WARNING: This page is about a different car, the 2004 GMC Yukon XL, 2004 Chevrolet Suburban, and 2004 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Module Power, Ground, Serial Data And MIL Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Engine Data Sensors - Pressure, Temperature And VSS Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Engine Data Sensors - HO2S Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 4: Engine Data Sensors - Electronic Throttle Controls Schematic - 1 Of 2
Courtesy of GENERAL MOTORS CORP.
Fig 5: Engine Data Sensors - Electronic Throttle Controls Schematic - 2 Of 2
Courtesy of GENERAL MOTORS CORP.
Fig 6: Ignition Controls - Ignition System Coils 1, 3, 5 And 7 Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 7: Ignition Controls - Ignition System Coils 2, 4, 6 And 8 Schematic