WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: ECM Power, Ground, DLC, and MIL
Courtesy of GENERAL MOTORS CORP.
Fig 2: Engine Data Sensors - 5-Volt Reference Bus
Courtesy of GENERAL MOTORS CORP.
Fig 3: Engine Data Sensors - Low Reference Bus
Courtesy of GENERAL MOTORS CORP.
Fig 4: Engine Data Sensors - Pressure and Temperature
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Fig 5: Engine Data Sensors - Oxygen Sensors
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Fig 6: Engine Data Sensors - Electronic Throttle 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 - CMP Sensors and Solenoids
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Fig 11: Ignition Controls - CKP Sensor and Knock Sensors
Courtesy of GENERAL MOTORS CORP.
Fig 12: Fuel Controls - Fuel Injectors, Fuel Rail Pressure Sensor and High Pressure Fuel Pump Actuator