Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not operate if the battery is discharged or disconnected.
See also:
Heated Mirrors
For vehicles with heated mirrors:
(Rear Window Defogger):
Press to heat the mirrors.
See “Rear Window Defogger” under
Automatic Climate Control System for more information. ...
Horn
Press near or on the horn symbols on your
steering wheel pad to sound the horn. ...
Power Mirrors
Controls for the outside power mirrors are located on the driver door.
1. Turn the control knob to the L (left) or R (right) selecting the driver or passenger mirror.
2. Push the control knob to t ...