2006 Buick Lucerne Owner's Manual - Page 110

Mirror Operation MIRROR: Press this button to turn the automatic dimming feature on or off. For mirrors equipped with OnStar® controls, press and hold this button for several seconds to turn on the automatic dimming feature on or off. Compass Calibration When on, the compass automatically calibrates as the vehicle is driven. If, after two seconds, the display does not show a compass direction, (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. If the letter C should ever appear in the compass window, the compass may need calibration. The compass can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display shows a direction. Mirrors equipped with OnStar® controls can be placed in calibration mode by pressing and holding the on/off button until a C is shown in the compass display. See DIC Controls and Displays on page 3-50 for more information regarding compass calibration and compass variance. O(On/Off): The indicator light will come on when this feature is on. The automatic dimming feature will go on each time the vehicle is started. Compass Operation COMPASS: Press and hold this button to turn the compass feature on or off. For mirrors equipped with OnStar® controls, briefly press the on/off button to turn the compass on or off. When the ignition and the compass feature are on, the compass will show two character boxes for about two seconds. After two seconds, the compass will display the direction of the vehicle. 2-34