE)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: Click Location & Routing(A58) Click Connector(A58) Tester Connection Condition Specified Condition Result A58-3 ( ) - Body ground Ignition switch ON 4.75 to 5.25 V V Result: Proceed to OK NG

*a Front view of wire harness connector (to Air Conditioning Pressure Sensor)

Post-procedure1

(c) None

OK

REPLACE AIR CONDITIONING PRESSURE SENSOR

NG

4.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING PRESSURE SENSOR)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-3 ( ) - K73-11 (S5-3)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - BODY GROUND)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: Click Location & Routing(A58) Click Connector(A58) Tester Connection Condition Specified Condition Result A58-2 (PR) - Body ground Ignition switch ON 3.0 to 5.25 V V Result: Proceed to OK NG

*a Front view of wire harness connector (to Air Conditioning Pressure Sensor)

Post-procedure1

(c) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

6.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-2 (PR) or K73-6 (PRE) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Refrigerant Pressure Sensor Circuit Short to Battery or Open (P053015)

DESCRIPTION

The air conditioning pressure sensor, which is installed to the high pressure side pipe to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly converts this signal to a pressure value according to the sensor characteristics and uses it to control the compressor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
P053015	Refrigerant Pressure Sensor Circuit Short to Battery or Open	Diagnosis Condition: Ignition switch ON Malfunction: Open or short ( B) in air conditioning pressure sensor circuit Detection Time: Continuously for 4 seconds or more	Air conditioning pressure sensor Harness or connector Air conditioning amplifier assembly	Memorized	Air Conditioner	A

DTC Detection Condition Combination Table

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Open in air conditioning pressure sensor circuit	○	-
	Short ( B) in air conditioning pressure sensor circuit	-	○
Detection Time		Continuously for 4 seconds or more	Continuously for 4 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If DTC P05347A is output at the same time, perform troubleshooting for DTC P05347A first.

Click here

HINT:

If a connector is disconnected or not installed correctly, securely connect it and check for DTCs.

PROCEDURE

1.	CHECK COMPARE REFRIGERANT GAS PRESSURE VALUES SHOWN ON GTS AND MANIFOLD GAUGE SET

Pre-procedure1

(a) Install a manifold gauge set.

HINT:

for HFC-134a(R134a): Click here

for HFO-1234yf(R1234yf): Click here

Procedure1

(b) Compare the values displayed in the Data List and on the manifold gauge.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Regulator Pressure Sensor	Air conditioning pressure sensor	-32.768 to 32.767 MPaG	Actual refrigerant pressure displayed	Refrigerant line (gas leak etc.) Air conditioning pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

Result	Proceed to
Data List value and manifold gauge set value do not match	A
Data List value matches manifold gauge set value	B

Post-procedure1

(c) None

B

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

A

2.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - BODY GROUND)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Click Location & Routing(A58) Click Connector(A58) Tester Connection Condition Specified Condition Result A58-1 (-) - Body ground Always Below 1 Ω Ω Result: Proceed to OK NG

*a Front view of wire harness connector (to Air Conditioning Pressure Sensor)

Post-procedure1

(c) None

NG

GO TO STEP 8

OK

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - BODY GROUND)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: Click Location & Routing(A58) Click Connector(A58) Tester Connection Condition Specified Condition Result A58-2 (PR) - Body ground Ignition switch ON 3.0 to 5.25 V V Result: Result Proceed to A58-2 (PR) - Body ground is more than 5.25 V A A58-2 (PR) - Body ground is more than or equal to 3.0 and less than or equal to 5.25 V B A58-2 (PR) - Body ground is less than 3.0 V C

*a Front view of wire harness connector (to Air Conditioning Pressure Sensor)

Post-procedure1

(c) None

B

GO TO STEP 5

C

GO TO STEP 7

A

4.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING PRESSURE SENSOR)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-2 (PR) or K73-6 (PRE) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (INTERNAL CIRCUIT RESISTANCE)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Click Location & Routing(A58) Click Connector(A58) Tester Connection Condition Specified Condition Result A58-3 ( ) - A58-2 (PR) Ignition switch off 180 to 220 kΩ kΩ HINT: After turning the ignition switch off, wait at least 30 seconds before performing the measurement. Result: Proceed to OK NG

*a Front view of wire harness connector (to Air Conditioning Pressure Sensor)

Post-procedure1

(c) None

OK

REPLACE AIR CONDITIONING PRESSURE SENSOR

NG

6.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-2 (PR) - A58-3 ( )	Always	10 kΩ or higher	kΩ
K73-6 (PRE) - K73-11 (S5-3)	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING PRESSURE SENSOR)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-2 (PR) - K73-6 (PRE)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING PRESSURE SENSOR)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-1 (-) - K73-15 (SG-4)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Refrigerant Gas Fluid Leak or Seal Failure (P05347A)

DESCRIPTION

This DTC is stored if the amount of refrigerant in the air conditioning system is insufficient.

The air conditioning amplifier assembly receives the ambient temperature signal, refrigerant pressure signal, etc. from various sensors.

Based on these signals, the air conditioning amplifier assembly detects the amount of refrigerant.

