Toyota Prius: Wiper And Washer System

Toyota Prius (XW60) 2023-2025 Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System

Precaution
Parts Location
System Diagram
How To Proceed With Troubleshooting
Operation Check
Customize Parameters
Problem Symptoms Table
Terminals Of Ecu
Fail-safe Chart
Data List / Active Test
Humidity/Rain Sensor Missing Message (B127987)
Rain Sensor Component Internal Failure (B140096)
Wiper Module Missing Message (B235787)
Front Wiper Motor Circuit
Wiper and Washer Switch Circuit
Rear Cleaner Motor and Relay Circuit
Washer Fluid Level Warning Switch Circuit

Precaution

PRECAUTION

PRECAUTION 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

PRECAUTION FOR WASHER NOZZLE ADJUSTMENT

(a) Do not clean or adjust the washer nozzle with a safety pin, etc. because:

(1) The washer nozzle tip is made of resin and may be damaged.

(2) Adjustment is not necessary for this spray type washer nozzle. If it is necessary to change the nozzle angle, replace the washer nozzle with one that has a different nozzle angle.

Click here

(b) If the washer nozzle is clogged with wax, etc., remove it and clean the nozzle hole with a soft resin brush or other cleaning tool.

PRECAUTIONS FOR RAIN SENSOR (w/ Auto Wiper System)

(a) When the ignition switch is ON and the front wiper switch is in the AUTO position, the rain sensor may operate the front wipers if the rain sensor sensing portion of the windshield glass is touched by a hand or if something moist, such as a wet cloth, is brought near. This may lead to injury or damage to the Toyota Prius vehicle.

(b) When the ignition switch is ON and the front wiper switch is in the AUTO position, the rain sensor may operate the wipers if the rain sensor or parts around the rain sensor (windshield glass, rain sensor cover, etc.) are vibrated.

(c) If the windshield glass is coated with a water-repellent coating, the rain sensor may not correctly detect the amount of raindrops that strike the windshield and the auto wiper system may not operate normally.

(d) As the rain sensor is an optical sensor, if sunlight intermittently strikes the windshield glass or the rain sensor sensing portion of the windshield glass is dirty, the auto wiper system may not operate normally.

(e) The rain sensor cannot operate if the front wipers are stopped in any position other than the park position.

PRECAUTIONS FOR REAR CAMERA WASHER SYSTEM (w/ Rear Camera Cleaner System)

(a) After replacing the parking assist ECU or rear television camera assembly, it is necessary to set the camera cleaner setting to ON.

Parking Assist Monitor System:
Click here
Panoramic View Monitor System:
Click here

Parts Location

PARTS LOCATION

ILLUSTRATION

*A	for LHD	*B	w/ Auto Wiper System
*C	w/ Level Warning Switch Assembly	-	-
*1	WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY	*2	WINDSHIELD WIPER MOTOR ASSEMBLY
*3	RAIN SENSOR	*4	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - WINDSHILD WIPER RELAY - IGP RELAY - WIPER FUSE - WASHER FUSE
*5	LEVEL WARNING SWITCH ASSEMBLY	-	-

ILLUSTRATION

*1	STEERING WHEEL SWITCH HOUSING	*2	WINDSHIELD WIPER SWITCH ASSEMBLY
*3	WINDSHIELD WIPER RELAY ASSEMBLY	*4	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*5	POWER DISTRIBUTION BOX ASSEMBLY - IGR NO. 1 RELAY - ECU-IGR NO. 3 FUSE	*6	COMBINATION METER ASSEMBLY
*7	STEERING SENSOR	*8	DLC3

System Diagram

SYSTEM DIAGRAM

FRONT WIPER AND WASHER SYSTEM

WASHER FLUID LEVEL WARNING SYSTEM(w/ Level Warning Switch Assembly)

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the wiper and washer system.

*: Use the GTS.

PROCEDURE

1.	Toyota Prius Vehicle BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

The following 5 items are important points for problem analysis:

What	Toyota Prius Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Driving conditions, weather conditions
How did it happen?	Problem symptoms

PRE-CHECK

(a) Measure the auxiliary battery voltage with 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.	CHECK 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) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

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

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 PROBLEM SYMPTOMS TABLE

7.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Operation Check

Click here

(b) Customize Parameters

Click here

(d) Data List / Active Test

Click here

(e) Inspection

(f) On-Toyota Prius vehicle Inspection

8.	ADJUST, REPAIR OR REPLACE

9.	CONFIRMATION TEST

END

Operation Check

OPERATION CHECK

CHECK FRONT WIPER CONTROL (w/ Auto Wiper System)

(a) Auto wiper function

(1) Continuously apply water to the windshield glass in front of the rain sensor.

(2) Turn the ignition switch to ON.

(3) Move the front wiper switch to the AUTO position.

(4) Check that the front wipers operate.

(b) Intermittent control function

HINT:

When the AUTO wiper function is disabled through a customize setting, the intermittent control function can be operated.

Click here

(1) Turn the ignition switch to ON.

(2) Move the front wiper switch to the AUTO position.

(3) Check that the intermittent operation interval can be adjusted between approximately 4 and 12.5 seconds by operating the auto sensitivity adjustment switch.

HINT:

When the AUTO wiper function is disabled through a customize setting, the intermittent control function can be operated.

Click here

(1) Turn the ignition switch to ON.

(2) Move the front wiper switch to the AUTO position.

(3) Check that the intermittent operation interval changes between approximately 1.5 and 11 seconds according to the Toyota Prius vehicle speed and the position of the auto sensitivity adjustment switch.

(d) Door open linked wiper suspend function

(1) Continuously apply water to the windshield glass in front of the rain sensor.

(2) Turn the ignition switch to ON.

(3) Move the front wiper switch to the AUTO position and check that the front wipers operate.

