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 |
|---|---|---|---|---|
Washer Pump Relay Control | 2 | 1 | -- | -- |
Washer Pump Control | 1 | 1 | 2 | -- |
Washer Pump Ground | -- | 1 | -- | -- |
1. Windshield washer pump inoperative 2. Windshield washer pump always on | ||||
Circuit/System Description
The windshield washer pump is controlled through the windshield wash relay. The windshield wash relay coil and switch is supplied battery positive voltage, and during WASH mode the wiper motor module grounds the washer relay control circuit energizing the relay. When the relay is energized battery positive voltage to the switch side of the relay is supplied to the washer pump control circuit.
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
Ignition ON, press and release the windshield washer switch. The washer pump and wiper motor should operate for as long as the switch is pressed, and the wiper motor will continue to operate several cycles after the switch is released.
| ⇒ | If the wiper motor is inoperative during wash mode, refer to Windshield Wiper System Malfunction . |
| ⇒ | If the washer pump is inoperative during wash mode, refer to Washer Pump Control Circuit Test. |
Circuit/System Testing
Washer Pump Control Circuit Test
- Ignition OFF, disconnect the WSW relay.
- Ignition ON, verify that a test lamp does not illuminate between the washer pump control circuit terminal 87 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
- Disconnect the harness connector at the washer pump.
- Test for less than 1.0 ohm between the washer pump ground circuit terminal B and ground.
- Connect the harness connector at the washer pump.
- Connect a 15A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the washer pump is activated.
- Connect a test lamp between the B+ circuit terminal 85 and the relay control circuit terminal 86.
- Press and release the windshield washer switch. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, test or replace the WSW relay.
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the washer pump control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the WSW relay. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the washer pump does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the washer pump. |
| ⇒ | If the test lamp is always ON, test the relay control circuit for a short to ground. If the circuit tests normal, replace the wiper motor cover. |
| ⇒ | If the test lamp is always OFF, test the relay control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the wiper motor cover. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
