WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Module Power, Ground, and Serial Data
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Fig 2: 5-Volt and Low Reference
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Fig 3: Engine Data Sensors - Pressure and Temperature
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Fig 4: Engine Data Sensors - Heated Oxygen Sensors
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Fig 5: Engine Data Sensors - Throttle Controls
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Fig 6: Ignition Controls - Ignition Control Module