(4) Open the driver door or front passenger door and check that the front wipers stop.

(5) Close the driver door or front passenger door and check that the front wipers re-operates.

CHECK FRONT WIPER CONTROL (w/o Auto Wiper System)

(a) Intermittent control function

(1) Turn the ignition switch to ON.

(2) Move the front wiper switch to the INT position.

(3) Check that the intermittent operation interval can be adjusted between approximately 4 and 12.5 seconds by operating the intermittent time adjustment switch.

(b) Toyota Prius Vehicle speed sensing type adjustable intermittent wiper control function

(1) Turn the ignition switch to ON.

(2) Move the front wiper switch to the INT position.

(3) Check that the intermittent operation interval changes between approximately 1.5 and 11 seconds according to the vehicle speed and the position of the intermittent time adjustment switch.

CHECK WASHER CONTROL

(a) Front washer cooperation

(1) Turn the ignition switch to ON.

(2) Hold the washer switch in the Fr WASH position for approximately 0.5 seconds or more and check that the front wipers operate in LO and washer fluid is sprayed.

(3) Release the washer switch and check that the front wipers operate for 3 cycles.

(b) Drip prevention wiper function

NOTICE:

Perform this inspection with the Toyota Prius vehicle stopped.

(1) Turn the ignition switch to ON.

(2) Operate the washers and check that approximately 3 seconds after front washer cooperation operates, the wipers operate 1 cycle.

CHECK REAR CAMERA WASHER SYSTEM (w/ Rear Camera Cleaner System)

(a) Combination switch

(1) Turn the ignition switch to ON.

(2) Hold the washer switch in the Rr WASH position and check that the rear television camera assembly is sprayed with washer fluid.

(b) Multimedia switch

(1) One push

The rear camera washer operates for a certain amount of time.

(2) Pressed and held

The rear camera washer operates while the multimedia switch is pressed and held.

LEVEL WARNING OPERATION INSPECTION(w/ Level Warning Switch Assembly)

(a) When the volume of washer fluid decreases to below a certain level (when the level warning switch is turned on), the multi-information display warns the driver by displaying a message.

Customize Parameters

CUSTOMIZE PARAMETERS

CUSTOMIZE WIPER AND WASHER SYSTEM

NOTICE:

When the customer requests a change in a function, first make sure that the function can be customized.
Be sure to make a note of the current settings before customizing.
When troubleshooting a function, first make sure that the function is set to the default setting.

HINT:

The following items can be customized.

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

Wiper

Tester Display	Description	Default	Setting	ECU
Auto Wiper Function	Function to enable AUTO wiper operation*	Avail	$00:Enable,$01:Disable	Main body ECU (Multiplex network body ECU)

HINT:

Changes to the customize settings will not be applied until the ignition switch is turned off then ON.
*: w/ Auto Wiper System

Others

Tester Display	Description	Default	Setting	ECU
Wiper Voice Control Function	Function to enable the wiper-linked voice recognition operation function*	Enable	$00:Disable,$01:Enable	Main body ECU (Multiplex network body ECU)

*: w/ Body Device Voice Recognition Function

HINT:

Changes to the customize settings will not be applied until the ignition switch is turned off then ON.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

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 Wiper System (w/ Auto Wiper System)

Symptom	Suspected Area	Link
Front wipers do not operate at all	Proceed to "Wiper and Washer Switch Circuit"
	Proceed to "Front Wiper Motor Circuit"
	Main body ECU (Multiplex network body ECU)
	Windshield wiper relay assembly
Front wipers do not operate in AUTO	Check customize parameters (Auto wiper)
	Rain sensor tape (Check for air bubbles)	-
	Proceed to "Wiper and Washer Switch Circuit"
	Rain sensor
Front wipers do not operate in LO	Proceed to "Wiper and Washer Switch Circuit"
	Proceed to "Front Wiper Motor Circuit"
	Windshield wiper relay assembly
Front wipers do not operate in HI	Proceed to "Wiper and Washer Switch Circuit"
	Proceed to "Front Wiper Motor Circuit"
	Windshield wiper relay assembly
Front wipers do not operate in INT*	Proceed to "Wiper and Washer Switch Circuit"
Front wipers do not operate in MIST	Proceed to "Wiper and Washer Switch Circuit"
Front wipers do not operate in MIST	Windshield wiper relay assembly
When the front wipers are operating in AUTO, the rain sensor sensitivity cannot be adjusted by the auto sensitivity adjustment switch (wiping interval does not change)	Proceed to "Wiper and Washer Switch Circuit"
When the front wipers are operating in AUTO, the wiper interval does not change according to changes in the Toyota Prius vehicle speed	Rain sensor
	Main body ECU (Multiplex network body ECU)
When the front wipers are operating in INT, the front wiper intermittent operation interval cannot be adjusted by the auto sensitivity adjustment switch (wiping interval does not change)*	Proceed to "Wiper and Washer Switch Circuit"
When the front wipers are operating in INT, the front wiper intermittent operation interval does not change according to changes in the Toyota Prius vehicle speed*	Main body ECU (Multiplex network body ECU)
Front wipers continuously operate in AUTO	Proceed to "Wiper and Washer Switch Circuit"
Front wipers continuously operate in LO	Proceed to "Wiper and Washer Switch Circuit"
Front wipers continuously operate in HI	Proceed to "Wiper and Washer Switch Circuit"
Front wipers continuously operate in INT*	Proceed to "Wiper and Washer Switch Circuit"
When the customize setting "Auto Wiper" is changed, the operation of the wiper system does not change	Rain sensor
When the front wiper switch is turned off, the front wipers stop in the wrong position	Proceed to "Front Wiper Motor Circuit"
	Check the automatic stop (park) position
	Windshield wiper relay assembly

*: When the customize setting "Auto Wiper" is set to "Not Avl".

