2003 Chevrolet Avalanche Owner's Manual - Page 120

Compass Calibration The compass may need calibration if one of the following occurs: 0 Passenger Air Bag Indicator Your vehicle may be equipped with a passenger air bag indicator, on the mirror glass, just above the buttons. If your vehicle has this feature, the mirror will display the word ON, or an air bag symbol in Canada, when the passenger air bag is enabled. For more information, see Passenger Sensing Systemon page 1-6I. After approximately five 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 holder or a similar magnetic item. The compass does not display the correct heading and the compass zone variance is set correctly. Cleaning the Mirror 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. In order to calibrate, CAL must be displayed in the mirror compass windows. If CAL is not displayed, push the on/off button for approximately 12 seconds or until CAL is displayed. The compass can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display reads a direction. Automatic Dimming Rearview Mirror with Compass and Temperature Display If your vehicle is equipped with an electrochromic mirror, it will,when on, automatically dim to proper level to the minimize glare from lights behind you after dark. The mirror also includes a display in the upper right corner of the mirror face. The compass reading and the outside temperature willboth appear in the display at the same time. The dual displaycan be turned on oroff by briefly pressing either theTEMP or the COMP button. 2-47