WARNING: This page is about a different car, the 2007 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground and Serial Data Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Wheel Speed Sensors Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Indicator, Traction Control, and Brake Pedal Position Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 4: Stability Control System and Brake Fluid Pressure Sensor Schematic