WARNING: This page is about a different car, the 2004 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Module Power, Ground, MIL and Serial Data
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Fig 2: Engine Data Sensors - 5-volt Reference
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Fig 3: Engine Data Sensors - Low Reference
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Fig 4: Engine Data Sensors - Pressure, Temperature, and MAF
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Fig 5: Engine Data Sensors - Oxygen Sensors
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Fig 6: Engine Data Sensors - Throttle Actuator Controls
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Fig 7: Ignition Controls - Bank 1 Ignition Coils
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Fig 8: Ignition Controls - Bank 2 Ignition Coils
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Fig 9: Ignition Controls - CMP Sensors and Solenoids
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Fig 10: Ignition Controls - CKP and Knock Sensors
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Fig 11: Fuel Controls - Fuel Injectors and Fuel Pump and Sender Assembly
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Fig 12: Fuel Controls - EVAP Controls and IMRC Solenoid