WARNING: This page is about a different car, the 2006 GMC Yukon XL, 2006 Chevrolet Suburban, and 2006 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Modular Power, Ground, Serial Data, and MIL
Courtesy of GENERAL MOTORS CORP.
Fig 2: Engine Data Sensors - 5-Volt and Low Reference
Courtesy of GENERAL MOTORS CORP.
Fig 3: Engine Data Sensors - Pressure, Temperature, MAF, and VSS
Courtesy of GENERAL MOTORS CORP.
Fig 4: Engine Data Sensors - Oxygen Sensors
Courtesy of GENERAL MOTORS CORP.
Fig 5: Engine Data Sensors - Electronic Throttle Control
Courtesy of GENERAL MOTORS CORP.
Fig 6: Ignition Controls - Ignition System Coils 1, 3, 5, and 7
Courtesy of GENERAL MOTORS CORP.
Fig 7: Ignition Controls - Ignition System Coils 2, 4, 6, and 8
Courtesy of GENERAL MOTORS CORP.
Fig 8: Ignition Controls - Sensors
Courtesy of GENERAL MOTORS CORP.
Fig 9: Fuel Controls - Fuel Pump Controls
Courtesy of GENERAL MOTORS CORP.
Fig 10: Fuel Controls - Fuel Injectors
Courtesy of GENERAL MOTORS CORP.
Fig 11: Fuel Controls - EVAP Controls
Courtesy of GENERAL MOTORS CORP.
Fig 12: Transmission and Controlled/Monitored Subsystem References