Front Wiper System (w/o Auto Wiper System)

Symptom	Suspected Area	Link
Front wipers do not operate at all	Proceed to "Wiper and Washer Switch Circuit"
	Proceed to "Front Wiper Motor Circuit"
	Main body ECU (Multiplex network body ECU)
	Windshield wiper relay assembly
Front wipers do not operate in LO	Proceed to "Wiper and Washer Switch Circuit"
	Proceed to "Front Wiper Motor Circuit"
	Windshield wiper relay assembly
Front wipers do not operate in HI	Proceed to "Wiper and Washer Switch Circuit"
	Proceed to "Front Wiper Motor Circuit"
	Windshield wiper relay assembly
Front wipers do not operate in INT	Proceed to "Wiper and Washer Switch Circuit"
	Proceed to "Front Wiper Motor Circuit"
	Windshield wiper relay assembly
Front wipers do not operate in MIST	Proceed to "Wiper and Washer Switch Circuit"
Front wipers do not operate in MIST	Windshield wiper relay assembly
When the front wiper switch is in INT, the front wiper intermittent operation interval cannot be adjusted by the intermittent time adjustment switch	Proceed to "Wiper and Washer Switch Circuit"
	Main body ECU (Multiplex network body ECU)
When the front wipers are operating in INT, the front wiper intermittent operation interval does not change according to changes in the Toyota Prius vehicle speed	Main body ECU (Multiplex network body ECU)
Front wipers continuously operate in LO	Proceed to "Wiper and Washer Switch Circuit"
Front wipers continuously operate in LO	Windshield wiper relay assembly
Front wipers continuously operate in HI	Proceed to "Wiper and Washer Switch Circuit"
Front wipers continuously operate in HI	Windshield wiper relay assembly
Front wipers continuously operate in INT	Proceed to "Wiper and Washer Switch Circuit"
Front wipers do not move to the service position (wiper operation is normal)	Main body ECU (Multiplex network body ECU)
When the front wiper switch is turned off, the front wipers do not move to the park position or stop in the wrong position	Proceed to "Front Wiper Motor Circuit"
	Check the automatic stop (park) position
	Windshield wiper relay assembly

Washer System

Symptom	Suspected Area	Link
Windshield washer motor and pump assembly does not operate	Proceed to "Wiper and Washer Switch Circuit"
	Proceed to "Washer Motor Circuit"
	Windshield wiper relay assembly
Front washers do not operate	Proceed to "Wiper and Washer Switch Circuit"
Front washers do not operate	Windshield wiper relay assembly
Washer fluid does not flow (Windshield washer motor and pump assembly is normal)	Washer fluid	-
	Washer hose and nozzle	-

Rear Camera Washer System (w/ Rear Camera Cleaner System)

Symptom	Suspected Area	Link
Washer motor and pump assembly does not operate	Proceed to "Rear Cleaner Motor and Relay Circuit"
	Proceed to "Wiper and Washer Switch Circuit"
	Main body ECU (multiplex network body ECU)
Washer fluid does not flow (Washer motor and pump assembly is normal)	Washer fluid	-
	Washer hose, camera cleaner nozzle	-

Washer Fluid Level Warning System

Symptom	Suspected Area	Link
"Windshield Washer Fluid Low" is displayed on the multi-information display when washer fluid level is not low	Proceed to "Washer Fluid Level Warning Switch Circuit"
"Windshield Washer Fluid Low" is not displayed on the multi-information display when washer fluid level is low	Washer fluid	-
	Proceed to "Washer Fluid Level Warning Switch Circuit"

Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Click here

(b) Reconnect the power distribution box assembly connectors.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
z1-13 (GND1) - Body ground	Ground	Always	Below 1 Ω
z1-14 (GND2) - Body ground	Ground	Always	Below 1 Ω
z1-26 (BECU) - Body ground	Auxiliary battery power supply	Always	11 to 14 V
z1-27 (IGR) - Body ground	IG power supply	Ignition switch off	Below 1 V
z1-27 (IGR) - Body ground	IG power supply	Ignition switch ON	11 to 14 V
z1-22 - Body ground	CXPI communication line	Ignition switch off	Below 1 V
z1-22 - Body ground	CXPI communication line	Ignition switch ON	Pulse generation
z1-15 (LIN2) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

(d) Connect the power distribution box assembly and main body ECU (multiplex network body ECU) connectors.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K17-12 (WHI) - Body ground	Windshield wiper motor assembly HI operation signal	Windshield wiper motor and link assembly operating in LO	9 to 14 V
K17-12 (WHI) - Body ground	Windshield wiper motor assembly HI operation signal	Windshield wiper motor and link assembly operating in HI	Below 1 V
K16-11 (LIN4) - Body ground	LIN communication line	Ignition switch ON	Pulse generation
K17-6 (WPS) - Body ground	Wiper Relay operation signal	Ignition switch ON	11 to 14 V
		Less than approximately 60 seconds after ignition switch turned off	11 to 14 V
		Approximately 60 seconds or more after ignition switch turned off	Below 1 V

CHECK WINDSHIELD WIPER RELAY ASSEMBLY

(a) Disconnect the A55 and A56 windshield wiper relay assembly connectors.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A55-3 (E) - Body ground	Ground	Always	Below 1 Ω
A55-5 (EWS) - Body ground	Ground	Always	Below 1 Ω
A55-6 (IGWS) - Body ground	Washer circuit IG power source	Ignition switch ON	11 to 14 V
A55-8 ( B) - Body ground	Ignition switch ON signal (Power source circuit)	Ignition switch ON	11 to 14 V
		Less than approximately 60 seconds after ignition switch turned off	11 to 14 V
		Approximately 60 seconds or more after ignition switch turned off	Below 1 V
A56-5 (ES) - Body ground	Ground	Always	Below 1 Ω

