See also:

Auto Fan Speed
This will allow you to select the automatic fan speed. This feature sets the climate control fan speed to maintain the interior temperature. Press the MENU/SELECT knob when Auto Fan Speed is highl ...

Sunroof
If the vehicle has a power sunroof it will only operate when the ignition is in ON/RUN or ACC/ACCESSORY, or when Retained Accessory Power (RAP) is active. See Ignition Positions (Key Access) ...

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 o ...