Troubleshooting Hints - Interior Lights Dimming

TRY FOLLOWING CHECKS BEFORE DOING SYSTEM CHECK
1. If only one lamp does not light, check bulb connections and wiring to bulb for an open (see schematic).
2. Check I/P Fuse block Fuses 4A, 6C, 8D and 9C by visual inspection.
3. Check that grounds G105 (Oldsmobile and Buick),G201 (Oldsmobile and Buick) and G202 are clean and tight.
4. Before component replacement, check for poor connections at related component and in-line harness connector terminal connections. Refer to General Troubleshooting Procedure. Diagnostic Aids
^ Refer to System Check for a guide to normal operation.