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A55-1 ( WR) - Body ground	Front washer operation signal	Ignition switch ON, front washer operating	11 to 14 V
A55-2 ( 1) - Body ground	LO operation signal to windshield wiper motor assembly	Ignition switch ON, windshield wiper motor assembly operating in LO	11 to 14 V
A55-4 ( 2) - Body ground	HI operation signal to windshield wiper motor assembly	Ignition switch ON, windshield wiper motor assembly operating in HI	11 to 14 V
A55-7 (-WR) - Body ground	Rear washer operation signal	Ignition switch ON, rear washer operating	11 to 14 V
A56-3 (2S) - Body ground	Windshield wiper motor assembly HI operation signal	Approximately 60 seconds or more after ignition switch turned off	4.5 to 5.5 V
		Windshield wiper motor assembly operating in LO	9 to 14 V
		Windshield wiper motor assembly operating in HI	Below 1 V
A56-4 (MPX1) - Body ground	CXPI communication line	Ignition switch ON	Pulse generation
A56-6 ( SM) - Body ground	Windshield wiper motor assembly position detection signal	Windshield wiper motor assembly in LO or HI operation	Below 1 V ←→ 11 to 14 V
A56-6 ( SM) - Body ground	Windshield wiper motor assembly position detection signal	Windshield wiper motor assembly stopped	Below 1 V

CHECK RAIN SENSOR (w/ Auto Wiper System)

(a) Disconnect the U4 rain sensor connector.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
U4-2 (ES) - Body ground	Ground	Always	Below 1 Ω
U4-3 (MPX) - Body ground	LIN communication signal	Ignition switch ON	Pulse generation
U4-4 (SIG) - Body ground	IG power source circuit	Ignition switch ON	11 to 14 V

Fail-safe Chart

FAIL-SAFE CHART

RAIN SENSOR FAIL-SAFE FUNCTION (w/ Auto Wiper System)

(a) The rain sensor performs fail-safe functions when it cannot properly receive necessary signals for wiper system control or a wiper system component is malfunctioning.

Item	Fail-safe Function	Conditions to Return to Normal Condition
Rain sensor voltage is too low	Continues control according to the conditions detected before the malfunction	Rain sensor voltage returns to normal
The rain sensor temperature is excessively high (90°C (194°F) or higher)	Stops the wiper operation	Rain sensor returns to normal
The rain sensor temperature is excessively low (-15°C (5°F) or lower)		Rain sensor returns to normal
Rain sensor LIN communication error		LIN communication returns to normal
Abnormal rain sensor signal	Performs intermittent operation according to the position of the auto sensitivity adjustment switch	Rain sensor returns to normal

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

NOTICE:

In the table below, 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 > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Wiper Motor Cam Switch 1	Front wiper stop position status	OFF or ON	OFF: Front wiper not at bottom of stroke ON: Front wiper at bottom of stroke	-
Wiper Control Switch HI	Front wiper switch HI position signal	OFF or ON	OFF: Front wiper switch not in HI position ON: Front wiper switch in HI position	-
Rain Sensor Status	Rain sensor temperature circuit condition	Normal or Error	Normal: Rain sensor is normal Error: Malfunction in rain sensor thermistor	w/ Auto Wiper System
Rain Sensor Level Status	Rain sensor output condition	Normal or Error	Normal: Rain sensor is normal Error: Malfunction in rain sensor thermistor output	w/ Auto Wiper System
Rain Sensor High Temperature Status	Rain sensor high temperature condition	Normal or Error	Normal: Rain sensor is normal Error: Rain sensor temperature is high	w/ Auto Wiper System
Rain Sensor Low Temperature Status	Rain sensor low temperature condition	Normal or Error	Normal: Rain sensor is normal Error: Rain sensor temperature is low	w/ Auto Wiper System
Wiper Switch Auto Signal	Windshield wiper switch assembly (AUTO position) condition	OFF or ON	OFF: Windshield wiper switch assembly not in AUTO position ON: Windshield wiper switch assembly in AUTO position	w/ Auto Wiper System
Wiper Operation Request (from other system)	Status of wiper operation request from other system	OFF or ON	OFF: Not requested ON: Requested	w/ Auto Wiper System
Wiper Motor Control Status	Wiper motor control condition in response to rain sensor request	Normal, Normal (Link Ctrl), Normal (Req Deny), Abnormal or Normal (Wiper Ctrl)	Current motor control condition	w/ Auto Wiper System
Wiper Intermittent Time Volume	Auto sensitivity adjustment volume condition	Shortest, Shorter, Longer or Longest	Shortest: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) P4 position Shorter: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) P3 position Longer: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) P2 position Longest: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) P1 position	*
Automatic Wiper Wiping Mode (Sensor to Wiper)	Status of command request signal for front wiper speed and intermittent time from rain sensor	Stop, LO Mode, HI Mode, Wait, INT Mode1 (Toyota Prius Vehicle Stop), INT Mode2 (Vehicle Stop), INT Mode3 (Vehicle Stop), INT Mode4 (Vehicle Stop), INT Mode5 (Vehicle Stop), INT Mode6 (Vehicle Stop), INT Mode7 (Vehicle Stop), INT Mode1 (Vehicle Run), INT Mode2 (Vehicle Run), INT Mode3 (Vehicle Run), INT Mode4 (Vehicle Run), INT Mode5 (Vehicle Run), INT Mode6 (Vehicle Run), INT Mode7 (Toyota Prius Vehicle Run), INT Mode (Sensor Abnormal), OFF (Customize) or Fail Stop	Stop: Windshield wiper switch assembly in AUTO position and stop requested (Windshield wiper switch assembly OFF included) (because rain not detected) LO Mode: Windshield wiper switch assembly in AUTO position and LO operation requested HI Mode: Windshield wiper switch assembly in AUTO position and HI operation requested Wait: Rain sensor is judging wiping mode INT Mode 1 (Toyota Prius Vehicle Stop): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 32.7 s INT Mode 2 (Vehicle Stop): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 17.5 s INT Mode 3 (Vehicle Stop): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 9.7 s INT Mode 4 (Toyota Prius Vehicle Stop): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 5.4 s INT Mode 5 (Vehicle Stop): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 3.1 s INT Mode 6 (Vehicle Stop): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 1.6 s INT Mode 7 (Toyota Prius Vehicle Stop): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 0.8 s INT Mode 1 (Vehicle Run): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 17.9 s INT Mode 2 (Vehicle Run): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 10.1 s INT Mode 3 (Toyota Prius Vehicle Run): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 5.9 s INT Mode 4 (Vehicle Run): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 3.5 s INT Mode 5 (Vehicle Run): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 2.1 s INT Mode 6 (Toyota Prius Vehicle Run): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 1.2 s INT Mode 7 (Vehicle Run): Windshield wiper switch assembly in AUTO position and intermittent operation requested of 0.6 s INT Mode (Sensor Abnormal): Windshield wiper switch assembly in AUTO position and speed sensing intermittent operation requested OFF (Customize): Windshield wiper switch assembly in AUTO position and stop requested (for customization) Fail Stop: Windshield wiper switch assembly in AUTO position and stop requested (sensor malfunction)	w/ Auto Wiper System
Rain Sensor	Rain sensor detection information	With or Without	With: w/ Rain Sensor Without: w/o Rain Sensor	w/ Auto Wiper System
Wiper LO Single Operation Signal	Wiper LO single operation signal	With or Without	With: Windshield wiper switch assembly in AUTO position and sensor determines small amount of rain while wiper is in stopped position Without: Windshield wiper switch assembly in AUTO position and wiper in position other than stopped	w/ Auto Wiper System
Communication Wiper ECU	Connection status between windshield wiper motor assembly and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	Although this item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Communication Wiper Module	Connection status between windshield wiper relay assembly and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	DTCs are stored if a malfunction occurs in the CXPI communication system.
Communication Humidity/Rain Sensor	Connection status between rain sensor and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	w/ Auto Wiper System
R Wiper Stop Function at Back Door/Trunk Lid Open	Function to enable the back door open linked rear wiper suspend function	Enable or Disable	Customize setting displayed	Although this item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Auto Wiper Function	Function to enable the auto wiper function	Enable or Disable	Customize setting displayed	-
Wiper Voice Control Function	Function to enable the voice recognition function	Enable or Disable	Customize setting displayed	-

