2008 Chevrolet Avalanche Owner's Manual - Page 130
2008 Chevrolet Avalanche Manual
Page 130 highlights
Automatic Dimming Mirror Operation Press and hold the TEMP button for approximately eight seconds to turn the automatic dimming feature on or off. The indicator light to the left of the TEMP button will turn on or off to indicate when the feature is on. Once the mirror is turned off, it will remain off until it is turned back on, or until the vehicle is restarted. • The compass does not display the correct heading and the compass zone variance is set correctly. In order to calibrate, CAL must be displayed in the mirror compass windows. If CAL is not displayed, push in the COMP button for approximately eight 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. Compass Operation Press the COMP button once briefly to turn the compass on or off. When the ignition is started and the compass feature is on, the compass will show two character boxes for approximately two seconds. After two seconds, the mirror will display the compass heading. Compass Variance The mirror is set in zone eight upon leaving the factory. It will be necessary to adjust the compass to compensate for compass variance if the vehicle is outside zone eight. Under certain circumstances, as during a long distance cross-country trip, it will be necessary to adjust for compass variance. Compass variance is the difference between earth's magnetic north and true geographic north. If not adjusted to account for compass variance, your compass could give false readings. To adjust for compass variance: 1. Find your current location and variance zone number on the following zone map. Compass Calibration The compass may need calibration if one of the following occurs: • If CAL is displayed while driving in the vehicle. • 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. 2-54