See also:

Cellular and GPS Antennas
Avoid placing items over or near the antenna to prevent blocking cellular and GPS signal reception. Cellular reception is required for OnStar to send remote signals to the vehicle. ...

Compass Calibration
The compass can be manually calibrated. Only calibrate the compass in a magnetically clean and safe location, such as an open parking lot, where driving the vehicle in circles is not a danger. I ...

Comfort and Convenience
Select the Comfort and Convenience menu and Chime Volume will be displayed. Chime Volume This allows the selection of the chime volume level. Press the TUNE/MENU knob when Chime Volume is highlight ...