If the vehicle has this feature, an automatic dimming mirror automatically dims to the proper level to minimize glare at night from lights behind your vehicle. For more information about OnStar®, see OnStar® System .

The automatic dimming mirror function is turned on each time the ignition is started. A light near the on/off button will come on to indicate the automatic dimming is on.

Press the on/off button for about four seconds to manually turn the automatic dimming function on or off.

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.