Pinpoint Test F: The Washer Pump is Inoperative

Wipers and Washers

Pinpoint Test F: The Washer Pump is Inoperative

Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

The multifunction switch provides a ground signal to the wiper/washer module through circuit CRW07 (GY/BN) when the wash function is selected on the multifunction switch. When the wiper/washer module detects this input, the wiper/washer module activates an internal washer relay that provides voltage to the washer pump through circuit CRW14 (BU/WH). The washer pump is grounded through circuit GD123 (BK/GY).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Blocked washer hose/washer jet

- Multifunction switch

- Washer pump motor

- Wiper/washer module

PINPOINT TEST F : THE WASHER PUMP IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

F1 CHECK WASHER PUMP MOTOR FOR GROUND

- Disconnect: Washer Pump Motor C137.

- Ignition OFF.

- Measure the resistance between washer pump motor C137-2, circuit GD123 (BK/GY) harness side and ground.





Is the resistance less than 5 ohms?

Yes
GO to F2.

No
REPAIR the circuit. TEST the system for normal operation.

F2 CHECK WASHER PUMP MOTOR FOR VOLTAGE

- Ignition ON.

- Measure the voltage between washer pump motor C137-1, circuit CRW14 (BU/WH), harness side and ground while depressing the multifunction switch to the WASH position.





Is the voltage greater than 10 volts?

Yes
INSTALL a new washer pump. REFER to Washer Pump .

No
GO to F3.

F3 CHECK WASHER PUMP MOTOR VOLTAGE CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Wiper/Washer Module C2157.

- Measure the resistance between wiper/washer module C2157-3, circuit CRW14 (BU/WH), harness side and washer pump motor C137-1, circuit CRW14 (BU/WH), harness side.





Is the resistance less than 5 ohms?

Yes
GO to F4.

No
REPAIR the circuit. TEST the system for normal operation.

F4 CHECK MULTIFUNCTION SWITCH WASHER OUTPUT CIRCUIT

- Measure the resistance between wiper/washer module C2157-5, circuit CRW07 (GY/BN) harness side and ground while depressing the multifunction switch to the WASH position.





Is the resistance less than 5 ohms?

Yes
GO to F6.

No
GO to F5.

F5 CHECK MULTIFUNCTION SWITCH OUTPUT CIRCUIT FOR AN OPEN

- Disconnect: Multifunction Switch C202.

- Measure the resistance between wiper/washer module C2157-5, circuit CRW07 (GY/BN), harness side and multifunction switch C202-10, circuit CRW07 (GY/BN), harness side.





Is the resistance less than 5 ohms?

Yes
INSTALL a new multifunction switch. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

F6 CHECK FOR CORRECT WIPER/WASHER MODULE OPERATION

- Disconnect all wiper/washer module connectors.

- Check for:
- corrosion.

- pushed-out pins.


- Connect all wiper/washer module connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new wiper/washer module. REFER to Wiper/Washer Module .

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation.