Headlamp Washer Malfunction
Headlamp Washer 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
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 Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Headlamp Washer System Description and Operation Headlamp Washer System
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 Control Module References for scan tool information
Circuit/System Verification
1. Verify headlamps are turned on.
2. Ignition ON, observe the scan tool Headlamp Washer Relay Command parameter while pressing and releasing the windshield washer switch. The reading should change between On and Off.
• If not the specified value, refer to Multifunction Switch Circuit Test.
3. If the switch input to the BCM functions normal refer to Headlamp Washer Pump Circuit Test.
Circuit/System Testing
Windshield Washer Switch
1. Ignition OFF, disconnect the X1, harness connector at the multifunction switch.
2. Test for less than 1.0 ohm between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance, if the circuit tests normal , replace the BCM.
3. Ignition ON, verify the scan tool Headlamp Wash parameter is Off.
• If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the BCM.
4. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the ground. 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 multifunction switch.
Headlamp Washer Pump Circuit Test
1. Ignition OFF, disconnect the HEADLAMP WASH relay.
2. Test for less than 10.0 ohm between the ground circuit terminal 85 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. 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.
4. Disconnect the harness connector at the headlamp washer fluid pump.
5. Test for less than 5.0 ohm between the headlamp washer fluid pump ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
6. Connect the harness connector at the headlamp washer fluid pump.
7. Connect a 20 A fused jumper wire between the B+ circuit terminal 30 and the washer pump control circuit terminal 87. Verify the headlamp washer fluid pump is activated.
• If the headlamp washer fluid pump does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the headlamp washer fluid pump.
8. Connect a test lamp between the B+ circuit terminal 86 and the relay control circuit terminal 85.
Note: Turn the headlamps on prior to performing the test in step 9. During the test, the test lamp may not turn ON for up to five cycles of the headlamp washer fluid pump.
9. 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.
10. If all circuits test normal, test or replace the HEADLAMP WASH relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Headlamp Washer Pump Replacement (V Series CE4) Service and Repair
* Turn Signal Multifunction Switch Replacement Turn Signal Multifunction Switch Replacement
* Underhood Electrical Center or Junction Block Replacement Underhood Electrical Center or Junction Block Replacement
* Control Module References Control Module References for BCM replacement, programming, and setup