LEMON Manuals
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Wiring Schematics
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OnStar Schematics
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OnStar Schematics
WARNING:
This page is about a different car, the 2011 Chevrolet Cruze. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: OnStar Power, Ground, Serial Data, Microphone, and Display Wiring Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: OnStar Antenna Wiring Schematic
Courtesy of GENERAL MOTORS CORP.