*: Refer to Inspection for each position of the switch.
Click here

Body Electrical > Combination Meter > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Washer Level Warning Switch	Washer fluid level warning switch status	Washer Level Switch ON, Washer Level Switch OFF or Unknown	Washer Level Switch ON: Washer fluid level not low Washer Level Switch OFF: Washer fluid level low Unknown: Washer fluid level not detected	-
Wiper Switch	Front wiper switch OFF position signal	OFF or ON	OFF: Front wiper switch not in OFF position ON: Front wiper switch in OFF position	-
Wiper Switch (AUTO/INT)	Front wiper switch AUTO1 or INT2 position signal	OFF or ON	OFF: Front wiper switch not in AUTO1 or INT2 position ON: Front wiper switch in AUTO1 or INT2 position	-
Wiper Switch (LO)	Front wiper switch LO position signal	OFF or ON	OFF: Front wiper switch not in LO position ON: Front wiper switch in LO position	-
Wiper Switch (HI)	Front wiper switch HI position signal	OFF or ON	OFF: Front wiper switch not in HI position ON: Front wiper switch in HI position	-
Wiper Switch (MIST)	Front wiper switch MIST position signal	OFF or ON	OFF: Front wiper switch not in MIST position ON: Front wiper switch in MIST position	-
Washer Switch	Washer switch Fr WASH position signal	OFF or ON	OFF: Washer switch not in Fr WASH position ON: Washer switch in Fr WASH position	-
Wiper Switch (Intermittent)	Front wiper switch INT position signal	OFF or ON	OFF: Front wiper switch not in INT ON: Front wiper switch in INT	*2
Rear Wiper Switch	Rear wiper switch position signal	OFF or ON	OFF: Rear wiper switch not in ON position ON: Rear wiper switch in ON position	Although this item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Rear Washer Switch	Washer switch Rr WASH position signal	OFF or ON	OFF: Washer switch not in Rr WASH position ON: Washer switch in Rr WASH position	*3
Wiper Speed (FAST)	Intermittent time adjustment volume condition	OFF or ON	OFF: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) not in P4 position ON: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) in P4 position	*4
Wiper Speed (2nd FAST)	Intermittent time adjustment volume condition	OFF or ON	OFF: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) not in P3 position ON: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) in P3 position	*4
Wiper Speed (3rd FAST)	Intermittent time adjustment volume condition	OFF or ON	OFF: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) not in P2 position ON: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) in P2 position	*4
Wiper Speed (SLOW)	Intermittent time adjustment volume condition	OFF or ON	OFF: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) not in P1 position ON: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) in P1 position	*4

*1: w/ Auto Wiper System
*2: w/o Auto Wiper System
*3: w/ Rear Camera Cleaner System
*4: Refer to Inspection for each position of the switch.
Click here

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 > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Wiper Power Relay	Function to operate the windshield wiper relay	OFF or ON	-
Front Washer Relay	Function to operate the windshield washer motor and pump assembly (Front)	OFF or ON	-
Front Wiper Lo Operation	Function to operate the windshield wiper motor assembly in LO	OFF or ON	-
Front Wiper Hi Operation	Function to operate the windshield wiper motor assembly in HI	OFF or ON	-
Rear Washer Relay	Function to operate the windshield washer motor and pump assembly (Rear)	OFF or ON	-

Humidity/Rain Sensor Missing Message (B127987)

DESCRIPTION

The main body ECU (multiplex network body ECU) and rain sensor communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B127987	Humidity/Rain Sensor Missing Message	Detection Condition: Auxiliary battery voltage is 9.5 V or more Malfunction Status: Communication malfunction with rain sensor Malfunction Duration: 10 seconds or more	Rain sensor Harness or connector Main body ECU (multiplex network body ECU)	○	Main Body	A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
Only B127987 is output	A
B127987 and B276C88 are output	B

GO TO DTC B276C88

2.	CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - RAIN SENSOR)

Pre-procedure1

(a) Disconnect the K16 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the U4 rain sensor connector.

