Toyota 4Runner: Rear Wiper does not Operate

Toyota 4Runner Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Rear Wiper does not Operate

DESCRIPTION

The windshield wiper switch controls the rear wiper motor.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Since the wiper and washer system has functions that use LIN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (WIPER AND BACK DOOR POWER WINDOW POSITION)

(a) Use the Data List to check if the rear wiper and back power window are functioning properly (See page ).

Back Door P/W

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Wiper Retracted Position	Rear wiper retracting switch signal / ON or OFF	ON: Rear wiper in retracting position OFF: Rear wiper in other position	-
Wiper Reverse Position	Rear wiper reverse position switch signal / ON or OFF	ON: Rear wiper in reverse position OFF: Rear wiper in other position	-
Back Door P/W Status	Back door power window position / Open or Close	Open: Back door window open Close: Back door window closed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Wiper Retracted Position

Rear wiper retracting switch signal / ON or OFF

ON: Rear wiper in retracting position

OFF: Rear wiper in other position

Wiper Reverse Position

Rear wiper reverse position switch signal / ON or OFF

ON: Rear wiper in reverse position

OFF: Rear wiper in other position

Back Door P/W Status

Back door power window position / Open or Close

Open: Back door window open

Close: Back door window closed

OK:

On the Techstream screen, each item changes between ON and OFF according to the above chart.

Result

Result	Proceed to
OK	A
NG (Rear wiper position)	B
NG (Back door power window position)	C

GO TO STEP 4

GO TO POWER WINDOW CONTROL SYSTEM

2.	READ VALUE USING TECHSTREAM (WINDSHIELD WIPER SWITCH)

(a) Use the Data List to check if the rear wiper is functioning properly (See page ).

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Rear Wiper HI SW Signal	Rear wiper HI switch / ON or OFF	ON: Rear wiper switch in HI position OFF: Rear wiper switch not in HI position	-
Rear Wiper LO SW Signal	Rear wiper LO switch / ON or OFF	ON: Rear wiper switch in LO position OFF: Rear wiper switch not in LO position	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Rear Wiper HI SW Signal

Rear wiper HI switch / ON or OFF

ON: Rear wiper switch in HI position

OFF: Rear wiper switch not in HI position

Rear Wiper LO SW Signal

Rear wiper LO switch / ON or OFF

ON: Rear wiper switch in LO position

OFF: Rear wiper switch not in LO position

OK:

On the Techstream screen, each item changes between ON and OFF according to the above chart.

GO TO STEP 6

3.	PERFORM ACTIVE TEST USING TECHSTREAM (REAR WIPER)

(a) Using the Techstream, perform the Active Test (See page ).

Back Door P/W

Tester Display	Test Part	Control Range	Diagnostic Note
Rear Wiper Active	Rear wiper motor operation	STOP/ACTIVE	-

OK:

The rear wiper motor operates normally.

REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

GO TO STEP 8

4.	CHECK MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

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

Standard Voltage:

Tester Connection	Tool Setting	Switch Condition	Specified Condition
V2-3 (W) - V2-12 (SGND)	5 V/DIV., 10 ms/DIV.	Ignition switch ON and rear wiper switch on (rear wiper reverse position switch off)	Pulse generation (See waveform 1)
V2-3 (W) - V2-12 (SGND)	5 V/DIV., 10 ms/DIV.	Ignition switch ON and rear wiper switch on (rear wiper reverse position switch on)	Pulse generation (See waveform 2)
V2-4 (P) - V2-12 (SGND)	5 V/DIV., 10 ms/DIV.	Ignition switch ON and rear wiper switch on (rear wiper retractable position switch off)	Pulse generation (See waveform 1)
V2-4 (P) - V2-12 (SGND)	5 V/DIV., 10 ms/DIV.	Ignition switch ON and rear wiper switch on (rear wiper retractable position switch on)	Pulse generation (See waveform 2)

REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

5.	CHECK HARNESS AND CONNECTOR (REAR WIPER MOTOR ASSEMBLY - MULTIPLEX NETWORK DOOR ECU)

(a) Disconnect the V1 rear wiper motor connector.

(b) Disconnect the V2 multiplex network door ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
V1-3 (W) - V2-3 (W)	Always	Below 1 Ω
V1-1 (P) - V2-4 (P)	Always	Below 1 Ω
V1-2 (E) - V2-12 (SGND)	Always	Below 1 Ω
V1-3 (W) - Body ground	Always	10 kΩ or higher
V1-1 (P) - Body ground	Always	10 kΩ or higher
V1-2 (E) - Body ground	Always	10 kΩ or higher

REPLACE REAR WIPER MOTOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

(a) Remove the windshield wiper switch (See page ).

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
A-6 (C1R) - A-2 (EW)	Rear wiper switch LO	Below 1 Ω
A-7 (+1R) - A-2 (EW)	Rear wiper switch HI	Below 1 Ω
A-6 (C1R) - A-2 (EW)	Rear wiper switch off	10 kΩ or higher
A-7 (+1R) - A-2 (EW)	Rear wiper switch off	10 kΩ or higher
A-6 (C1R) - A-7 (+1R)	Rear wiper switch off	10 kΩ or higher

REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY - MAIN BODY ECU AND BODY GROUND)

(a) Disconnect the F20 windshield wiper switch connector.

(b) Disconnect the F9 and F10 main body ECU connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F20-7 (+1R) - F10-17 (RWLS)	Always	Below 1 Ω
F20-6 (C1R) - F9-1 (RWC1)	Always	Below 1 Ω
F20-2 (EW) - Body ground	Always	Below 1 Ω
F20-7 (+1R) - Body ground	Always	10 kΩ or higher
F20-6 (C1R) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT REAR WIPER MOTOR ASSEMBLY

(a) Remove the rear wiper motor (See page ).

(b) Apply battery voltage to the rear wiper motor and check the operation of the rear wiper motor.

OK:

Measurement Condition	Specified Condition
Battery positive (+) → 5 (L) Battery negative (-) → 4 (E)	Rear wiper motor operation is normal

Measurement Condition

Specified Condition

Battery positive (+) → 5 (L)

Battery negative (-) → 4 (E)

Rear wiper motor operation is normal

REPLACE REAR WIPER MOTOR ASSEMBLY

9.	CHECK HARNESS AND CONNECTOR (REAR WIPER MOTOR ASSEMBLY - MULTIPLEX NETWORK DOOR ECU)

(a) Disconnect the V1 rear wiper motor connector.

(b) Disconnect the V2 multiplex network door ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
V1-5 (L) - V2-2 (WIP+)	Always	Below 1 Ω
V1-4 (E) - V2-5 (WIP-)	Always	Below 1 Ω
V1-5 (L) - Body ground	Always	10 kΩ or higher
V1-4 (E) - Body ground	Always	10 kΩ or higher

REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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