The A/C switch indicator is turned off and the air conditioning system is stopped if the amount of refrigerant is insufficient.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
P05347A	Refrigerant Gas Fluid Leak or Seal Failure	Diagnosis Condition: Normal operation refrigerant amount check conditions are met. The following condition is detected in the normal operation refrigerant shortage check Malfunction: Amount of refrigerant is judged to be insufficient by normal operation refrigerant amount check. Amount of refrigerant is insufficient Detection Time: Air conditioning system operating time: 15 minutes or more	Refrigerant volume Air conditioning pressure sensor Harness or connector Air conditioning amplifier assembly	Memorized	Air Conditioner	A

WIRING DIAGRAM

PROCEDURE

1.	CHECK REFRIGERANT PRESSURE

Pre-procedure1

(a) Install a manifold gauge set.

HINT:

for HFC-134a(R134a): Click here

for HFO-1234yf(R1234yf): Click here

(b) Prepare the Toyota Prius vehicle according to the table below.

Measurement Condition:

Item	Condition
Doors	Fully open
A/C Switch	On
Recirculation/fresh Control Switch	Recirculation
Set Temperature	MAX COLD
Blower Speed	HI
Air Conditioning Air Inlet Temperature	25 to 35°C (77 to 95°F)

Procedure1

(c) Compare the values displayed in the Data List and on the manifold gauge.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Regulator Pressure Sensor	Air conditioning pressure sensor	-32.768 to 32.767 MPaG	Actual refrigerant pressure displayed	Refrigerant line (gas leak etc.) Air conditioning pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

Result	Proceed to
Data List value and manifold gauge set value do not match	A
Data List value matches manifold gauge set value	B

Post-procedure1

(d) None

B

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

A

2.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - POWER SOURCE)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: Click Location & Routing(A58) Click Connector(A58) Tester Connection Condition Specified Condition Result A58-3 ( ) - Body ground Ignition switch ON 4.75 to 5.25 V V Result: Proceed to OK NG

*a Front view of wire harness connector (to Air Conditioner Pressure Sensor)

Post-procedure1

(c) None

NG

GO TO STEP 7

OK

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - BODY GROUND)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Click Location & Routing(A58) Click Connector(A58) Tester Connection Condition Specified Condition Result A58-1 (-) - Body ground Always Below 1 Ω Ω Result: Proceed to OK NG

*a Front view of wire harness connector (to Air Conditioner Pressure Sensor)

Post-procedure1

(c) None

NG

GO TO STEP 6

OK

4.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-2 (PR) - K73-6 (PRE)	Always	Below 1 Ω	Ω
A58-2 (PR) or K73-6 (PRE) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY (SENSOR SIGNAL CIRCUIT)

HINT:

When the outside air temperature is low (below -1.5°C (29.3°F)), the compressor stops due to operation of the ambient temp. sensor (thermistor assembly) and the evaporator temp. sensor (No. 1 cooler thermistor) to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.

Pre-procedure1

(a) Connect the K73 air conditioning amplifier assembly connector.

(b) Connect the A58 air conditioning pressure sensor connector.

(c) Prepare the Toyota Prius vehicle according to the table below.

Measurement Condition:

Item	Condition
Doors	Fully open
A/C Switch	On
Recirculation/fresh Control Switch	Recirculation
Set Temperature	MAX COLD
Blower Speed	HI
Air Conditioning Air Inlet Temperature	25 to 35°C (77 to 95°F)

Procedure1

(d) Measure the voltage according to the value(s) in the table below.

for Type A:

*a

Component with harness connected (Air Conditioning Amplifier Assembly)

-

-

for Type B:

*a

Component with harness connected (Air Conditioning Amplifier Assembly)

-

-

Standard Voltage:

Click Location & Routing(K73) Click Connector(K73)

Tester Connection	Condition	Specified Condition
K73-6 (PRE) - Body ground	A/C Switch ON (When compressor with motor assembly running)	0.74 to 4.61 V

(e) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Regulator Pressure Sensor	Air conditioning pressure sensor	-32.768 to 32.767 MPaG	Actual refrigerant pressure displayed	Refrigerant line (gas leak etc.) Air conditioning pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

OK:

The voltage and value displayed in the Data List change.

Result	Proceed to
OK	A
NG (The voltage changes but the value displayed in the Data List does not change.)	B
NG (The voltage does not change.)	C

Post-procedure1

(f) None

A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

C

REPLACE AIR CONDITIONING PRESSURE SENSOR

6.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-1 (-) - K73-15 (SG-4)	Always	Below 1 Ω	Ω
A58-1 (-) or K73-15 (SG-4) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

(a) Disconnect the A58 air conditioning pressure sensor connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

Procedure1

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A58,K73) Click Connector(A58) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
A58-3 ( ) - K73-11 (S5 -3)	Always	Below 1 Ω	Ω
A58-3 ( ) or K73-11 (S5 -3) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Evaporator Temperature Sensor Circuit Short to Ground (P053511)

