WARNING: This page is about a different car, the 2004 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, Serial Data and DIC
Courtesy of GENERAL MOTORS CORP.
Fig 2: Vehicle Stability Enhancement System (JL4)
Courtesy of GENERAL MOTORS CORP.
Fig 3: BPP Sensor, Switches and Indicators - 2.6L/3.2L/3.6L (LY9/LA3/LY7)
Courtesy of GENERAL MOTORS CORP.
Fig 4: BPP Sensor, Switches and Indicators - 5.7L (LS6)
Courtesy of GENERAL MOTORS CORP.
Fig 5: Wheel Speed Sensors and Variable Effort Steering Actuator