Toyota 4Runner: Rear Washer does not Operate

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

DESCRIPTION

The windshield wiper switch controls the rear washer motor and pump.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	READ VALUE USING TECHSTREAM (WINDSHIELD WIPER SWITCH)

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

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Rear Washer SW Signal	Rear washer switch / ON or OFF	ON: Rear washer switch on OFF: Rear washer switch off	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Rear Washer SW Signal

Rear washer switch / ON or OFF

ON: Rear washer switch on

OFF: Rear washer switch off

OK:

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

GO TO STEP 9

2.	PERFORM ACTIVE TEST USING TECHSTREAM (WASHER RR RELAY)

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

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Rear Wiper Washer Motor Relay	WASHER RR relay operation	ON/OFF	-

OK:

The rear washer motor operates normally.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

3.	INSPECT WASHER RR RELAY

(a) Remove the WASHER RR relay from the engine room relay block, junction block.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
3 - 5	Battery voltage is applied to terminals 1 and 2	Below 1 Ω

REPLACE WASHER RR RELAY

4.	CHECK HARNESS AND CONNECTOR (BATTERY - WASHER RR RELAY)

(a) Remove the WASHER RR relay from the engine room relay block, junction block.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
RR WASHER relay terminal 2 - Body ground	Ignition switch ON	11 to 14 V
RR WASHER relay terminal 2 - Body ground	Ignition switch off	Below 1 V
RR WASHER relay terminal 5 - Body ground	Ignition switch ON	11 to 14 V
RR WASHER relay terminal 5 - Body ground	Ignition switch off	Below 1 V

Text in Illustration

*a	Front view of wire harness connector (to WASHER RR Relay)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (WASHER RR RELAY - MAIN BODY ECU)

(a) Remove the WASHER RR relay from the engine room relay block, junction block.

(b) Disconnect the F8 main body ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F8-2 (BW) - WASHER RR relay terminal 1	Always	Below 1 Ω
F8-2 (BW) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT REAR WASHER MOTOR AND PUMP ASSEMBLY

(a) Remove the rear washer motor and pump (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 (+) → 1 Battery negative (-) → 2	Rear washer motor operation is normal

Measurement Condition

Specified Condition

Battery positive (+) → 1

Battery negative (-) → 2

Rear washer motor operation is normal

REPLACE REAR WASHER MOTOR AND PUMP ASSEMBLY

7.	CHECK WIRE HARNESS (REAR WASHER MOTOR AND PUMP ASSEMBLY)

(a) Disconnect the A27 level warning switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A27-5 - 1	Always	Below 1 Ω
A27-4 - 2	Always	Below 1 Ω
A27-5 - Body ground	Always	10 kΩ or higher
A27-4 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (REAR WASHER MOTOR AND PUMP ASSEMBLY - WASHER RR RELAY AND BODY GROUND)

(a) Disconnect the A27 rear washer motor connector.

(b) Remove the WASHER RR relay from the engine room relay block, junction block.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A27-5 - WASHER RR relay terminal 3	Always	Below 1 Ω
A27-4 - Body ground	Always	Below 1 Ω
A27-5 - 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 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
B-5 (WR) - A-2 (EW)	Rear washer switch on	Below 1 Ω
B-5 (WR) - A-2 (EW)	Rear washer switch off	10 kΩ or higher

REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY

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

(a) Disconnect the F20 and F21 windshield wiper switch connectors.

(b) Disconnect the F10 main body ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F21-5 (WR) - F10-8 (RWSW)	Always	Below 1 Ω
F20-2 (EW) - Body ground	Always	Below 1 Ω
F21-5 (WR) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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