DESCRIPTION

The evaporator temp. sensor (No. 1 cooler thermistor) is installed to the evaporator in the air conditioner unit to detect the temperature of the cooled air that has passed through the evaporator, which is used to control the air conditioning system. It sends signals to the air conditioning amplifier assembly. The resistance of the evaporator temp. sensor (No. 1 cooler thermistor) changes in accordance with the temperature of the cooled air that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the evaporator temp. sensor (No. 1 cooler thermistor) and reads voltage changes as the resistance of the evaporator temp. sensor (No. 1 cooler thermistor) changes. This sensor is used for frost prevention.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
P053511	Evaporator Temperature Sensor Circuit Short to Ground	Diagnosis Condition: Ignition switch ON Malfunction: Short (GND) in evaporator temperature sensor circuit Detection Time: Continuously for 4 seconds or more	Evaporator temp. sensor (No. 1 cooler thermistor) Air conditioning harness assembly Air conditioning amplifier assembly	Memorized	Air Conditioner	A

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Evaporator Fin Thermistor	Evaporator temp. sensor (No. 1 cooler thermistor)	-327.68 to 327.67°C	Actual evaporator temperature displayed	Evaporator temp. sensor (No. 1 cooler thermistor) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Evaporator Fin Thermistor

OK:

The display is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.	INSPECT EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR)

Click here

NG

REPLACE EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR)

OK

3.	INSPECT AIR CONDITIONING HARNESS ASSEMBLY (EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

(a) Remove the air conditioning harness assembly.

HINT:

Click here

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

*a

Front view of air conditioning harness assembly connector (to Air Conditioning Amplifier Assembly)

*b

Front view of air conditioning harness assembly connector (to Evaporator Temp. Sensor (No. 1 Cooler Thermistor))

Standard Resistance:

Click Location & Routing(n2,n3) Click Connector(n2) Click Connector(n3)

Tester Connection	Condition	Specified Condition	Result
n2-2 or n3-6 (TE) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
n2-1 or n3-5 (SG-3) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(c) None

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Lost Communication with ECM/PCM "A" Missing Message (U010087,U013187,U014087,U015587,U016387,U019887,U029387)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
U010087	Lost Communication with ECM/PCM "A" Missing Message	Diagnosis Condition: IG voltage is 8.5 V or more. Malfunction: No communication with ECM Detection Time: Continuously for 10 seconds or more	CAN communication system ECM Air conditioning amplifier assembly	Memorized	Air Conditioner	B
U013187	Lost Communication with Power Steering Control Module Missing Message	Diagnosis Condition: IG voltage is 8.5 V or more. Malfunction: No communication with power steering ECU assembly Detection Time: Continuously for 10 seconds or more	CAN communication system Power steering ECU assembly Air conditioning amplifier assembly	Memorized	Air Conditioner	B
U014087	Lost Communication with Body Control Module Missing Message	Diagnosis Condition: IG voltage is 8.5 V or more. Malfunction: No communication with main body ECU (multiplex network body ECU) Detection Time: Continuously for 10 seconds or more	CAN communication system Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly	Memorized	Air Conditioner	B
U015587	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Diagnosis Condition: IG voltage is 8.5 V or more. Malfunction: No communication with combination meter assembly Detection Time: Continuously for 10 seconds or more	CAN communication system Combination meter assembly Air conditioning amplifier assembly	Memorized	Air Conditioner	B
U016387	Lost Communication with Navigation Control Module Missing Message	Diagnosis Condition: IG voltage is 8.5 V or more. Malfunction: No communication with radio and display receiver assembly Detection Time: Continuously for 10 seconds or more	CAN communication system Radio and display receiver assembly Air conditioning amplifier assembly	Memorized	Air Conditioner	B
U019887	Lost Communication with Telematic Control Module "A" Missing Message	Diagnosis Condition: IG voltage 8.5 V or higher Malfunction Status: No communication with DCM (telematics transceiver) Detection Time: Continuously for 10 seconds or more	CAN communication system DCM (telematics transceiver) Air conditioning amplifier assembly	Memorized	Air Conditioner	B
U029387	Lost Communication with Hybrid Powertrain Control Module Missing Message	Diagnosis Condition: IG voltage is 8.5 V or more. Malfunction: No communication with hybrid Toyota Prius vehicle control ECU Detection Time: Continuously for 10 seconds or more	CAN communication system Hybrid vehicle control ECU Air conditioning amplifier assembly	Memorized	Air Conditioner	B

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

HINT:

If CAN communication DTCs are output, refer to How to Proceed with Troubleshooting for the CAN communication system.

Click here

NEXT

END

Blower Motor Circuit

DESCRIPTION

The blower motor with fan sub-assembly is operated by signals from the air conditioning amplifier assembly.

If the airflow volume is low or the blower speed cannot be changed, the following factors may be the cause.

Symptom	Factor
Airflow volume cannot be changed	Air conditioning amplifier assembly malfunction Blower motor with fan sub-assembly malfunction Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Blower Level	This test activates the Blower Motor to adjust the air volume High/Low. (Blower motor with fan sub-assembly)	0: Air Volume Low 31: Air Volume High	Operate with ignition switch ON.

Body Electrical > Air Conditioner > Active Test

Tester Display
Blower Level

Result	Proceed to
Blower motor with fan sub-assembly does not operate	A
Blower motor with fan sub-assembly operates but does not change speed	B

B

GO TO STEP 5

A

2.	CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

(a) Disconnect the A32 blower motor with fan sub-assembly connector.

