WARNING: This page is about a different car, the 2007 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) (J56 for LS2)
Courtesy of GENERAL MOTORS CORP.
Fig 3: BPP Sensor, Switches, and Indicators - 2.8L/3.6L (LP1/LY7)
Courtesy of GENERAL MOTORS CORP.
Fig 4: BPP Sensor, Switches, and Indicators - 6.0L (LS2)
Courtesy of GENERAL MOTORS CORP.
Fig 5: Wheel Speed Sensors and Variable Effort Steering Actuator