The rear wiper motor is supplied battery positive voltage and ground. The liftgate control module controls rear wiper motor operation through the rear wiper motor speed signal circuit. The rear wiper motor speed signal circuit is supplied a battery positive reference voltage by the rear wiper motor module and is pulse width modulated to ground by the liftgate control module. The duty cycle of the pulse width modulation (PWM) determines the rear wiper motor operating mode.

The battery voltage must be between 9-16 volts.

The rear wiper motor speed signal circuit is open or shorted to ground.

The rear wiper/washer system will be disabled for as long as the DTC is current.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Rear Wiper/Washer System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the rear window wiper motor.
2. Test for less than 1.0 ohm between the ground circuit terminal A and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal C and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Connect the harness connector at the rear window wiper motor.
5. Disconnect the X2 harness connector at the LGM.
6. Ignition ON, test for 10.0-14.0 volts between the signal circuit terminal 3 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear window wiper motor.

7. If all circuits test normal, replace the LGM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.