Procedure1

Standard Resistance:

Click Location & Routing(K16,U4) Click Connector(K16) Click Connector(U4)

Tester Connection	Condition	Specified Condition	Result
K16-11 (LIN4) - U4-3 (MPX)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Check for pulses according to the value(s) in the table below.

Standard Pulse:

Click Location & Routing(K16) Click Connector(K16)

Tester Connection	Condition	Specified Condition
K16-11 (LIN4) - Body ground	Ignition switch ON	Pulse generation

*a	Component without harness connected (Main Body ECU (Multiplex Network Body ECU)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

4.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - RAIN SENSOR)

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

Standard Voltage:

Click Location & Routing(U4) Click Connector(U4)

Tester Connection	Condition	Specified Condition	Result
U4-4 (SIG) - Body ground	Ignition switch ON	11 to 14 V	V

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BODY GROUND)

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

Standard Resistance:

Click Location & Routing(U4) Click Connector(U4)

Tester Connection	Condition	Specified Condition	Result
U4-2 (ES) - Body ground	Always	Below 1 Ω	Ω

REPLACE RAIN SENSOR

REPAIR OR REPLACE HARNESS OR CONNECTOR

Rain Sensor Component Internal Failure (B140096)

DESCRIPTION

This DTC is stored when the rain sensor detects an internal malfunction.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B140096	Rain Sensor Component Internal Failure	Detection Condition: IG power source voltage is 9.5 V or more Malfunction Status: Either of the following is detected Rain sensor internal thermistor malfunction detected for 10 seconds or more LED output malfunction detected for 2 seconds or more	Rain sensor	○	Main Body	A

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

2.	CHECK FOR DTC

(a) Read the DTCs.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
B140096 is not output	A
B140096 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE RAIN SENSOR

Wiper Module Missing Message (B235787)

DESCRIPTION

The main body ECU (multiplex network body ECU) and windshield wiper relay assembly communicate via CXPI communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B235787	Wiper Module Missing Message	Detection condition: Auxiliary battery voltage is 9.5 V or more Malfunction Status: Communication malfunction between the main body ECU (multiplex network body ECU) and windshield wiper relay assembly Malfunction Time: 10 seconds or more	Windshield wiper relay assembly Main body ECU (multiplex network body ECU) Harness or connector WIPER relay Power distribution box assembly	○	Main Body	A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses of circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

Pre-procedure1

(a) Disconnect the A56 windshield wiper relay assembly connector.

(b) Disconnect the A12 power distribution box assembly connector.

Procedure1

Standard Resistance:

Click Location & Routing(A56,A12) Click Connector(A56) Click Connector(A12)

Tester Connection	Condition	Specified Condition
A56-4 (MPX1) - A12-5	Always	Below 1 Ω
A56-4 (MPX1) or A12-5 - Body ground	Always	10 kΩ or higher

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Check for voltage and pulses according to the value(s) in the table below.

Standard Voltage and Pulse:

Click Location & Routing(A12) Click Connector(A12)

Tester Connection	Condition	Specified Condition
A12-5 - Body ground	Ignition switch ON	Pulse generation
A12-5 - Body ground	Ignition switch off	Below 1 V

*a	Component without harness connected (Power Distribution Box Assembly)

GO TO STEP 12

3.	PERFORM ACTIVE TEST USING GTS

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

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Wiper Power Relay	Function to operate the Windshield Wiper relay	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Wiper Power Relay

OK:

Windshield Wiper relay operates normally.

GO TO STEP 9

4.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - BODY GROUND)

Pre-procedure1

(a) Disconnect the A55 windshield wiper relay assembly connector.

Procedure1

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

Standard Resistance:

Click Location & Routing(A55,A56) Click Connector(A55) Click Connector(A56)

Tester Connection	Condition	Specified Condition
A55-3 (E) - Body ground	Always	Below 1 Ω
A56-5 (ES) - Body ground	Always	Below 1 Ω

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER RELAY ASSEMBLY)

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

Standard Voltage:

Click Location & Routing(A55) Click Connector(A55)

Tester Connection	Condition	Specified Condition
A55-8 ( B) - Body ground	Ignition switch ON	11 to 14 V
	Less than approximately 60 seconds after ignition switch turned off	11 to 14 V
	Approximately 60 seconds or more after ignition switch turned off	Below 1 V

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

6.	INSPECT WINDSHIELD WIPER RELAY

HINT:

Click here

REPLACE WINDSHIELD WIPER RELAY

7.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER RELAY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
5 (Windshield Wiper Relay) - Body ground	Ignition switch off	11 to 14 V

*1	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - WINDSHIELD WIPER RELAY)

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

Standard Resistance:

Click Location & Routing(A55) Click Connector(A55)

Tester Connection	Condition	Specified Condition
A55-8 ( B) - 3 (Windshield Wiper Relay)	Always	Below 1 Ω
A55-8 ( B) or 3 (Windshield Wiper Relay) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	INSPECT WINDSHIELD WIPER RELAY

