FixVault

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
GM2461716Courtesy of GENERAL MOTORS CORP.
Fig 2: OnStar Antenna Wiring Schematic
GM2461718Courtesy of GENERAL MOTORS CORP.