Headlamp Washer Malfunction
Headlamp Washer Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
Battery positive voltage is supplied to the coil and switch sides of the headlamp washer relay. The body control module (BCM) energizes the relay by grounding the relay coil through the relay control circuit. When the relay is energized, the relay switch is closed and battery positive voltage 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
Headlamp Washer System Description and Operation (Headlamp Washer System Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Headlamp Wash parameter while pressing and releasing the headlamp washer switch. The reading should change between On and Off.
• If not the specified value, refer to Headlamp Washer Switch Circuit Test.
2. If the switch input to the BCM functions normal refer to Headlamp Washer Pump Circuit Test.
Circuit/System Testing
Headlamp Washer Switch Circuit Test
1. Ignition OFF, disconnect the X1, X2 harness connectors at the headlamp switch.
2. Test for less than 1.0 ohm between the ground circuit terminal C X1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Headlamp Wash parameter is Off.
• If not the specified value, test the signal circuit terminal H X2 for a short to ground. If the circuit tests normal, replace the BCM.
4. Install a 3A fused jumper wire between the signal circuit terminal H X2 and the ground circuit terminal C X1. Verify the scan tool Headlamp Wash parameter is On.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the headlamp switch.
Headlamp Washer Pump Circuit Test
1. Ignition OFF, disconnect the HEADLAMP WPR relay.
2. Ignition ON, verify that a test lamp does not illuminate between the washer pump control circuit terminal 30 and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage.
3. Disconnect the harness connector at the headlamp washer pump.
4. Test for less than 1.0 ohm between the headlamp washer pump ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
5. Connect the harness connector at the headlamp washer pump.
6. Connect a 20A fused jumper wire between the B+ circuit terminal 87 and the washer pump control circuit terminal 30. Verify the headlamp washer pump is activated.
• If the headlamp washer pump does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the headlamp washer pump.
7. Connect a test lamp between the B+ circuit terminal 85 and the relay control circuit terminal 86.
8. Operate the headlamp washer switch ON and OFF. 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 BCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
9. If all circuits test normal, test or replace the HEADLAMP WPR relay.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Headlamp Washer Pump Replacement (Service and Repair)
* Headlamp Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, programming, and setup