1997 GMC Suburban Owner's Manual - Page 119

Compass Operation Press COMP to turn the compass on or off. When the ignition and the compass feature are 011.rne compass will show two character boxes for approximately two seconds. After two seconds, the mirror will display the compass heading. 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. Compass Calibration Mirror Operation The right side of the switch located at the bottom of the mirror turns the electrochromic mill-or onand off. The AUTO LED will come on when the electrochromic mirror is turned on. To turn the mirror on, press and hold the MIRROR button for three seconds. The mirror will darken and remain dark until the button is released. To turn the mirror off, press and release the MIRROR button. If after two seconds the display does not show a compass heading ("N" for North, for example), there may be a strong magnetic field interfering with the compass. Such interference may be caused by a magnetic antenna mount, magnetic note pad Imlder or a similar magnetic item. If the letter "C" should ever appear in the compass window, the mirror may need calibration. The mirror can be calibrated i n one of two ways: 0 Drive the vehicle in circles at five mph (8 kmh) or less until the display reads a direction, 0 1 Drive the vehicle on your everyday routine. 0 2-45