WARNING: This page is about a different car, the 2008 Cadillac XLR. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: ECM Power, Ground, MIL, and Serial Data
Courtesy of GENERAL MOTORS CORP.
Fig 2: 5-Volt Reference Bussing
Courtesy of GENERAL MOTORS CORP.
Fig 3: Low Reference Bussing
Courtesy of GENERAL MOTORS CORP.
Fig 4: MAF/IAT, ECT, MAP Sensors, and Stop Lamp Switch Signal
Courtesy of GENERAL MOTORS CORP.
Fig 5: Heated Oxygen Sensors
Courtesy of GENERAL MOTORS CORP.
Fig 6: Electronic Throttle Controls
Courtesy of GENERAL MOTORS CORP.
Fig 7: SCIAP, IAT 2, BARO Sensors, Super Charger Vacuum Bypass Valve, and Charge Air Cooler (CAC) Coolant Pump