WARNING: This page is about a different car, the 2007 Saturn Ion Red Line, 2007 Saturn Ion 3, and 2007 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: BCM Power, Ground, and References to Brakes, Lights, Dimming, DLC, HVAC, Shift Lock, and Theft Deterrent