Pinpoint Test F: The CONTINUOUS Or INTERMITTENT Wiper Speeds Do Not Operate Correctly - Rear Window

Wipers and Washers

Pinpoint Test F: The CONTINUOUS or INTERMITTENT Wiper Speeds Do Not Operate Correctly - Rear Window

Refer to Wiring Diagram Set 81, Front Wipers and Washers for schematic and connector information Electrical Diagrams.

Normal Operation

The Body Control Module (BCM) supplies a signal voltage(s) to the wiper/washer switch for CONTINUOUS and INTERMITTENT wiper functions. Both functions share a dedicated signal (sense) line. The wiper/washer switch physically grounds the signal voltage(s) when a function is selected. The BCM (Body Control Module) reacts to the grounded signal voltage(s) and its integral electronics make a decision on which wiper system function to carry out (depending on the windshield wiper setting).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Wiper/washer switch

- Rear window wiper motor

- BCM (Body Control Module)

PINPOINT TEST F : THE CONTINUOUS OR INTERMITTENT WIPER SPEEDS DO NOT OPERATE CORRECTLY - REAR WINDOW

F1 CHECK FOR BCM (Body Control Module) DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self-Test- BCM (Body Control Module).

Are any BCM (Body Control Module) DTCs present?

Yes
REFER to the Body Control Module (BCM) DTC Chart for further diagnosis Wiper and Washer Systems.

No
GO to F2.

F2 CHECK OPERATION OF THE WINDSHIELD WIPERS

- Operate the windshield wipers in LOW, HIGH and in each INTERMITTENT mode.

Do the windshield wipers operate correctly?

Yes
GO to F3.

No
IDENTIFY the windshield wiper system symptom and GO to Symptom Chart for further diagnosis Symptom Related Diagnostic Procedures.

F3 CHECK THE BCM (Body Control Module) PID REAR WIPER INPUT SWITCH STATUS (R_WP-SW)

- Enter the following diagnostic mode on the scan tool: DataLogger- BCM (Body Control Module).

- Monitor the BCM (Body Control Module) PID R_WP-SW while operating the wiper/washer switch in the rear wiper mode.

Does the status of the PID match the wiper/washer switch setting?

Yes
GO to F5.

No
GO to F4.

F4 CHECK THE WIPER/WASHER SWITCH

- Ignition OFF.

- Disconnect: Wiper/Washer Switch C2081.

- Carry out the wiper/washer switch component test.

Does the wiper/washer switch pass the component test?

Yes
GO to F8.

No
INSTALL a new wiper/washer switch. TEST the system for normal operation.

F5 CHECK THE REAR WINDOW WIPER MOTOR GROUND FOR HIGH RESISTANCE

- Ignition OFF.

- Disconnect: Rear Window Wiper Motor C4218.

- Measure the resistance between rear window wiper motor C4218-3, circuit GD143 (BK/VT), harness side and ground.





Is the resistance less than 5 ohms?

Yes
GO to F6.

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

F6 CHECK FOR VOLTAGE TO THE REAR WINDOW WIPER MOTOR USING THE BCM (Body Control Module) PID REAR WIPER RELAY (WPR_RLY_REAR)

- Ignition ON.

- Command the BCM (Body Control Module) PID WPR_RLY_REAR on.

- Measure the voltage between rear window wiper motor C4218-1, circuit CRW02 (GY/BU), harness side and ground and between rear window wiper motor C4218-2, circuit CRW05 (BU), harness side and ground.





Are the voltages greater than 10 volts?

Yes
GO to F7.

No
GO to F8.

F7 CHECK FOR CORRECT WIPER MOTOR OPERATION

- Ignition OFF.

- Inspect rear window wiper motor C4218 for the following conditions:
- corrosion

- damaged or pushed out pins


- Connect the rear window wiper motor C4218 and make sure it seats correctly.

- Connect: Wiper/Washer Switch C2081.

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

Is the concern still present?

Yes
INSTALL a new rear window wiper motor. REFER to Wiper Motor - Rear Window Wiper Motor - Rear Window. TEST the system for normal operation.

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

F8 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

- Ignition OFF.

- Inspect the BCM (Body Control Module) connectors for the following conditions:
- corrosion

- damaged or pushed out pins


- Connect the BCM (Body Control Module) connectors and make sure they seat correctly.

- Connect: Wiper/Washer Switch C2081.

- Connect: Rear Window Wiper C4218.

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

Is the concern still present?

Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

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