2009 Buick Lucerne Owner's Manual - Page 118

Mirrors Automatic Dimming Rearview Mirror The vehicle may have an automatic dimming inside rearview mirror with OnStar® and/or a compass display. Vehicles with OnStar have three additional control buttons located at the bottom of the mirror. See your dealer/retailer for more information on the system and how to subscribe to OnStar. See OnStar® System on page 2-46 for more information about the services OnStar provides. Compass Compass Operation There is a compass display in the upper right corner of the mirror. Compass Calibration Press and hold O to activate the compass calibration mode. CAL displays in the compass window on the mirror. If after a few 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. Interference can be caused by a magnetic antenna mount, note pad holder, or similar object. If CAL displays in the compass window, the compass may need to be reset or calibrated. 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. O (On/Off): Press to turn the dimming feature and/or compass display on or off. Automatic Dimming Mirror Operation Automatic dimming reduces the glare from the headlamps of the vehicle behind you. The dimming feature comes on and the indicator light illuminates each time the vehicle is started. Cleaning the Mirror Do not spray glass cleaner directly on the mirror. Use a soft towel dampened with water. 2-34