July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Body Control System Wiring Schematics
WARNING: This page is about a different car, the 2006 Pontiac Torrent and 2006 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, and Communication
Courtesy of GENERAL MOTORS CORP.
Fig 2: Lighting and Wiper/Washer System References