Toyota Prius: Seat Heater System

Toyota Prius (XW60) 2023-2025 Service Manual / Vehicle Interior / Seat / Seat Heater System

Precaution
Parts Location
System Diagram
How To Proceed With Troubleshooting
Operation Check
Problem Symptoms Table
Terminals Of Ecu
Data List / Active Test
Diagnostic Trouble Code Chart
Front Right Seat Heat Sensor Circuit Short to Ground (B14C011,B14C015)
Seat Heater for Front Right Seat does not Operate
Seat Heater for Rear Right Seat does not Operate

Precaution

PRECAUTION

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

*A	w/ Rear Seat Heater	-	-
*1	AIR CONDITIONING AMPLIFIER ASSEMBLY	*2	AIR CONDITIONING CONTROL ASSEMBLY
*3	REAR SEAT HEATER SWITCH LH	*4	REAR SEAT HEATER SWITCH RH
*5	DLC3	*6	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - ECU-IGP NO. 3 FUSE - S/HTR RR FUSE
*7	POWER DISTRIBUTION BOX ASSEMBLY - S/HTR F/L FUSE - S/HTR F/R FUSE	*8	NO. 2 INSTRUMENT PANEL RELAY BLOCK - S HTR RL RELAY - S HTR RR RELAY

ILLUSTRATION

*1	FRONT SEAT CUSHION HEATER ASSEMBLY RH	*2	FRONT SEATBACK HEATER ASSEMBLY RH
*3	SEAT HEATER CONTROL SUB-ASSEMBLY RH	*4	FRONT SEAT CUSHION HEATER ASSEMBLY LH
*5	FRONT SEATBACK HEATER ASSEMBLY LH	*6	SEAT HEATER CONTROL SUB-ASSEMBLY LH

ILLUSTRATION

*A	w/ Rear Seat Heater	-	-
*1	REAR NO. 1 SEAT CUSHION HEATER ASSEMBLY RH	*2	REAR NO. 1 SEAT CUSHION HEATER ASSEMBLY LH
*3	REAR NO. 1 SEATBACK HEATER ASSEMBLY RH	*4	REAR NO. 1 SEATBACK HEATER ASSEMBLY LH

System Diagram

SYSTEM DIAGRAM

FRONT SEAT HEATER

REAR SEAT HEATER (w/ Rear Seat Heater)

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the seat heater system.
*: Use the GTS.

PROCEDURE

1.	Toyota Prius Vehicle BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

(a) Interview the customer to confirm the problem.

Click here

PRE-CHECK

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

Standard Voltage:

11 to 14 V

If the 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.

4.	INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

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

for HEV Model: Click here

for PHEV Model: Click here

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

GO TO CAN COMMUNICATION SYSTEM

for HEV Model: Click here

for PHEV Model: Click here

5.	CHECK FOR DTC*

(a) Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs

(b) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTCs are not output	A
Air conditioning system DTCs are output	B
Seat heater system DTCs are output	C

GO TO AIR CONDITIONING SYSTEM

for HEV Model: Click here

for PHEV Model: Click here

GO TO DIAGNOSTIC TROUBLE CODE CHART

6.	PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table	A
Fault is listed in Problem Symptoms Table	B

GO TO STEP 8

7.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Operation Check

Click here

(b) Terminals of ECU

Click here

(d) Inspection

8.	REPAIR OR REPLACE

9.	CONFIRMATION TEST

END

Operation Check

OPERATION CHECK

CHECK FRONT SEAT HEATER

(a) Turn the ignition switch to ON.

(b) Operate the front seat heater switch to switch the seat heater operation in order from HI → MID → LO → OFF and check that the heater level indicator illuminates.

(c) Check that the front seat surface temperature changes according to the operation of the front seat heater switch as follows: HI → MID → LO.

CHECK REAR SEAT HEATER (w/ Rear Seat Heater)

(a) Turn the ignition switch to ON.

(b) Set the rear seat heater switch to "HI" or "LO" and check that the seat heater operates.

(c) Operate the rear seat heater switch to switch the seat heater to "HI" or "LO" and check that the rear seat heater switch indicator illuminates or turns off.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

If the seat heater system is operated when the auxiliary battery voltage is low, due to the electrical load limit control that gives voltage supply priority to the power steering system, the seat heater system may not operate. In this case, check the Toyota Prius vehicle control history (RoB) of the power steering system and check that "Battery Voltage Drop: X208F" is not stored before proceeding with troubleshooting.

