Pinpoint Test H: The Rear Window Wiper Is Inoperative In One Or Both Speeds
Wipers and Washers
Pinpoint Test H: The Rear Window Wiper Is Inoperative In One Or Both Speeds
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:
- Fuse
- Wiring, terminals or connectors
- Wiper/washer switch
- Rear window wiper motor
- Windshield wiper motor
- SCCM (Steering Column Control Module)
PINPOINT TEST H : THE REAR WINDOW WIPER IS INOPERATIVE IN ONE OR BOTH SPEEDS
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 WIPER/WASHER SWITCH 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) R_WIPE_DEL1 and R_WIPE_DEL2 PIDs, place the wiper/washer switch into the rear window wiper INT 1 position.
Do the PIDs correspond to the wiper/washer switch positions?
Yes
GO to H2.
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.
H2 CHECK THE REAR WINDOW WIPER MOTOR VOLTAGE CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C4218.
- Ignition ON.
- Measure the voltage between the rear window wiper motor C4218-1, circuit SBB64 (VT/RD), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to H3.
No
VERIFY Battery Junction Box (BJB) fuse 64 (20A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short Electrical Diagrams. TEST the system for normal operation.
H3 CHECK THE REAR WINDOW WIPER MOTOR GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between the rear window wiper motor C4218-3, circuit GD149 (BK/GY), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to H4.
No
REPAIR the circuit. TEST the system for normal operation.
H4 CHECK THE REAR WINDOW WIPER MOTOR INPUT
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 the 12-volt incandescent test light between the rear window wiper motor C4218-1, circuit SBB64 (VT/RD), harness side and the rear window wiper motor C4218-2, circuit CRW02 (GY/BU), harness side.
- Place the wiper/washer switch into the rear window wiper INT 2 position and observe the test light.
Does the test light illuminate briefly approximately once every 3 to 5 seconds?
Yes
GO to H6.
No
GO to H5.
H5 CHECK THE REAR WINDOW WIPER MOTOR INPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between the windshield wiper motor C125-11, circuit CRW02 (GY/BU), harness side and the rear window wiper motor C4218-2, circuit CRW02 (GY/BU), harness side.
Is the resistance less than 5 ohms?
Yes
GO to H7.
No
REPAIR the circuit. TEST the system for normal operation.
H6 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.
H7 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.