2008 Chevrolet Corvette Owner's Manual - Page 103

Mirrors Automatic Dimming Rearview Mirror with OnStar® and Compass The vehicle may have an automatic dimming rearview mirror with OnStar®, a compass and map lamps. Three OnStar® buttons are at the bottom of the mirror. See OnStar® System on page 2-45 for more information on the services OnStar® provides. Map Lamps The mirror has map lamps located at the bottom of the mirror. To manually turn the lamps on or off, press the button next to each lamp. Compass Operation The mirror has an eight-point compass display in the bottom of the mirror face. When the ignition and the compass feature are on, the compass will show two character boxes for approximately two seconds. After two seconds, the mirror will display the current compass heading. For example, NE is displayed for north-east. Mirror Operation The mirror automatically changes to reduce glare from headlamps behind you. A time delay feature prevents rapid changing from the day to night positions while driving under lights and through traffic. Compass Calibration If after two seconds the display does not show a compass heading, there may be a strong magnetic field interfering with the compass. Such interference may be caused by a magnetic antenna mount, note pad holder or similar object. If the letter C appears in the compass window, the compass needs calibration. The mirror compass can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display reads a direction. The compass can be placed in calibration mode by pressing and holding the left map light button until a C appears on the compass display. 2-39 P (On/Off): The automatic dimming feature is activated when the vehicle is started. The automatic dimming feature is turned on or off by pressing this button located on the lower part of the mirror. Press and hold the button for up to three seconds to turn this feature on or off. T (Indicator Light): This light will turn on when the automatic dimming feature is active.