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Pinpoint Test H: The Washer Pump is Inoperative Or Always On - Vehicles Equipped With Front Video Camera




Wipers and Washers

Pinpoint Test H: The Washer Pump is Inoperative Or Always On - Vehicles Equipped With Front Video Camera

Normal Operation

When the multifunction switch is placed in the WASH position, the Steering Column Control Module (SCCM) sends the request to the windshield wiper motor through the Local Interconnect Network (LIN). The wiper motor then supplies power to the washer pump, which directs washer fluid to the windshield. When the front camera washer control is activated, the Steering Column Control Module (SCCM) sends the request to the windshield wiper motor through the Local Interconnect Network (LIN). The windshield wiper motor controls the direction of the washer pump to direct washer fluid to the front video camera.

When a windshield wash is requested, the windshield wiper motor supplies voltage to the washer pump. Ground is provided to the washer pump through the normally closed contact in the front camera washer relay (located in the auxiliary BJB (Battery Junction Box) ).

When a front camera wash is requested, the windshield wiper motor activates the front camera washer relay. When the front camera washer relay is energized, it provides voltage to the washer pump. Ground is provided to the washer pump through the windshield wiper motor.

This pinpoint test is intended to diagnose the following:

- Fuse

- Front camera washer relay

- SCCM (Steering Column Control Module)

- Washer pump

- Wiring, terminals or connectors

- Multifunction switch

- Windshield wiper motor

PINPOINT TEST H : THE WASHER PUMP IS INOPERATIVE OR ALWAYS ON - VEHICLES EQUIPPED WITH FRONT VIDEO CAMERA

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.

H1 CHECK THE MULTIFUNCTION SWITCH (F_WASH_SW) AND (F_CAMRA_WASHSW) PIDs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: DataLogger- SCCM (Steering Column Control Module).

- While monitoring the SCCM (Steering Column Control Module) F_WASH_SW PID, place the multifunction switch into the windshield wiper WASH position.

- While monitoring the SCCM (Steering Column Control Module) F_CAMRA_WASHSW PID, rotate the front camera washer control to the WASH position.

Do each of the PIDs change to the ON state when the multifunction switch and front camera washer control are in the applicable WASH positions?

Yes
If a washer function is inoperative, GO to H2.

If the windshield washer function is always on, GO to H12.

If the front camera washer function is always on, GO to H13.

No
INSTALL a new multifunction switch. TEST the system for normal operation.

If the concern is still present, INSTALL a new SCCM (Steering Column Control Module). TEST the system for normal operation.

H2 CHECK THE WINDSHIELD WASH FUNCTION

- Ignition ON.

- Attempt to operate the windshield wash function.

Does the washer pump operate in the windshield WASH position?

Yes
GO to H8.
No
GO to H3.

H3 CHECK THE WASHER PUMP CONTROL CIRCUIT FOR AN OPEN

NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.

- Ignition OFF.

- Disconnect: Washer Pump Motor C137.

- Connect a 12-volt incandescent test light between the positive battery post and the washer pump motor C137-1, circuit CRW24 (BU/WH), harness side.






Does the test light illuminate?

Yes
GO to H6.
No
GO to H4.

H4 CHECK THE FRONT CAMERA WASHER RELAY (WINDSHIELD WASH)

- Disconnect: Front Camera Washer Relay.

- Carry out the front camera washer relay component test.


Did the front camera washer relay pass the component test?

Yes
GO to H5.
No
INSTALL a new front camera washer relay. TEST the system for normal operation.

H5 CHECK THE FRONT CAMERA WASHER RELAY GROUND CIRCUIT FOR AN OPEN

- Measure the resistance between the camera washer relay socket pin 4, circuit GD120 (BK/GN) and ground.






Is the resistance less than 3 ohms?

Yes
REPAIR circuit CRW24 (BU/WH) for an open. TEST the system for normal operation.
No
REPAIR circuit GD120 (BK/GN) for an open. TEST the system for normal operation.

H6 CHECK THE WASHER PUMP CONTROL CIRCUIT FOR AN OPEN

NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.