Click here

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Front Seat Heater

Symptom	Suspected Area	Link
Seat heater for front right seat does not operate	Refer to the "Seat Heater for Front Right Seat does not Operate".
Seat heater for front left seat does not operate	Refer to the "Seat Heater for Front Left Seat does not Operate".
Both front right seat heater and front left seat heater do not operate	Air conditioning control assembly
	Air conditioning amplifier assembly
	Power distribution box assembly
	Wire harness or connector	-

Rear Seat Heater (w/ Rear Seat Heater)

Symptom	Suspected Area	Link
Seat heater for rear RH seat does not operate	Refer to the "Seat Heater for Rear Right Seat does not Operate".
Seat heater for rear LH seat does not operate	Refer to the "Seat Heater for Rear Left Seat does not Operate".
Both rear right seat heater and rear left seat heater do not operate	Air conditioning control assembly
	Air conditioning amplifier assembly
	Wire harness or connector	-

Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

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

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K74-6 (IG ) - Body ground	IG power supply	Ignition switch off	Below 1 V
K74-6 (IG ) - Body ground	IG power supply	Ignition switch ON	11 to 14 V
K74-17 (GND) - Body ground	Ground	Always	Below 1 Ω

(d) Measure the voltage, resistance and check for pulses generation according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K74-7 (LIN1) - Body ground	LIN communication line	Ignition switch ON	Pulse generation (See waveform 1)
K73-20 (SH2R) - Body ground*1	RH side rear seat heater drive signal	Ignition switch ON Rear seat heater switch RH on	Below 1 V
K73-21 (SH2L) - Body ground*1	LH side rear seat heater drive signal	Ignition switch ON Rear seat heater switch LH on	Below 1 V
K75-12 (SM1R) - K74-17 (GND)*2	RH side front seat heater drive signal	Ignition switch ON Front seat heater switch RH on	Below 1 V
K75-14 (SM1R) - K74-17 (GND)*3	RH side front seat heater drive signal	Ignition switch ON Front seat heater switch RH on	Below 1 V
K75-13 (SM1L) - K74-17 (GND)	LH side front seat heater drive signal	Ignition switch ON Front seat heater switch LH on	Below 1 V
K76-1 (SG-6) - Body ground	Ground	Always	Below 1 Ω
K76-12 (TSR) - Body ground	RH side front seat heater sensor input signal	Ignition switch ON (0 to 30°C)	6.10 to 27.81 kΩ
K76-13 (TSL) - Body ground	LH side front seat heater sensor input signal	Ignition switch ON (0 to 30°C)	6.10 to 27.81 kΩ

*1: w/ Rear Seat Heater
*2: for HEV Model
*3: for PHEV Model

(1) Waveform 1

Item	Content
Tester Connection	K74-7 (LIN1) - Body ground
Tool setting	2 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON

CHECK AIR CONDITIONING CONTROL ASSEMBLY

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

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K68-1 (IG ) - Body ground	IG power supply	Ignition switch ON	11 to 14 V
K68-1 (IG ) - Body ground	IG power supply	Ignition switch off	Below 1 V
K68-16 (GND) - Body ground	Ground	Always	Below 1 Ω

(d) Measure the voltage and check for pulses generation according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K68-8 (SW1) - Body ground*	Rrer seat heater switch LH signal	Ignition switch ON Rear seat heater switch LH on	11 to 14 V
K68-8 (SW1) - Body ground*	Rrer seat heater switch LH signal	Ignition switch ON Rear seat heater switch LH off	Below 1 V
K68-9 (SW2) - Body ground*	Rear seat heater switch RH signal	Ignition switch ON Rear seat heater switch RH on	11 to 14 V
K68-9 (SW2) - Body ground*	Rear seat heater switch RH signal	Ignition switch ON Rear seat heater switch RH off	Below 1 V
K68-12 (SWA) - Body ground*	Rear seat heater switch LH indicator drive signal	Rear seat heater switch LH indicator illuminates	Below 1 V
K68-12 (SWA) - Body ground*	Rear seat heater switch LH indicator drive signal	Rear seat heater switch LH indicator not illuminates	11 to 14 V
K68-13 (SWB) - Body ground*	Rear seat heater switch RH indicator drive signal	Rear seat heater switch RH indicator illuminates	Below 1 V
K68-13 (SWB) - Body ground*	Rear seat heater switch RH indicator drive signal	Rear seat heater switch RH indicator not illuminates	11 to 14 V
K68-14 (LIN1) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

*: w/ Rear Seat Heater

(1) Waveform 1

Item	Content
Tester Connection	K68-14 (LIN1) - Body ground
Tool setting	2 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

NOTICE:

In the following table, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

HINT:

Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

(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 Seat Heat Sensor	LH side front seat heater temperature sensor	0 to 655.35 kohm	2.64 to 8.00 kohm	Front seat heater switch LH on
Front Right Seat Heat Sensor	RH side front seat heater temperature sensor	0 to 655.35 kohm	2.64 to 8.00 kohm	Front seat heater switch RH on
Front Right Seat Heater	RH side front seat heater condition	OFF or ON	OFF: RH side front seat heater does not operate ON: RH side front seat heater operate	-
Front Left Seat Heater	LH side front seat heater condition	OFF or ON	OFF: LH side front seat heater does not operate ON: LH side front seat heater operate	-
Rear Right Seat Heater	RH side rear seat heater condition	OFF or ON	OFF: RH side rear seat heater does not operate ON: RH side rear seat heater operate	w/ Rear Seat Heater
Rear Left Seat Heater	LH side rear seat heater condition	OFF or ON	OFF: LH side rear seat heater does not operate ON: LH side rear seat heater operate	w/ Rear Seat Heater

ACTIVE TEST

HINT:

Using the GTS to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(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 Right Seat Heater	Front seat RH side seat heater operation	OFF or ON	-
Front Left Seat Heater	Front seat LH side seat heater operation	OFF or ON	-
Rear Right Seat Heater	Rear seat RH side seat heater operation	OFF or ON	w/ Rear Seat Heater
Rear Left Seat Heater	Rear seat LH side seat heater operation	OFF or ON	w/ Rear Seat Heater

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Seat Heater System

DTC No.	Detection Item	DTC Output from	Priority
B14C011	Front Right Seat Heat Sensor Circuit Short to Ground	Air Conditioner	A
B14C015	Front Right Seat Heat Sensor Circuit Short to Battery or Open	Air Conditioner	A
B14C111	Front Left Seat Heat Sensor Circuit Short to Ground	Air Conditioner	A
B14C115	Front Left Seat Heat Sensor Circuit Short to Battery or Open	Air Conditioner	A

Front Right Seat Heat Sensor Circuit Short to Ground (B14C011,B14C015)

DESCRIPTION

Output to the front seat cushion heater temperature sensor stops if one of the following occurs: 1) the temperature sensor is open or shorted; or 2) the temperature sensor is damaged and its output value does not change.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B14C011	Front Right Seat Heat Sensor Circuit Short to Ground	A short to ground in the temperature sensor circuit of the front right seat heater occurs for 4 seconds or more.	Front seat cushion heater assembly RH Air conditioning amplifier assembly Wire harness or connector	Air Conditioner	A
B14C015	Front Right Seat Heat Sensor Circuit Short to Battery or Open	A short to B or open in the temperature sensor circuit of the front right seat heater occurs for 4 seconds or more.	Front seat cushion heater assembly RH Air conditioning amplifier assembly Wire harness or connector	Air Conditioner	A

WIRING DIAGRAM

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B14C011 and B14C015 are not output	A
B14C011 is output	B
B14C015 is output	C

USE SIMULATION METHOD TO CHECK

GO TO STEP 4

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION HEATER ASSEMBLY RH)

Pre-procedure1

(a) Disconnect the K76 air conditioning amplifier assembly connector.

(b) Disconnect the a8 front seat cushion heater assembly RH connector.

Procedure1

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

Standard Resistance:

Click Location & Routing(K76,a8) Click Connector(K76) Click Connector(a8)

Tester Connection	Condition	Specified Condition	Result
K76-12 (TSR) or a8-4 (THR ) - Body ground	Always	10 kΩ or higher	kΩ
K76-1 (SG-6) or a8-5 (THR-) - Body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(e) None

GO TO STEP 5

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION HEATER ASSEMBLY RH)

Pre-procedure1

(a) Disconnect the K76 air conditioning amplifier assembly connector.

