Rear Wiper System Malfunction
Rear Wiper System Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The rear wiper is controlled based on an input from the rear wiper/washer switch. When closed, the wiper ON switch provides a voltage signal to the rear window wiper motor indicating rear wiper operation is requested. The rear wiper motor receives B+ voltage from the I/P fuse block and accessory voltage from the body control module (BCM).
Reference Information
Schematic Reference
Wiper/Washer Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Rear Wiper/Washer System Description and Operation Rear Wiper/Washer System
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
Command the rear wiper ON using the rear wiper switch. The rear wiper should activate.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the multifunction switch - I/P.
2. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 6 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Power Mode Mismatch Power Mode Mismatch.
3. Ignition OFF, connect the harness connector at the multifunction switch - I/P. Disconnect the harness connector at the rear window wiper motor.
4. Test for less than 20 ohms between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
5. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
6. Verify a test lamp illuminates between the ignition circuit terminal E and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Rear wiper switch in the ON position, verify a test lamp illuminates between the signal circuit terminal D and ground.
• If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the I/P switch assembly.
8. If all circuits test normal, test or replace the rear window wiper motor.
Component Testing
I/P Switch Assembly
1. Ignition OFF, disconnect the harness connector at the multifunction switch - I/P.
2. Rear wiper switch in the OFF position, test for infinite resistance between the ignition terminal 6 and the signal terminal 5.
• If not the specified value, replace the I/P switch assembly.
3. Rear wiper switch in the ON position, test for less than 5 ohms between the ignition terminal 6 and the signal terminal 5.
• If not within the specified range, replace the I/P switch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Accessory Switch Replacement Service and Repair
* Rear Window Wiper Motor Replacement (Acadia) Rear Window Wiper Motor ReplacementRear Window Wiper Motor Replacement (Enclave) Rear Window Wiper Motor ReplacementRear Window Wiper Motor Replacement (Traverse) Rear Window Wiper Motor Replacement
* Turn Signal Multifunction Switch Replacement Turn Signal Multifunction Switch Replacement