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 Fuel Pump and Level Sensor Assembly - Primary
Description and Operation
Wiper/Washer System Description and Operation 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 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 Windshield Washer Switch Test.
3. If the switch input to the BCM functions normal, refer to Headlamp Washer Pump Circuit Test.
Circuit/System Testing
Windshield Washer Switch Test
1. Ignition OFF, disconnect the harness connector at the S82 windshield wiper/washer switch.
2. Test for less than 5 ohms between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the low reference 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 5 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 5 and 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 S82 windshield wiper/washer switch.
Headlamp Washer Pump Circuit Test
1. Ignition OFF, disconnect the KR2 headlamp washer pump relay.
2. Test for less than 5 ohms between the ground circuit terminal 86 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 G16 headlamp washer pump.
5. Test for less than 5 ohms between the headlamp washer pump ground circuit terminal A and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
6. Connect the harness connector at the G16 headlamp washer 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 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 G16 headlamp washer pump.
8. Connect a test lamp between the B+ circuit terminal 85 and the relay ground circuit terminal 86.
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 KR2 headlamp washer pump relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Headlamp Washer Pump Replacement Service and Repair
* Turn Signal Multifunction Switch Replacement Turn Signal Multifunction Switch Replacement
* Control Module References Control Module References for BCM replacement, programming and setup