(b) Disconnect the a8 front seat cushion heater assembly RH connector.

Procedure1

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

Standard Voltage:

Click Location & Routing(K76,a8) Click Connector(K76) Click Connector(a8)

Tester Connection	Condition	Specified Condition	Result
K76-12 (TSR) or a8-4 (THR ) - Body ground	Ignition switch ON	Below 1 V	V
K76-1 (SG-6) or a8-5 (THR-) - Body ground	Ignition switch ON	Below 1 V	V

Standard Resistance:

Click Location & Routing(K76,a8) Click Connector(K76) Click Connector(a8)

Tester Connection	Condition	Specified Condition	Result
K76-12 (TSR) - a8-4 (THR )	Always	Below 1 Ω	Ω
K76-1 (SG-6) - a8-5 (THR-)	Always	Below 1 Ω	Ω

Post-procedure1

(e) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY RH

HINT:

Click here

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY RH

Seat Heater for Front Right Seat does not Operate

DESCRIPTION

When the front seat heater switch is operated, the air conditioning amplifier assembly receives a signal and operates the front seat heater.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the seat heater system is operated when the auxiliary battery voltage is low, due to the electrical load limit control that gives voltage supply priority to the power steering system, the seat heater system may not operate. In this case, check the Toyota Prius vehicle control history (RoB) of the power steering system and check that "Battery Voltage Drop: X208F" is not stored before proceeding with troubleshooting.
Click here
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
Front Right Seat Heater	Front seat RH side seat heater operation	OFF or ON	-

Body Electrical > Air Conditioner > Active Test

Tester Display
Front Right Seat Heater

OK:

Front seat RH side seat heater operates normally.

GO TO AIR CONDITIONING SYSTEM

for HEV Model: Click here

for PHEV Model: Click here

2.	CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY RH - POWER SUPPLY)

(a) Disconnect the a10 seat heater control sub-assembly RH connector.

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

Standard Voltage:

Click Location & Routing(a10) Click Connector(a10)

Tester Connection	Condition	Specified Condition
a10-1 ( B1) - Body ground	Ignition switch ON	11 to 14 V
a10-1 ( B1) - Body ground	Ignition switch off	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SEAT HEATER CONTROL SUB-ASSEMBLY RH)

(a) Disconnect the K75 air conditioning amplifier assembly connector.

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

Standard Resistance:

for HEV Model

Click Location & Routing(K75,a10) Click Connector(K75) Click Connector(a10)

Tester Connection	Condition	Specified Condition
K75-12 (SM1R) -a10-5 (SWR)	Always	Below 1 Ω
K75-12 (SM1R) or a10-5 (SWR) - Body ground	Always	10 kΩ or higher

for PHEV Model

Click Location & Routing(K75,a10) Click Connector(K75) Click Connector(a10)

Tester Connection	Condition	Specified Condition
K75-14 (SM1R) -a10-5 (SWR)	Always	Below 1 Ω
K75-14 (SM1R) or a10-5 (SWR) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (FRONT SEAT CUSHION HEATER ASSEMBLY RH - SEAT HEATER CONTROL SUB-ASSEMBLY RH AND BODY GROUND)

(a) Disconnect the a8 front seat cushion heater assembly RH connector.

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

Standard Resistance:

Click Location & Routing(a8,a10) Click Connector(a8) Click Connector(a10)

Tester Connection	Condition	Specified Condition
a8-1 (HTR) - a10-7 (HTR1)	Always	Below 1 Ω
a8-6 (E) - a10-10 (E)	Always	Below 1 Ω
a8-1 (HTR) or a10-7 (HTR1) - Body ground	Always	10 kΩ or higher
a8-6 (E) or a10-10 (E) - Body ground	Always	10 kΩ or higher
a8-2 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY RH

Click here

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY RH

6.	INSPECT FRONT SEATBACK HEATER ASSEMBLY RH

Click here

REPLACE FRONT SEATBACK HEATER ASSEMBLY RH

7.	REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY RH

(a) Temporarily replace the seat heater control sub-assembly RH with a new or known good one.

Click here

8.	CHECK FRONT SEAT HEATER OPERATION

(a) Check the front seat RH side seat heater operation.

Click here

OK:

Front seat RH side seat heater operates normally.

