Troubleshooting Hints

WARNING: Halogen bulbs contain a gas under pressure. Handling a bulb improperly could cause it to shatter into flying glass fragments. To help avoid personal injury:
- Turn OFF the Headlamp and instrument panel lamp dimmer switch and allow the bulb to cool before changing bulbs. Leave the Headlamp and instrument panel lamp dimmer switch OFF until the bulb change is complete.
- Always wear eye protection when changing a halogen bulb.
- Handle the bulb only by its base. Avoid touching the glass.
- Do not drop or scratch the bulb. Keep moisture away.
- Place the used bulb in the new bulb's carton and dispose of it properly. Keep halogen bulbs out of reach of children.

1. Check the PARK I/P Fuse for an open. if open repair a short to ground in circuit 1340.
2. Check the HEADLAMP circuit breaker, if open repair a short to ground in circuit 2340.
3. Check the HVAC/DRL Fuse for an open, if open repair a short to ground in circuit 241.
4. Check the Daytime Running Lamp (DRL) Fuse for an open, if open repair a short to ground in circuit 1839.
5. Check suspect Headlamp bulb or park/turn bulb for damage or an open filament.
6. If a Headlamp bulb has been found damaged and an unusually high amount of moisture is noticeable in the Headlamp. Check the vent tube and drain tube for restriction. Small amounts of moisture are normally found in the Headlamp. However, excessive moisture can damage the lamps.
7. Check the LH and RH Headlamp and park/turn lamps connectors to be sure the connector seals are not damaged or missing.
8. If one Headlamp or park/turn lamp does not work, check the bulb, connections and wires to that component.
9. If the BRAKE indicator is lit with the ignition switch in RUN and the park brake released, refer to Brake Warning System, for diagnosis. Testing and Inspection
10. If the night mode of the Daytime Running Lamps (DRL) control module is activated in bright light, check that the DRL ambient light sensor is not obstructed (by dirt or lint, for example).
11. If the fog lamps do not operate, or fail to operate correctly, refer to Fog Lamps. Testing and Inspection
- Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove GOOD in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (tinder load).
- Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems, refer to General Troubleshooting Procedures. Diagnostic Aids
- Refer to System Diagnosis.