Diagnostic Instructions
| • | 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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Rear Window Wiper Motor B+ | 2 | 1 | 1 | -- |
Windshield Washer Fluid Pump Control | 1 | 1 | 2 | -- |
Windshield Washer Relay Control | 2 | 1 | B3873 00 | -- |
Windshield Washer Switch Low Reference | -- | 1 | 1 | -- |
Windshield Washer Fluid Pump Ground | -- | 1 | -- | -- |
1. Washer Inoperative 2. Washers Always ON | ||||
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
Connector End View Reference
Description and Operation
Wiper/Washer System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References 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 |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the rear window wiper/washer module.
- Ignition ON, rear wiper/washer switch in the WASHER position, test for ignition voltage between the signal circuit terminal 1 and ground.
- Ignition OFF, connect the harness connector at the rear window wiper/washer module. Disconnect the harness connector at the rear washer motor.
- Test for less than 10 ohms between the ground circuit terminal 2 and ground.
- Ignition ON, rear wiper/washer switch in the WASHER position, verify a test lamp illuminates between the control circuit terminal 1 and ground.
- If all circuits test normal, test or replace the rear washer motor.
| ⇒ | If not than the specified value, test or replace the multifunction switch. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | 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. |
Component Testing
Wiper/Washer Switch
- With the WASH switch in the open position, test for infinite resistance between the low reference terminal 11 and the signal terminal 16.
- 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 not the specified value, replace the multifunction switch. |
| ⇒ | If greater than the specified range, replace the multifunction switch. |
Washer Pump
- Ignition OFF, disconnect the harness connector at the washer pump.
- 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.
- Verify the washer pump is activated.
| ⇒ | If the washer pump does not activate , replace the washer pump. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