END (SEAT HEATER CONTROL SUB-ASSEMBLY RH WAS DEFECTIVE)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Seat Heater for Rear Right Seat does not Operate

DESCRIPTION

When the rear seat heater switch RH is operated, the air conditioning amplifier assembly receives the signal from the air conditioning control assembly via the LIN communication line and operates the RH side rear seat heater.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the seat heater system is operated when the auxiliary battery voltage is low, due to the electrical load limit control that gives voltage supply priority to the power steering system, the seat heater system may not operate. In this case, check the Toyota Prius vehicle control history (RoB) of the power steering system and check that "Battery Voltage Drop: X208F" is not stored before proceeding with troubleshooting.
Click here
Inspect the fuses related to this system before inspecting the suspected areas below.

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
Rear Right Seat Heater	RH side rear seat heater operation	OFF/ON	-

Body Electrical > Air Conditioner > Active Test

Tester Display
Rear Right Seat Heater

OK:

RH side rear seat heater operates normally.

GO TO STEP 7

2.	INSPECT REAR SEAT HEATER SWITCH RH

Click here

REPLACE REAR SEAT HEATER SWITCH RH

3.	CHECK HARNESS AND CONNECTOR (REAR SEAT HEATER SWITCH RH - POWER SUPPLY)

(a) Disconnect the K29 rear seat heater switch RH connector.

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

Standard Voltage:

Click Location & Routing(K29) Click Connector(K29)

Tester Connection	Switch Condition	Specified Condition
K29-3 (B) - Body ground	Ignition switch ON	11 to 14 V
K29-3 (B) - Body ground	Ignition switch off	Below 1 V

Standard Resistance:

Click Location & Routing(K29) Click Connector(K29)

Tester Connection	Condition	Specified Condition
K29-2 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (REAR SEAT HEATER SWITCH RH - AIR CONDITIONING CONTROL ASSEMBLY)

(a) Disconnect the K29 rear seat heater switch RH connector.

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

Standard Resistance:

Click Location & Routing(K29,K68) Click Connector(K29) Click Connector(K68)

Tester Connection	Condition	Specified Condition
K29-4 (IND) - K68-13 (SWB)	Always	Below 1 Ω
K29-4 (IND) or K68-13 (SWB) - Body ground	Always	10 kΩ or higher
K29-5 (IG) - K68-9 (SW2)	Always	Below 1 Ω
K29-5 (IG) or K68-9 (SW2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	REPLACE AIR CONDITIONING CONTROL ASSEMBLY

(a) Replace the air conditioning control assembly with a new or known good one.

Click here

6.	CHECK REAR SEAT HEATER OPERATION

(a) Check the RH side rear seat heater operation.

Click here

OK:

RH side rear seat heater operates normally.

END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

7.	INSPECT S HTR RR RELAY

(a) Remove the S HTR RR relay.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Auxiliary battery voltage not applied between terminals 1 and 2	10 kΩ or higher
3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω

REPLACE S HTR RR RELAY

8.	CHECK HARNESS AND CONNECTOR (S HTR RR RELAY - POWER SUPPLY)

(a) Remove the S HTR RR relay.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
S HTR RR relay terminal 1 - Body ground	Ignition switch ON	11 to 14 V
S HTR RR relay terminal 1 - Body ground	Ignition switch off	Below 1 V
S HTR RR relay terminal 5 - Body ground	Ignition switch off	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (S HTR RR RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Remove the S HTR RR relay.

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

Standard Resistance:

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

Tester Connection	Condition	Specified Condition
S HTR RR relay terminal 2 - K73-20 (SH2R)	Always	Below 1 Ω
S HTR RR relay terminal 2 or K73-20 (SH2R) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (REAR NO. 1 SEAT CUSHION HEATER ASSEMBLY RH - S HTR RR RELAY AND BODY GROUND)

(a) Disconnect the R67 rear No. 1 seat cushion heater assembly RH connector.

(b) Remove the S HTR RR relay.

Standard Resistance:

Click Location & Routing(R67) Click Connector(R67)

Tester Connection	Condition	Specified Condition
R67-1 (B) - S HTR RR relay terminal 3	Always	Below 1 Ω
R67-1 (B) or S HTR RR relay terminal 3 - Body ground	Always	10 kΩ or higher
R67-2 (E) - Body ground	Always	Below 1 Ω