Troubleshooting Hints - Interior Lights Dimming

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Check that the park lamps are operating properly.If not, refer to Exterior Lights. Testing and Inspection
2. If only the VF display for the instrument cluster is inoperative, check the underhood junction block SBM LCM Fuse by visual inspection.If open, check for a short to ground in CKT 39 (PNK).
3. If only the VF display for the radio is inoperative, check the rear junction block RDO/PH Fuse by visual inspection.If open, check for a short to ground in CKT 43 (YEL).
4. If only the VF display for the heater and A/C programmer is inoperative, check the I/P Junction block HVAC Fuse by visual inspection.If open, check for a short to ground in CKT 341 (BRN). Refer to the schematics located in HVAC - Air Delivery and Temperature Controls: Automatic. Electrical Diagrams
5. If only the VF display for the head-up display (HUD) is inoperative, check the I/P Junction block Hut) Fuse by visual inspection.If open, check for a short to ground in CKT 841 (BRN).
6. Check that grounds G201, G202, and G400 are clean and tight.
7. If only one lamp does not operate or dim, check bulb, socket and related wiring (see schematic).
8. Before component replacement, check for poor connections at related component and in-line harness connector terminal connections.
9. Check for broken (or partially broken) wire inside of the insulation which could cause a 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).
10. Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.