WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Module Power, Ground, Serial Data and Front Sensors Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Steering Wheel and I/P Module Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Side Impact Modules and Sensors (ASF) Schematic