July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Interior Lights Dimming Schematics
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Coupe - Wiring Diagram
Courtesy of GENERAL MOTORS CORP.
Fig 2: Sedan - Wiring Diagram
Courtesy of GENERAL MOTORS CORP.
Fig 3: Radio, HVAC Control Module, Driver Information Center (DIC) Switch, and Steering Wheel Controls - Wiring Diagram