HINT:

Click here

REPLACE WINDSHIELD WIPER RELAY

10.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

Pre-procedure1

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

Procedure1

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

Standard Resistance:

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

Tester Connection	Condition	Specified Condition
2 (Windshield Wiper Relay) - K17-6 (WPS)	Always	Below 1 Ω
2(Windshield Wiper Relay) or K17-6 (WPS) - Body ground	Always	10 kΩ or higher

Result:

Proceed to
OK
NG

*1	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY - BODY GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (Windshield Wiper Relay) - Body ground	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	CHECK POWER DISTRIBUTION BOX ASSEMBLY

Pre-procedure1

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

HINT:

Click here

Procedure1

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

Standard Resistance:

Click Location & Routing(A12,z1) Click Connector(A12) Click Connector(z1)

Tester Connection	Condition	Specified Condition
A12-5 - z1-22 (CXP1)	Always	Below 1 Ω
A12-5 or z1-22 (CXP1) - Body ground	Always	10 kΩ or higher

Result:

Pre-procedure1

Proceed to
OK
NG

*a	Component without harness connected (Power Distribution Box Assembly)

Post-procedure1

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Front Wiper Motor Circuit

DESCRIPTION

The windshield wiper relay assembly controls the windshield wiper motor assembly through this circuit.

WIRING DIAGRAM

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS

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

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Front Wiper Lo Operation	Function to operate the windshield wiper motor assembly in LO	OFF or ON	-
Front Wiper Hi Operation	Function to operate the windshield wiper motor assembly in HI	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Front Wiper Lo Operation

Body Electrical > Main Body > Active Test

Tester Display
Front Wiper Hi Operation

OK:

Windshield wiper motor assembly operates normally.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY

(a) Remove the windshield wiper motor assembly.

Click here

(b) Inspect the windshield wiper motor assembly.

Click here

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - WINDSHIELD WIPER MOTOR ASSEMBLY)

(a) Disconnect the A55 and A56 windshield wiper relay assembly connectors.

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

Standard Resistance:

for 2ZR-FXE

Click Location & Routing(A55,A43,A56) Click Connector(A55) Click Connector(A43) Click Connector(A56)

Tester Connection	Condition	Specified Condition
A55-2 ( 1) - A43-1 ( 1)	Always	Below 1 Ω
A55-4 ( 2) - A43-4 ( 2)	Always	Below 1 Ω
A56-6 ( SM) - A43-3 ( S)	Always	Below 1 Ω
A55-2 ( 1) or A43-1 ( 1) - Body ground	Always	10 kΩ or higher
A55-4 ( 2) or A43-4 ( 2) - Body ground	Always	10 kΩ or higher
A56-6 ( SM) or A43-3 ( S) - Body ground	Always	10 kΩ or higher

Standard Resistance:

for M20A-FXS

Click Location & Routing(A55,A44,A56) Click Connector(A55) Click Connector(A44) Click Connector(A56)

Tester Connection	Condition	Specified Condition
A55-2 ( 1) - A44-5 ( 1)	Always	Below 1 Ω
A55-4 ( 2) - A44-3 ( 2)	Always	Below 1 Ω
A56-6 ( SM) - A44-1 ( S)	Always	Below 1 Ω
A55-2 ( 1) or A44-5 ( 1) - Body ground	Always	10 kΩ or higher
A55-4 ( 2) or A44-3 ( 2) - Body ground	Always	10 kΩ or higher
A56-6 ( SM) or A44-1 ( S) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - BODY GROUND)

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

Standard Resistance:

for 2ZR-FXE

Click Location & Routing(A43) Click Connector(A43)

Tester Connection	Condition	Specified Condition
A43-5 (E) - Body ground	Always	Below 1 Ω

Standard Resistance:

for M20A-FXS

Click Location & Routing(A44) Click Connector(A44)

Tester Connection	Condition	Specified Condition
A44-4 (E) - Body ground	Always	Below 1 Ω

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Wiper and Washer Switch Circuit

DESCRIPTION

The condition of the windshield wiper switch assembly is detected and sent to the steering sensor in this circuit.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING GTS

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

Body Electrical > Combination Meter > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Wiper Switch	Front wiper switch OFF position signal	OFF or ON	OFF: Front wiper switch not in OFF position ON: Front wiper switch in OFF position	-
Wiper Switch (AUTO/INT)	Front wiper switch AUTO1 or INT2 position signal	OFF or ON	OFF: Front wiper switch not in AUTO1 or INT2 position ON: Front wiper switch in AUTO1 or INT2 position	-
Wiper Switch (LO)	Front wiper switch LO position signal	OFF or ON	OFF: Front wiper switch not in LO position ON: Front wiper switch in LO position	-
Wiper Switch (HI)	Front wiper switch HI position signal	OFF or ON	OFF: Front wiper switch not in HI position ON: Front wiper switch in HI position	-
Wiper Switch (MIST)	Front wiper switch MIST position signal	OFF or ON	OFF: Front wiper switch not in MIST position ON: Front wiper switch in MIST position	-
Washer Switch	Washer switch Fr WASH position signal	OFF or ON	OFF: Washer switch not in Fr WASH position ON: Washer switch in Fr WASH position	-
Wiper Switch (Intermittent)	Front wiper switch INT position signal	OFF or ON	OFF: Front wiper switch not in INT ON: Front wiper switch in INT	*2
Rear Wiper Switch	Rear wiper switch position signal	OFF or ON	OFF: Rear wiper switch not in ON position ON: Rear wiper switch in ON position	Although this item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Rear Washer Switch	Washer switch Rr WASH position signal	OFF or ON	OFF: Washer switch not in Rr WASH position ON: Washer switch in Rr WASH position	-
Wiper Speed (FAST)	Intermittent time adjustment volume condition	OFF or ON	OFF: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) not in P4 position ON: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) in P4 position	*3
Wiper Speed (2nd FAST)	Intermittent time adjustment volume condition	OFF or ON	OFF: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) not in P3 position ON: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) in P3 position	*3
Wiper Speed (3rd FAST)	Intermittent time adjustment volume condition	OFF or ON	OFF: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) not in P2 position ON: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) in P2 position	*3
Wiper Speed (SLOW)	Intermittent time adjustment volume condition	OFF or ON	OFF: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) not in P1 position ON: Windshield wiper switch assembly (auto sensitivity adjustment volume condition) in P1 position	*3

