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 (Connector End Views By Name)
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 ohm 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 ohm 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 Rear Window Wiper Motor Replacement
* Turn Signal Multifunction Switch Replacement (Turn Signal Multifunction Switch Replacement)