Troubleshooting Hints - Interior Lights

1. Check Fuse 28. If Fuse 28 is open, check for a short to ground in CKT 240.
2. Check Fuse 39. If Fuse 39 is open, check for a short to ground in CKT 39.
3. Check HD LPS Maxi Circuit Breaker.
4. Check Fuse 19. If Fuse 19 is open, check for a short to ground in CKT 1140.
5. Check Fuse 1. If Fuse 1 is open, check for a short to ground in CKT 1240.
6. If a single lamp is inoperative then check the bulb(s)
7. Check that grounds G119, G203, G205, G301, G302 are clean and tight.
^ 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.