Troubleshooting Hints - Interior Lights

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Check for open RH CTSY Fuse. If open, check for short in CKT 740.
2. Make sure grounds G106, G201, G202 are clean and tight.
3. Check to see if Central Control Module (CCM) Diagnostic Trouble Codes (DTCs) 24 or 25 are set. If set, refer to Central Control Module for diagnosis. Central Control Module
^ 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. System Diagnosis - Interior Lights