Automatic Dimming Rearview Mirrorwith Compass

Your vehicle may have an automatic-dimming rearview mirror with a compass.

on/off button for the (On/Off): This is the on/off button for the automatic dimming feature and compass.

See also:

Starting the Vehicle with a Low Transmitter Battery
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Driving Across an Incline
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Reporting Safety Defects to General Motors
In addition to notifying NHTSA (or Transport Canada) in a situation like this, please notify General Motors. Call 1-800-521-7300, or write: Buick Customer Assistance Center P.O. Box 33136 Detroit, M ...