2008 GMC Sierra 1500 Pickup Owner's Manual - Page 115

Compass Calibration The compass may need calibration if one of the following occurs: Outside Power Mirrors If your vehicle is equipped with outside power mirrors, the controls are located on the driver's door armrest. • After approximately five seconds, the display does not show a compass heading (N for North, for example), there may be a strong magnetic field interfering with the compass. Such interference may be caused by a magnetic antenna mount, magnetic note pad holder or a similar magnetic item. • The compass does not display the correct heading and the compass zone variance is set correctly. In order to calibrate, CAL must be displayed in the mirror compass windows. If CAL is not displayed, push the on/off button for approximately 12 seconds or until CAL is displayed. The compass can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display reads a direction. • Press (A) to select the driver's side mirror. Then press the arrows located on the four-way control pad to adjust the mirror. Press (A) again to deselect the mirror. • Press (B) to select the passenger's side mirror. Then press the arrows located on the four-way control pad to adjust the mirror. Press (B) again to deselect the mirror. This mirror has the following features. Cleaning the Mirror When cleaning the mirror, use a paper towel or similar material dampened with glass cleaner. Do not spray glass cleaner directly on the mirror as that may cause the liquid cleaner to enter the mirror housing. 2-39