• | 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 |
---|---|---|---|---|
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 |
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.
Wiper/Washer System Description and Operation
Control Module References for scan tool information
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. |
⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.