See also:

How OnStar Service Works
Automatic Crash Response, Emergency Services, Crisis Assist, Stolen Vehicle Assistance, Vehicle Diagnostics, Remote Door Unlock, Roadside Assistance, Turn-by-Turn Navigation, and Hands-Free ...

If the System Needs Service
If the navigation system needs service and the steps listed here have been followed but there are still problems, see your dealer for assistance. ...

ROTATE CONTROL TO OFF POSITION
If the vehicle has the keyless access system, this message displays when the ignition is in ACC/ACCESSORY and the shift lever has just been moved to P (Park). The message displays as a rem ...