*a Rear view of wire harness connector (to Blower Motor with Fan Sub-assembly)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A32) Click Connector(A32)

Tester Connection	Condition	Specified Condition
A32-1 (GND) - Body ground	Always	Below 1 Ω

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(A32) Click Connector(A32)

Tester Connection	Condition	Specified Condition
A32-3 ( B) - Body ground	Ignition switch off	11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BLOWER MOTOR WITH FAN SUB-ASSEMBLY)

(a) Disconnect the K74 air conditioning amplifier assembly connector.

(b) Disconnect the A32 blower motor with fan sub-assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(K74,A32) Click Connector(K74) Click Connector(A32)

Tester Connection	Condition	Specified Condition
K74-21 (BLW) - A32-2 (SI)	Always	Below 1 Ω
K74-21 (BLW) or A32-2 (SI) - Other terminals and body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	CHECK BLOWER MOTOR WITH FAN SUB-ASSEMBLY

(a) Connect the A32 blower motor with fan sub-assembly connector.

(b) Disconnect the K74 air conditioning amplifier assembly connector.

*a Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(K74) Click Connector(K74)

Tester Connection	Condition	Specified Condition
K74-21 (BLW) - Body ground	Always	4.75 to 5.25 V

NG

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

OK

5.	CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Connect the K74 air conditioning amplifier assembly connector.

(b) Using an oscilloscope, check the waveform.

for Type A:

*a

Component with harness connected (Air Conditioning Amplifier Assembly)

-

-

for Type B:

*a

Component with harness connected (Air Conditioning Amplifier Assembly)

-

-

Item	Content
Terminal No.	K74-21 (BLW) - K74-17 (GND)
Tool Setting	2 V/DIV., 1 ms./DIV.
Condition	Ignition switch ON Blower speed: LO

HINT:

The waveform varies with the blower speed.

OK:

Waveform is similar to that shown in the illustration.

OK

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Ambient Temperature Display System

DESCRIPTION

The ambient temp. sensor (thermistor assembly) is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system.

The ambient temp. sensor (thermistor assembly) detects fluctuations in the ambient temperature and sends it as a signal to the combination meter assembly.

This data is used for controlling the cabin temperature.

The resistance of the ambient temp. sensor (thermistor assembly) changes in accordance with the ambient temperature.

As the temperature decreases, the resistance increases.

As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the ambient temp. sensor (thermistor assembly) and detects voltage changes due to changes in the resistance of the ambient temp. sensor (thermistor assembly).

NOTICE:

The ambient temp. sensor (thermistor assembly) detects the ambient temperature in its vicinity, not the ambient temperature around the Toyota Prius vehicle.

Depending on factors such as radiant heat from the engine room and the vehicle speed, the ambient temperature detected by the ambient temp. sensor (thermistor assembly) may differ from the ambient temperature displayed on the multi-information display in the combination meter assembly.

For example:

WIRING DIAGRAM

w/o Grille Shutter System: w/ Grille Shutter System:

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTC P007011 and P007015 are not output	A
DTC P007011 is output	B
DTC P007015 is output	C

B

GO TO DTC P007011

C

GO TO DTC P007015

A

2.	INSPECT AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY)

Click here

NG

REPLACE AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY)

OK

3.	CONFIRM MODEL

Result	Proceed to
w/o Grille Shutter System	A
w/ Grille Shutter System	B

B

GO TO STEP 7

A

4.	CHECK HARNESS AND CONNECTOR (AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NOTICE:

During the parked Toyota Prius vehicle inspection, perform the inspection with the ignition switch off (do not start the engine and electric motor).

(a) Disconnect the A23 ambient temp. sensor (thermistor assembly) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A23,K73) Click Connector(A23) Click Connector(K73)

Tester Connection	Condition	Specified Condition
A23-1 ( ) - K73-1 (TAM)	Always	Below 1 Ω
A23-2 (-) - K73-14 (SG-2)	Always	Below 1 Ω
A23-1 ( ) or K73-1 (TAM) - Other terminals and body ground	Always	10 kΩ or higher
A23-2 (-) or K73-14 (SG-2) - Other terminals and body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	CLEAR ECU STORED VALUES (THERMISTOR ASSEMBLY DETECTION VALUE)

HINT:

The air conditioning amplifier assembly reads and memorizes the ambient temp. sensor (thermistor assembly) detection value (THO) from before the ignition switch was turned off for 1 hour after turning the ignition switch off. Therefore, it is necessary to switch off the air conditioning amplifier assembly internal power source and clear the stored values from before the ignition switch was turned off.

(a) Turn the ignition switch off and wait for 6 minutes or more.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

(c) Connect the cable to the negative (-) auxiliary battery terminal.

NEXT

6.	CHECK VALUE OF AMBIENT TEMPERATURE DETECTED BY AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY)

NOTICE:

Perform the following procedure with the ignition switch ON. (Do not turn the ignition switch to ON (READY).)

(a) Turn the ignition switch to ON and wait for 6 minutes or more.

