Windshield Wiper Washer System Malfunction
Windshield Wiper Washer System Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
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
Wiper/Washer Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Wiper/Washer System Description and Operation (Wiper/Washer System Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) 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 (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
1. Ignition OFF, disconnect the WSW relay.
2. Ignition ON, verify that a test lamp does not illuminate between the washer pump control circuit terminal 87 and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage.
3. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
• 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.
4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
5. Disconnect the harness connector at the washer pump.
6. Test for less than 1.0 ohm between the washer pump ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the washer pump.
8. Connect a 15A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the washer pump is activated.
• 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.
9. Connect a test lamp between the B+ circuit terminal 85 and the relay control circuit terminal 86.
10. Press and release the windshield washer switch. The test lamp should turn ON and OFF when changing between the commanded states.
• 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.
11. If all circuits test normal, test or replace the WSW relay.
Component Testing
1. Ignition OFF, disconnect the relay.
2. Test for 60-200 ohms between terminals 85 and 86.
• If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If not the specified value, replace the relay.
4. Test for less than 2 ohms between terminals 30 and 87A.
• If greater than the specified range, replace the relay.
5. Install a 10A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
• If greater than the specified range, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Windshield Washer Pump Replacement (Windshield Washer Pump Replacement)
* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Windshield Wiper Motor Cover Replacement (Windshield Wiper Motor Cover Replacement)