*1: w/ Auto Wiper System
*2: w/o Auto Wiper System
*3: Refer to Inspection for each position of the switch.
Click here

Body Electrical > Combination Meter > Data List

Tester Display
Wiper Switch
Wiper Switch (AUTO/INT)
Wiper Switch (LO)
Wiper Switch (HI)
Wiper Switch (MIST)
Washer Switch
Wiper Switch (Intermittent)
Rear Wiper Switch
Rear Washer Switch
Wiper Speed (FAST)
Wiper Speed (2nd FAST)
Wiper Speed (3rd FAST)
Wiper Speed (SLOW)

OK:

The GTS display changes correctly in response to the windshield wiper switch assembly operation.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

(a) Remove the windshield wiper switch assembly.

Click here

(b) Inspect the windshield wiper switch assembly.

Click here

REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY

3.	INSPECT STEERING WHEEL SWITCH HOUSING

(a) Remove the steering wheel switch housing.

Click here

(b) Inspect the steering wheel switch housing.

Click here

REPLACE STEERING WHEEL SWITCH HOUSING

4.	CHECK HARNESS AND CONNECTOR (STEERING SENSOR - WINDSHIELD WIPER RELAY ASSEMBLY)

(a) Disconnect the A56 windshield wiper relay assembly connector.

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

Standard Resistance:

Click Location & Routing(K72,A56) Click Connector(K72) Click Connector(A56)

Tester Connection	Condition	Specified Condition
K72-2 (2S) - A56-3 (2S)	Always	Below 1 Ω
K72-2 (2S) or A56-3 (2S) - Body ground	Always	10 kΩ or higher

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Rear Cleaner Motor and Relay Circuit

DESCRIPTION

When the main body ECU (multiplex network body ECU) receives a washer switch (Rr CAMERA WASH) signal from the windshield wiper switch assembly, the windshield washer motor and pump assembly operates to spray the windshield washer.

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

First check that the windshield washer function operates normally.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.
If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS

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

Click here

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Rear Washer Relay	Operates the windshield washer motor and pump assembly	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Rear Washer Relay

OK:

The windshield washer motor and pump assembly is operate normally.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY

(a) Remove the windshield washer motor and pump assembly.

Click here

(b) Inspect the windshield washer motor and pump assembly.

Click here

REPLACE WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER RELAY ASSEMBLY)

(a) Disconnect the A55 windshield wiper relay assembly connector.

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

Standard Voltage:

Click Location & Routing(A55) Click Connector(A55)

Tester Connection	Condition	Specified Condition
A55-6 (IGWS) - Body ground	Ignition switch ON	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - BODY GROUND)

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

Standard Resistance:

Click Location & Routing(A55) Click Connector(A55)

Tester Connection	Condition	Specified Condition
A55-5 (EWS) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY)

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

Standard Resistance:

Click Location & Routing(A55,A46) Click Connector(A55) Click Connector(A46)

Tester Connection	Condition	Specified Condition
A55-1 ( WR) - A46-1 (B)	Always	Below 1 Ω
A55-7 (-WR) - A46-2 (SW)	Always	Below 1 Ω
A55-1 ( WR) or A46-1 (B) - Body ground	Always	10 kΩ or higher
A55-7 (-WR) or A46-2 (SW) - Body ground	Always	10 kΩ or higher

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Washer Fluid Level Warning Switch Circuit

DESCRIPTION

When the washer fluid level is lower than a certain level, a warning message is displayed on the combination meter assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another Toyota Prius vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

The wiper and washer system uses the CAN and CXPI communication system. First, confirm that there is no malfunction in the CAN and CXPI communication system.

PROCEDURE

1.	READ VALUE USING GTS

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

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Washer Level Warning Switch

Washer fluid level warning switch status

Washer Level Switch ON, Washer Level Switch OFF or Unknown

Washer Level Switch ON: Washer fluid level not low

Washer Level Switch OFF: Washer fluid level low

Unknown: Washer fluid level not detected

Body Electrical > Combination Meter > Data List

Tester Display
Washer Level Warning Switch

OK:

The GTS display changes correctly in response to the washer fluid level warning switch status.

REPLACE COMBINATION METER ASSEMBLY

2.	INSPECT LEVEL WARNING SWITCH

(a) Inspect the level warning switch assembly.

(1) This check should be performed with the level warning switch installed to the windshield washer jar assembly and fill the washer jar with washer fluid.

*a	Component without harness connected (Level Warning Switch Assembly)

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

Standard Resistance:

Click Location & Routing(A45) Click Connector(A45)

Tester Connection	Condition	Specified Condition
A45-1(S) - A45-2(E)	Fluid volume is 600 to 800 cc (36.6 to 48.8 cu. in.) or higher*	10 kΩ or higher
A45-1(S) - A45-2(E)	Fluid volume is 600 to 800 cc (36.6 to 48.8 cu. in.) or lower*	Below 1 Ω

HINT:

Perform checks by reducing the amount of washer fluid.
*: The level warning switch assembly begins operating when the fluid volume is 600 to 800 cc (36.6 to 48.8 cu. in.) depending on the Toyota Prius vehicle condition.