- Ignition ON.

- Connect a 12-volt incandescent test light between the washer pump motor C137-1, circuit CRW24 (BU/WH), harness side and the washer pump motor C137-2, circuit CRW14 (GY), harness side.






- Observe the test light while placing the multifunction switch into the windshield WASH position.

Does the test light illuminate when WASH is selected?

Yes
INSTALL a new washer pump. REFER to Washer Pump . TEST the system for normal operation.
No
GO to H7.

H7 CHECK THE WASHER PUMP CONTROL CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Windshield Wiper Motor C125.

- Measure the resistance between the washer pump C137-2, circuit CRW14 (GY), harness side and the windshield wiper motor C125-7, circuit CRW14 (GY), harness side.






Is the resistance less than 3 ohms?

Yes
INSTALL a new windshield wiper motor. REFER to Wiper Motor . TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.

H8 CHECK THE WINDSHIELD WIPER MOTOR FOR AN INTERNAL OPEN

NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.

- Ignition OFF.

- Disconnect: Washer Pump Motor C137.

- Connect a 12-volt incandescent test light between the positive battery post and the washer pump motor C137-2, circuit CRW14 (GY), harness side.






Does the test light illuminate?

Yes
GO to H9.
No
INSTALL a new windshield wiper motor. REFER to Wiper Motor . TEST the system for normal operation.

H9 CHECK THE FRONT CAMERA WASHER RELAY (INOPERATIVE)

- Disconnect: Front Camera Washer Relay.

- Carry out the front camera washer relay component test.


Did the front camera washer relay pass the component test?

Yes
GO to H10.
No
INSTALL a new front camera washer relay. TEST the system for normal operation.

H10 CHECK FOR VOLTAGE TO THE FRONT CAMERA WASHER RELAY

- Ignition ON.

- Measure the voltage between the front camera washer relay socket pin 1, circuit CBB54 (VT/OG) and ground; and between the front camera washer relay socket pin 5, circuit SBB41 (RD) and ground.






Are the voltages greater than 11?

Yes
GO to H11.
No
VERIFY BJB (Battery Junction Box) fuses 41 (15A) and 54 (5A) are OK. If OK, REPAIR the circuit in question. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short [1][2]Diagrams By Number.

H11 CHECK THE FRONT CAMERA WASHER RELAY CONTROL CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Windshield Wiper Motor C125.

- Measure the resistance between the front camera washer relay socket pin 3, circuit CRW34 (BU/BN) and the windshield wiper motor C125-12, circuit CRW34 (BU/BN), harness side.






Is the resistance less than 3 ohms?

Yes
INSTALL a new windshield wiper motor. REFER to Wiper Motor . TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.

H12 CHECK THE WASHER PUMP SUPPLY CIRCUIT FROM THE WIPER MOTOR FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: Windshield Wiper Motor C125.

- Ignition ON.

Does the washer pump continue to operate?

Yes
REPAIR circuit CRW14 (GY) for a short to voltage. TEST the system for normal operation.
No
INSTALL a new windshield wiper motor. REFER to Wiper Motor .

H13 CHECK THE FRONT CAMERA WASHER RELAY OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: Front Camera Washer Relay.

- Ignition ON.

Does the washer pump continue to operate?

Yes
REPAIR circuit CRW24 (BU/WH) for a short to voltage. TEST the system for normal operation.
No
GO to H14.

H14 CHECK THE FRONT CAMERA WASHER RELAY (ALWAYS ON)

- Ignition OFF.

- Carry out the front camera washer relay component test.


Did the front camera washer relay pass the component test?

Yes
GO to H15.
No
INSTALL a new front camera washer relay. TEST the system for normal operation.

H15 CHECK THE FRONT CAMERA WASHER RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

- Disconnect: Windshield Wiper Motor C125.

- Measure the resistance between the windshield wiper motor C125-12, circuit CRW34 (BU/BN), harness side.






Is the resistance greater than 10,000 ohms?

Yes
REPAIR the circuit. TEST the system for normal operation.
No
INSTALL a new windshield wiper motor. REFER to Wiper Motor .

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