Troubleshooting Hints - Interior Lights

1. Check the INT LAMP Fuse. If the INT LAMP Fuse is open, check for a short to ground in CKT 240.
2. Check that grounds G119, G200, G301 and G402 are clean and tight.
3. Check BCM for DTC codes (refer to Body Control Module (BCM) for Diagnostic procedures). 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 (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.