WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pontiac Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Power, Ground, Class 2 Serial Data and Inflatable Restraint Sensors Schematic - Buick
Courtesy of GENERAL MOTORS CORP.
Fig 3: Seat Belt Pretensioners and Inflatable Restraint Modules Schematic - Buick