July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Body Control System Schematics
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, Serial Data, and Subsystem References Schematic (1 Of 4)