• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Rear Window Wiper Motor B+ | 1 | 1 | -- | -- |
Rear Window Wiper Switch Ignition Voltage | 1 | 1 | 4 | -- |
Rear Window Wiper Switch Signal | 1 | 1 | 2 | -- |
Liftgate Ajar Switch Signal | 1 | 3 | 3 | -- |
Rear Window Wiper Motor Ground | -- | 1 | -- | -- |
1. Rear window wiper motor inoperative 2. Rear window wiper motor always on 3. Rear window wiper motor operates with liftgate or liftgate window open 4. Rear window wiper motor operates with ignition off |
The rear wiper is controlled based on an input from the rear wiper/washer portion of the multifunction switch. When the switch is in the ON or DELAY, a voltage signal is sent to the rear window wiper motor indicating the desired speed. Each switch position has resistor that drops the voltage to a specified value which is interpreted by the rear window wiper motor as ON or DELAY.
Rear Wiper/Washer System Description and Operation
Control Module References for scan tool information
⇒ | If not the specified values refer to Liftgate/Liftgate Window Ajar Indicator Malfunction . |
⇒ | If the rear wiper motor and the rear washer pump are inoperative , refer to the Rear Wiper Washer Switch Circuit Test. |
⇒ | If the rear washer pump operates normal and the rear wiper motor is inoperative, refer to the Rear Wiper Motor Circuit Test. |
⇒ | If the wiper motor is inoperative in the DELAY or ON modes, refer to the Rear Wiper Motor Circuit Test. |
⇒ | If the rear wiper stops out of the park position, replace the rear window wiper motor. |
⇒ | 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 . |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for an open/high resistance or short to ground. |
⇒ | If B+ is not present, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal replace the turn signal multifunction switch. |
⇒ | If not the specified value, replace the turn signal multifunction switch. |
⇒ | If not within the specified range, replace the turn signal multifunction switch. |
⇒ | If not within the specified range, replace the turn signal multifunction switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.