Troubleshooting Hints - Interior Lights Dimming

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS:
1. Check the EXT LP Fuse by turning the Headlamp Switch to "PARK" and observing that the Park Lamps come on.
2. If none of the Instrument Panel lamps come on and the EXT LP Fuse is OK, check the INST LPS Fuse.
3. If only one Instrument Panel lamp does not come on, check bulb, connections, and related wiring for an open.
^ 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 (under 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.