NOTICE:

Wait at least 6 minutes for the values of the ambient temp. sensor (thermistor assembly) and thermometer to become stable before taking a measurement.

(b) Measure and make a note of the ambient temperature near the ambient temp. sensor (thermistor assembly) using a thermometer.

(c) Make a note of the ambient temperature displayed on the multi-information display in the combination meter assembly.

(d) Compare the values of the ambient temperature measured by the thermometer and the ambient temp. sensor (thermistor assembly).

OK:

The values of the ambient temperature measured by the thermometer and the ambient temp. sensor (thermistor assembly) are almost the same.

OK

END

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NOTICE:

During the parked Toyota Prius vehicle inspection, perform the inspection with the ignition switch off (do not start the engine and electric motor).

(a) Disconnect the A28 ambient temp. sensor (thermistor assembly) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A28,K73) Click Connector(A28) Click Connector(K73)

Tester Connection	Condition	Specified Condition
A28-1 ( ) - K73-1 (TAM)	Always	Below 1 Ω
A28-2 (-) - K73-14 (SG-2)	Always	Below 1 Ω
A28-1 ( ) or K73-1 (TAM) - Other terminals and body ground	Always	10 kΩ or higher
A28-2 (-) or K73-14 (SG-2) - Other terminals and body ground	Always	10 kΩ or higher

OK

GO TO STEP 5

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

A/C Switch Indicator does not Turn On

DESCRIPTION

If none of the switch indicators on the air conditioning control assembly illuminate, the following factors may be the cause.

Malfunction Status	Factor
A/C switch indicator does not illuminate	Air conditioning amplifier assembly malfunction Air conditioning control assembly malfunction Servo motor initialization (incomplete) Mechanical locking of damper and damper link Refrigerant pressure is extremely low Low detected ambient temperature (including thermistor assembly malfunction)

PROCEDURE

1.	CHECK MALFUNCTION STATUS

(a) Check the malfunction status of switch indicators on the air conditioning control assembly.

Result	Proceed to
A/C switch indicators are not always illuminated	A
A/C switch indicators are not illuminated only immediately after starting the hybrid control system	B

B

GO TO INITIALIZATION

A

2.	READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ambient Temperature Sensor	Ambient temp. sensor (thermistor assembly)	-327.68 to 327.67°C	Actual ambient temperature displayed	Ambient temp. sensor (thermistor assembly) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temperature Sensor

OK:

The display is as specified in the normal condition column (0°C (32°F) or higher).

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Ambient Temperature Display System)

No Cooling at All

DESCRIPTION

If cool air is not discharged (air is discharged), the following malfunctions are possible.

Malfunction Status	Factor
Cool air is not discharged (air is discharged)	Compressor with motor assembly malfunction Refrigerant pressure malfunction Lack of refrigerant gas Dirty cooler condenser Cooling fan system malfunction Air mix damper and link operation (jamming) Evaporator temperature sensor (determined as cold, but conflicts with actual temperature) Warm air flow

PROCEDURE

1.	CHECK SWITCH INDICATOR

(a) Operate each switch on the air conditioning control assembly and check that the switch indicators operate normally.

OK:

All switch indicators operate normally.

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Operation not Accepted Even If Air Conditioning Switch is Operated)

OK

2.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Front Air Mix Damper Control Servo Motor	This test activates the Front Air Mix Damper Control Servo Motor. (No. 1 air conditioning radiator damper servo sub-assembly (air mix))	128: Min 384: Max	Operate with ignition switch ON.

Body Electrical > Air Conditioner > Active Test

Active Test Display
Front Air Mix Damper Control Servo Motor

Data List Display
Front Air Mix Damper Control Servo Motor Actual Pulse

OK:

Damper servo motor is operated.

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION)

Cooling is Poor

DESCRIPTION

If the cooling effect of the air conditioning system is weak, the following factors may be the cause.

Symptom

Factor

Cooling effectiveness is poor Cooling response is slow

ECO mode control of air conditioning system is enabled Compressor with motor assembly malfunction Refrigerant volume (high) Refrigerant volume (low) Clogged cooler condenser assembly fins Cooling fan system malfunction Mechanical locking of damper and damper link Solar sensor (cooler thermistor) malfunction*1 Solar sensor (automatic light control sensor) malfunction*2 High inlet air temperature Harness or connector

WIRING DIAGRAM

w/o Automatic Light Control: w/ Automatic Light Control:

CAUTION / NOTICE / HINT

NOTICE:

When disconnecting a wire harness of any component connected to the supply power of the integrated capacitor (integration control supply) or when removing the integrated capacitor (integration control supply), make sure to wait 5 minutes or more after turning the ignition switch off for self-diagnosis to complete and the voltage of the integrated capacitor (integration control supply) to discharge.

PROCEDURE

1.	CHECK ECO MODE SETTING

(a) Confirm that ECO HEAT/COOL switch is set to off.

(b) Confirm that ECO drive mode is set to off.

HINT:

When the ECO drive mode is set to ON, the air conditioning amplifier assembly performs minimal air conditioning control in order to promote the improvement of fuel economy. Ensure that the customer understands that the airflow volume will be decreased compared to normal operation.

