WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, Roll Over Sensor, and PPS Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Modules and Sensors Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Pretensioners and Front End Sensor Schematic