1999 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 129

yellowblue Compass Operation Press the COMP switch once briefly to turn the compass on or off. 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 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 The compass may need calibration if: D After five seconds, the display does not show a compass heading ("N" for North, for example), there may be a strong magnetic force interfering with the compass. Such interference may be caused by a magnetic antenna mount, magnetic note pad holder or a similar magnetic item. D The compass does not display the correct heading and the compass zone variance is set correctly. In order to calibrate, the letter "C" must be displayed in the mirror compass windows. If "C" is not displayed, push in the "COMP" button for approximately eight seconds or until the letter "C" is displayed. Mirror Operation The right side of the switch located at the bottom of the mirror turns the electrochromic mirror on and off. The LED, located to the right of the switch, 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. 2-57