Troubleshooting Hints - Interior Lights Dimming

TRY FOLLOWING CHECKS BEFORE DOING SYSTEM CHECK.
1. If only one lamp does not light, check bulb, bulb connections and wiring to the bulb.
2. Check I/P Fuse block Interior Lamps Fuse by visual inspection.
3. Check Up Fuse Block HVAC CONT Fuse by visual inspection. (Buick Only)
4. Before component replacement, check for poor connections at related component and in-line harness connector terminal connections.