System Description: Overview: OnStar

Because the OnStar system provides emergency assistance, it has the highest priority for audio output. Aside from sharing the audio unit, the OnStar system is essentially self-contained. It utilizes it's own microphone, control "keyboard", and GPS/Cellular antenna. See the OnStar section for troubleshooting. If a paired phone is present, the "CALL" button is green on the "Calculate route to." screen.