WARNING: This page is about a different car, the 2009 GMC Canyon and 2009 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, and Serial Data
Courtesy of GENERAL MOTORS CORP.
Fig 2: Impact Sensors and Modules
Courtesy of GENERAL MOTORS CORP.
Fig 3: Passenger Presence
Courtesy of GENERAL MOTORS CORP.
Fig 4: Seat Position Sensors and Seat Belt Pretensioners