Troubleshooting Hints - Interior Lights Dimming

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Always suspect an open lamp filament before proceeding with diagnostics.
2. Check that grounds G110, G200 and G400 are clean and tight.
3. Check RADIO Fuse 13 and I/P DIMMER Fuse 16.
- 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 he 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 Troubleshooting Procedures). Diagnostic Aids
- Refer to System Diagnosis.
- If the Daytime Running Lamps (DRL) System is suspected of causing a failure, refer to the circuit operation and schematics in Daytime Running Lights for better understanding of the DRL System. Daytime Running Lamp