Control	Control Summary
Air Volume Control	Sets the blower level to less.

NEXT

2.	CHECK REFRIGERANT SHORTAGE

(a) Prepare the Toyota Prius vehicle according to the table below.

Measurement Condition:

Item	Condition
A/C Switch	On
Ambient Temperature*1	0 to 49°C (32 to 120°F)
Air Conditioning Air Inlet Temperature*2	25 to 35°C (77 to 95°F)
Set Temperature	MAX COLD
Recirculation/fresh Control Switch	Recirculation
Air Vent Damper Position	FACE
Blower Speed	HI

HINT:

*1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.

*2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.

(b) Using the GTS, check the amount of refrigerant.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

NOTICE:

If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.

Result	Amount of Refrigerant
Refrigerant shortage	Insufficient or leakage
Refrigerant correct	Correct
Refrigerant incorrect	Incorrect

OK:

"Refrigerant correct" is displayed on the GTS.

NG

CHARGE SYSTEM WITH REFRIGERANT for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

OK

3.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Front Air Mix Damper Control Servo Motor	This test activates the Front Air Mix Damper Control Servo Motor. (No. 1 air conditioning radiator damper servo sub-assembly (air mix))	128: Min 384: Max	Operate with ignition switch ON.

Body Electrical > Air Conditioner > Active Test

Active Test Display
Front Air Mix Damper Control Servo Motor

Data List Display
Front Air Mix Damper Control Servo Motor Actual Pulse

OK:

Damper servo motor is operated.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION)

OK

4.	CONFIRM MODEL

Result	Proceed to
w/o Automatic Light Control	A
w/ Automatic Light Control	B

B

GO TO STEP 7

A

5.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SOLAR SENSOR (COOLER THERMISTOR))

(a) Disconnect the G2 solar sensor (cooler thermistor) connector.

(b) Disconnect the K73 air conditioning amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(G2,K73) Click Connector(G2) Click Connector(K73)

Tester Connection	Condition	Specified Condition
G2-1 (SS ) - K73-2 (S5-1)	Always	Below 1 Ω
G2-2 (SS-) - K73-9 (TS)	Always	Below 1 Ω
G2-1 (SS ) or K73-2 (S5-1) - Other terminals and body ground	Always	10 kΩ or higher
G2-2 (SS-) or K73-9 (TS) - Other terminals and body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.	INSPECT SOLAR SENSOR (COOLER THERMISTOR)

Click here

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

NG

REPLACE SOLAR SENSOR (COOLER THERMISTOR)

7.	CHECK HARNESS AND CONNECTOR (SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the G1 solar sensor (automatic light control sensor) connector.

(b) Disconnect the K17 main body ECU (multiplex network body ECU) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(G1,K17) Click Connector(G1) Click Connector(K17)

Tester Connection	Condition	Specified Condition
G1-1 (CLTB) - K17-8 (CLTB)	Always	Below 1 Ω
G1-2 (CLTE) - K17-21 (CLTE)	Always	Below 1 Ω
G1-4 (CLTS) - K17-20 (CLTS)	Always	Below 1 Ω
G1-1 (CLTB) or K17-8 (CLTB) - Other terminals and body ground	Always	10 kΩ or higher
G1-2 (CLTE) or K17-21 (CLTE) - Other terminals and body ground	Always	10 kΩ or higher
G1-4 (CLTS) or K17-20 (CLTS) - Other terminals and body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.	INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)

Click here

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

NG

REPLACE SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)

No Heating at All

DESCRIPTION

If cool air blows from the registers regardless of the temperature setting of the air conditioning system, the following factors may be the cause.

Symptom	Factor
No warm air comes out (Blower control is normal) Outlet air temperature does not increase (Blower control is normal)	Engine coolant temperature (low) Air mix damper and link operation (jamming) Warm-up control Blockage in heater radiator unit sub-assembly Heater radiator unit sub-assembly malfunction

PROCEDURE

1.	READ VALUE USING GTS (COOLANT TEMPERATURE)

(a) Read the Data List according to the display on the GTS.

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature	Min.: -40°C (-40°F) Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	This is the engine coolant temperature. HINT: After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal. If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted. Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

The value of the display does not change frequently.

NG

GO TO COOLING SYSTEM for M20A-FXS: Click here for 2ZR-FXE: Click here

OK

2.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Front Air Mix Damper Control Servo Motor	This test activates the Front Air Mix Damper Control Servo Motor. (No. 1 air conditioning radiator damper servo sub-assembly (air mix))	128: Min 384: Max	Operate with ignition switch ON.

Body Electrical > Air Conditioner > Active Test

Active Test Display
Front Air Mix Damper Control Servo Motor

Data List Display
Front Air Mix Damper Control Servo Motor Actual Pulse

OK:

Damper servo motor is operated.

OK

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION)

Operation not Accepted Even If Air Conditioning Switch is Operated

DESCRIPTION

If the air conditioning system cannot be operated using the air conditioning control assembly, the following factors may be the cause.

Symptom	Factor
Air conditioning system cannot be operated using air conditioning control assembly (With the exception of the switch indicators, no inputs are reflected when other switches operated)	LIN communication malfunction between air conditioning amplifier assembly and air conditioning control assembly Short to B or ground in air conditioning amplifier assembly circuit Air conditioning amplifier assembly malfunction air conditioning control assembly malfunction Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTC.

