System Diagnosis

Bulbs
Visually inspect the bulb. Check the resistance through the bulb.
Replace as needed.
If this component is good, go to the next item indicated on the Complaint-Condition Chart.

Headlamp Switch
Refer to Lever Combination Switch "(LCS)" for testing. Testing and Inspection
Repair/replace as needed.
If this component is good go to the next item indicated on the Complaint-Condition Chart.

I/P Dimmer
Perform the following checks at the instrument panel dimmer harness connector, with the instrument panel dimmer disconnected.
Pin A Continuity to ground
Pin B Battery voltage with park lights On
Pin C Battery voltage with park lights On
Repair/replace as needed.
If all other wiring, components, and all of the above checks are OK, replace I/P dimmer.