Troubleshooting Hints - Interior Lights

1. CHECK the condition of the CTSY (FUSE 3), GAUGES (FUSE 4), AUX PWR (FUSE 7), PK LPS (FUSE 9), CIG LTR (FUSE 13). If any Fuse(s) is open, then LOCATE and REPAIR source of overload and REPLACE fuse.
2. CHECK that Grounds G105, G110, G107, G200, and G400 are clean and tight.
3. CHECK for open filaments in inoperative Lamps. If I/P Compartment Lamp remains ON with the Switch OFF, then REPLACE the I/P Compartment Lamp Assembly.
4. If any Reading Lamp stays ON, REPLACE Reading Lamp assembly.
5. If any Vanity Lamp stays ON REPLACE Vanity Lamp Assembly.
^ 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 (See Diagnostic Aids for General Troubleshooting Procedures). Diagnostic Aids