Body Electrical > Air Conditioner > Clear DTCs

(b) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B14B287 is not output	A
B14B287 is output	B

B

GO TO DTC B14B287

A

2.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AUXILIARY BATTERY)

(a) Disconnect the K74 air conditioning amplifier assembly connector.

*a Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(K74) Click Connector(K74)

Tester Connection	Condition	Specified Condition
K74-5 (B) - Body ground	Ignition switch off	11 to 14 V
K74-6 (IG ) - Body ground	Ignition switch ON	11 to 14 V
	Ignition switch off	Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BODY GROUND)

(a) Disconnect the K74 air conditioning amplifier assembly connector.

*a Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(K74) Click Connector(K74)

Tester Connection	Condition	Specified Condition
K74-17 (GND) - Body ground	Always	Below 1 Ω

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Front Window Fogging

DESCRIPTION

If the windshield frequently fogs up even though the air conditioning system is operating, the following factors may be the cause.

Symptom	Factor
Windshield frequently fogs up	Compressor with motor assembly malfunction Refrigerant volume (low) Cooler expansion valve (opened excessively) Damper servo malfunction Mechanical locking of damper and damper link

PROCEDURE

1.	CHECK REFRIGERANT SHORTAGE

(a) Prepare the Toyota Prius vehicle according to the table below.

Measurement Condition:

Item	Condition
A/C Switch	On
Ambient Temperature*1	0 to 49°C (32 to 120°F)
Air Conditioning Air Inlet Temperature*2	25 to 35°C (77 to 95°F)
Set Temperature	MAX COLD
Recirculation/fresh Control Switch	Recirculation
Air Vent Damper Position	FACE
Blower Speed	HI

HINT:

*1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.

*2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.

(b) Using the GTS, check the amount of refrigerant.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

NOTICE:

If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.

Result	Amount of Refrigerant
Refrigerant shortage	Insufficient or leakage
Refrigerant correct	Correct
Refrigerant incorrect	Incorrect

OK:

"Refrigerant correct" is displayed on the GTS.

NG

CHARGE SYSTEM WITH REFRIGERANT for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

OK

2.	CHECK OPERATION

(a) Check that the air conditioning system changes to DEF mode according to the switch operation, when the MODE switch on the radio and display receiver assembly is pushed.

OK:

Air conditioning system changes to DEF mode.

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

NG

GO TO DTC B14037F

Blower Motor does not Operate

DESCRIPTION

If air does not flow from the registers after the blower switch on the air conditioning control assembly is operated, the following factors may be the cause.

Symptom	Factor
No air flows from the registers	Blower motor with fan sub-assembly malfunction Air conditioning amplifier assembly malfunction Warm-up control Engine coolant temperature sensor malfunction

PROCEDURE

1.	CHECK AIR CONDITIONING SYSTEM (MANUAL MODE)

(a) Turn off the AUTO switch, operate the blower switch and check that the blower motor with fan sub-assembly can be operated manually.

OK:

The blower motor with fan sub-assembly operates normally.

NG

GO TO DIAGNOSIS PROCEDURE (Blower Motor Circuit)

OK

2.	READ VALUE USING GTS (COOLANT TEMPERATURE)

(a) Read the Data List according to the display on the GTS.

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature	Min.: -40°C (-40°F) Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	This is the engine coolant temperature. HINT: After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal. If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted. Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

The temperature after warming up is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

GO TO COOLING SYSTEM for M20A-FXS: Click here for 2ZR-FXE: Click here

Weak Blower Output

DESCRIPTION

If the airflow from the registers is weak regardless of the blower speed setting displayed on the air conditioning control assembly, the following factors may be the cause.

Symptom	Factor
Airflow volume is constantly low Airflow volume sometimes becomes low	ECO mode control of air conditioning system is enabled Blower motor with fan sub-assembly malfunction Clogged clean air filter Clogged No. 1 cooler evaporator sub-assembly or heater radiator unit sub-assembly fins Evaporator temp. sensor (No. 1 cooler thermistor) not connected properly Aspirator pipe not connected properly

PROCEDURE

1.	CHECK AIR CONDITIONING SYSTEM

(a) Operate the blower switch with the following conditions met and check that the airflow volume changes.

Blower Speed	Condition
LO → HI	Temperature setting: MAX COLD Air outlet mode: FACE A/C switch: Off

OK:

Airflow volume increases.

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Blower Motor Circuit)

OK

2.	CHECK ECO MODE SETTING

(a) Confirm that ECO HEAT/COOL switch is set to off.

(b) Confirm that ECO drive mode is set to off.

HINT:

When the ECO drive mode is set to ON, the air conditioning amplifier assembly performs minimal air conditioning control in order to promote the improvement of fuel economy. Ensure that the customer understands that the airflow volume will be decreased compared to normal operation.

Control	Control Summary
Air Volume Control	Sets the blower level to less.

NEXT

3.	CHECK CLEAN AIR FILTER

(a) Visually check the clean air filter.

