WARNING: This page is about a different car, the 2005 Saturn Ion Red Line. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, MIL, and Serial Data Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 2: Engine Data Sensors - 5-Volt and Low Reference Busing Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 3: Engine Data Sensors Schematics - Pressure and Temperature
Courtesy of GENERAL MOTORS CORP.
Fig 4: Engine Data Sensors - MAF/IAT, CKP, KS and Stop Lamp Switch Schematics - Lower
Courtesy of GENERAL MOTORS CORP.
Fig 5: Engine Data Sensors Schematics - HO2S
Courtesy of GENERAL MOTORS CORP.
Fig 6: Engine Data Sensors Schematics - APP and TAC
Courtesy of GENERAL MOTORS CORP.
Fig 7: Ignition Controls Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 8: Fuel Controls Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 9: EVAP Controls, After Cooler Pump, and Supercharger By-Pass Valve Solenoid Schematics