OnStar Schematics

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Power, Ground, Serial Data, and Antennas Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 2: VCIM to Inside Rearview Mirror Schematic

Courtesy of GENERAL MOTORS CORP.