WARNING: This page is about a different car, the 2004 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: PWR, GND, Stop Lamp Switch, Solenoid Valves, and Pump Motor Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Wheel Speed Sensors Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Vehicle Stability Enhancement System (w/JL4) Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 4: Traction Control (w/NW9) Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 5: Indicators and Traction Control Switch Schematic