Rear Wiper Washer System Malfunction
Rear Wiper Washer System Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The rear wiper washer control module controls the washer motor based on an input from the windshield washer switch, The BCM monitors the washer switch through the windshield washer switch signal circuit. When the WASH switch is closed, ground is supplied to the windshield washer switch signal circuit. When this is seen, the rear wiper washer control module will command the rear washer fluid pump on.
Reference Information
Schematic Reference
Wiper/Washer Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Wiper/Washer System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for Scan Tool Information
Circuit/System Verification
Rear wiper switch in the WIPER position. The rear wiper should turn ON.
If the rear wiper does not turn ON, refer to Rear Wiper System Malfunction (Rear Wiper System Malfunction)
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the rear window wiper/washer module.
2. Ignition ON, rear wiper/washer switch in the WASHER position, test for ignition voltage between the signal circuit terminal 1 and ground.
• If not than the specified value, test or replace the multifunction switch.
3. Ignition OFF, connect the harness connector at the rear window wiper/washer module. Disconnect the harness connector at the rear washer motor.
4. Test for less than 10 ohms between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
5. Ignition ON, rear wiper/washer switch in the WASHER position, verify a test lamp illuminates between the control circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the rear window wiper/washer module.
6. If all circuits test normal, test or replace the rear washer motor.
Component Testing
Wiper/Washer Switch
1. With the WASH switch in the open position, test for infinite resistance between the low reference terminal 11 and the signal terminal 16.
• If not the specified value, replace the multifunction switch.
2. With the WASH switch in the closed position, test for less than 2 ohms between the ground terminal 11 and the signal terminal 15.
• If greater than the specified range, replace the multifunction switch.
Washer Pump
1. Ignition OFF, disconnect the harness connector at the washer pump.
2. Install a 10A fused jumper wire between the control circuit terminal 1 and 12 volts. Install a jumper wire between the ground circuit terminal 2 and ground.
3. Verify the washer pump is activated.
• If the washer pump does not activate , replace the washer pump.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Windshield Wiper and Washer Switch Replacement (Service and Repair)
* Liftgate Wiper Motor Replacement (Liftgate Wiper Motor Replacement)
* Rear Window Washer Pump Replacement (Rear Window Washer Pump Replacement)