OnStar Description and Operation: Notes
WARNING: This page is about a different car, the 2002 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.
The OnStar® system on this vehicle is the F1 system. It consists of the Vehicle Communication Interface Module (VCIM), navigation antenna, cellular antenna, microphone and OnStar® button assembly. The system also interfaces with the vehicle audio system.