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.