WARNING: This page is about a different car, the 2006 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: DLC, Ground, MIL and Power - Wiring Diagram
Courtesy of GENERAL MOTORS CORP.
Fig 2: 5-Volt Reference Bussing - Wiring Diagram
Courtesy of GENERAL MOTORS CORP.
Fig 3: Low Reference Bussing - Wiring Diagram
Courtesy of GENERAL MOTORS CORP.
Fig 4: Engine Data Sensors - Pressure, Temperature, IAT/MAF, VSS and Brake Travel - Wiring Diagram