Automatic Dimming Rearview Mirrorwith OnStar ® and CompassYour vehicle may have an automatic dimming rearviewmirror with a compass display. The mirror alsocontains OnStar® controls. For more information seeOnStar ® System on page 2-48.The mirror includes an eight-point compass display inthe upper right corner of the mirror face. When on,the compass automatically calibrates as the vehicleis driven.Mirror OperationO(On/Off): Press and hold the button, located onthe lower left side of the mirror face, for aboutthree seconds to turn the automatic dimming feature onor off. The indicator light will illuminate when thisfeature is active. The automatic dimming feature isactive each time the vehicle is started.Compass OperationPress the on/off button once to turn the compasson or off.When the ignition and the compass feature are on,the compass will show two character boxes for abouttwo seconds. After two seconds, the mirror will displaythe compass heading.Compass CalibrationIf after two seconds, the display does not show acompass heading (for example, N for North), there maybe a strong magnetic field interfering with the compass.Such interference may be caused by a magneticantenna mount, magnetic note pad holder or a similarmagnetic item. If the letter C should ever appear in thecompass window, the compass may need calibration.The mirror can be calibrated by driving the vehicle incircles at 5 mph (8 km/h) or less until the display readsa direction.The compass can be placed in calibration modemanually by pressing and holding the on/off buttonuntil a C is shown in the compass display.2-41
