Pinpoint Test I: The Rear Window Wiper Stays On Continuously
Wipers and Washers
Pinpoint Test I: The Rear Window Wiper Stays On Continuously
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information Electrical Diagrams.
Normal Operation
The wiper/washer switch is mounted to the Steering Column Control Module (SCCM). The SCCM (Steering Column Control Module) sends the wiper mode request to the windshield wiper motor through the LIN (Local Interconnect Network). When the request is received, the windshield wiper motor supplies a momentary ground to the rear window wiper motor. The position of the wiper/washer switch determines the frequency of this ground. When the wiper/washer switch is in the INT 1 position, the windshield wiper motor provides a momentary ground approximately once every 10 to 12 seconds. In the INT 2 position, the momentary ground is provided approximately once every 3 to 5 seconds. When the ground is present, it activates an integral relay within the rear window wiper motor which activates the motor. The rear window wiper motor is self parking.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Wiper/washer switch
- Rear window wiper motor
- Windshield wiper motor
- SCCM (Steering Column Control Module)
PINPOINT TEST I : THE REAR WINDOW WIPER STAYS ON CONTINUOUSLY
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.
I1 CHECK THE WIPER/WASHER SWITCH (R_WIPE_OFF_SW) PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger- SCCM (Steering Column Control Module).
- Make sure the wiper/washer switch is in the OFF position.
- Verify the status of the SCCM (Steering Column Control Module) R_WIPE_OFF_SW PID is displayed as ON.
Is the PID status ON (indicating the wiper/washer switch is in the OFF position)?
Yes
GO to I2.
No
INSTALL a new wiper/washer switch. REFER to Wiper/Washer 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.
I2 CHECK THE REAR WINDOW WIPER OPERATION WITH THE WINDSHIELD WIPER MOTOR DISCONNECTED
- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Ignition ON.
- Verify the rear window wiper operation.
Is the rear window wiper still operating?
Yes
GO to I3.
No
GO to I4.
I3 CHECK THE REAR WINDOW WIPER COMMAND CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C4218.
- Measure the resistance between the windshield wiper motor C125-11, circuit CRW02 (GY/BU), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to I5.
No
REPAIR the circuit. TEST the system for normal operation.
I4 CHECK FOR CORRECT WINDSHIELD WIPER MOTOR OPERATION
- Ignition OFF.
- Check the windshield wiper motor connector C125 for the following conditions:
- corrosion
- pushed-out pins
- Connect the windshield wiper motor connector C125 and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield . 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. TEST the system for normal operation.
I5 CHECK FOR CORRECT REAR WINDOW WIPER MOTOR OPERATION
- Ignition OFF.
- Check the rear window wiper motor connector C4218 for the following conditions:
- corrosion
- pushed-out pins
- Connect the rear window wiper motor connector C4218 and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new rear window wiper motor. REFER to 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. TEST the system for normal operation.