OnStar Schematics

WARNING: This page is about a different car, the 2007 Pontiac Solstice. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Antenna, DLC, Ground, Inputs, and Power Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 2: Audio Output Schematic

Courtesy of GENERAL MOTORS CORP.