OK:

The clean air filter is not dirty or clogging.

NG

REPLACE CLEAN AIR FILTER

OK

4.	CHECK EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR)

(a) Check the installation condition of the evaporator temp. sensor (No. 1 cooler thermistor).

OK:

Evaporator temp. sensor (No. 1 cooler thermistor) is installed correctly.

NG

REINSTALL EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR)

OK

5.	CHECK ASPIRATOR PIPE

(a) Check the installation condition of the aspirator pipe.

OK:

The aspirator pipe is installed correctly.

OK

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY OR NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY

NG

INSTALL ASPIRATOR PIPE

Recirculated/Fresh Air Modes Switch without User Input

DESCRIPTION

If recirculation/fresh mode changes unintentionally and without permission, the following causes are possible.

Symptom	Factor
*: for Mexico
Recirculation/fresh mode changes without permission Recirculation/fresh mode light blinks	Customize setting* Change in ambient air temperature Decrease in refrigerant pressure Air conditioning pressure sensor circuit malfunction Engine coolant temperature (high)

PROCEDURE

1.	CONFIRM MODEL

Result	Proceed to
for Mexico	A
except Mexico	B

B

GO TO STEP 3

A

2.	READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Efficient Ventilation Mode	Function to automatically change ambient air induction and room circulation is set.	OFF / ON	Customized value displayed	-

Body Electrical > Air Conditioner > Data List

Tester Display
Efficient Ventilation Mode

Result	Proceed to
Efficient Ventilation Mode is set to "OFF"	A
Efficient Ventilation Mode is set to "ON"	B

B

CUSTOMIZE SETTING (Efficient Ventilation Mode to "OFF")

A

3.	READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ambient Temperature Sensor	Ambient temp. sensor (thermistor assembly)	-327.68 to 327.67°C	Actual ambient temperature displayed	Ambient temp. sensor (thermistor assembly) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temperature Sensor

OK:

The value of the display does not change frequently.

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Ambient Temperature Display System)

OK

4.	READ VALUE USING GTS (COOLANT TEMPERATURE)

(a) Read the Data List according to the display on the GTS.

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature	Min.: -40°C (-40°F) Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	This is the engine coolant temperature. HINT: After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal. If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted. Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

The value of the display does not change frequently.

NG

GO TO COOLING SYSTEM for M20A-FXS: Click here for 2ZR-FXE: Click here

OK

5.	CHECK REFRIGERANT PRESSURE

(a) Install a manifold gauge set.

for HFC-134a(R134a): Click here

for HFO-1234yf(R1234yf): Click here

(b) Prepare the Toyota Prius vehicle according to the table below.

Measurement Condition:

Item	Condition
Doors	Fully open
A/C Switch	On
Recirculation/fresh Control Switch	Recirculation
Set Temperature	MAX COLD
Blower Speed	HI
Air Conditioning Air Inlet Temperature	25 to 35°C (77 to 95°F)

(c) Compare the values displayed in the Data List and on the manifold gauge.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Regulator Pressure Sensor	Air conditioning pressure sensor	-32.768 to 32.767 MPaG	Actual refrigerant pressure displayed	Refrigerant line (gas leak etc.) Air conditioning pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

OK:

The values displayed in the Data List and on the manifold gauge match.

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here for HFO-1234yf(R1234yf): Click here

NG

REPLACE AIR CONDITIONING PRESSURE SENSOR

Recirculated/Fresh Air Modes do not Switch

DESCRIPTION

If the air inlet mode cannot be changed between recirculation/fresh or exhaust gas odors can be smelled even though recirculation mode is selected, the following factors may be the cause.

Symptom	Factor
Air inlet mode cannot be changed between recirculation/fresh Exhaust gas odors can be smelled when air inlet mode set to recirculation mode	No. 1 blower damper servo sub-assembly malfunction Damper link disconnection Air inlet damper mechanically locked Air conditioner unit assembly malfunction Engine coolant temperature (high)

PROCEDURE

1.	CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.

OK:

No. 1 blower damper servo sub-assembly is installed correctly.

NG

REINSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

OK

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B143A87 and B143B7F are not output	A
B143A87 is output	B
B143B7F is output	C

B

GO TO DTC B143A87

C

GO TO DTC B143B7F

A

3.	READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature	Min.: -40°C (-40°F) Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	This is the engine coolant temperature. HINT: After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal. If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted. Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

The value of the display does not change frequently.

OK

REPLACE AIR CONDITIONER UNIT ASSEMBLY

NG

GO TO COOLING SYSTEM for M20A-FXS: Click here for 2ZR-FXE: Click here

Air Vent cannot be Switched

DESCRIPTION

If the air outlet does not change even after the mode switch display changes, the following causes are possible.

Symptom	Factor
Air outlet mode cannot be changed (Air outlet display changes)	No. 1 air conditioning radiator damper servo sub-assembly malfunction Damper link disconnection Air conditioner unit assembly malfunction

PROCEDURE

1.	CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

OK:

The No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

NG

INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

OK

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B140287 and B14037F are not output	A
B140287 is output	B
B14037F is output	C

A

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

B

GO TO DTC B140287

C

GO TO DTC B14037F