2003 GMC Sierra 1500 Pickup Owner's Manual - Page 142

Temperature Display The temperature can be displayed by pressing the TEMP button. Pressing the TEMP button once briefly, will toggle the temperature reading on and off. To alternate the temperature reading between Fahrenheit and Celsius, press and hold the TEMP button for approximately four seconds until the display blinks O F and "C. Press and release the TEMP button to toggle between the Fahrenheit and Celsius readings. After approximately four seconds of inactivity, the display will stop blinking and display the last selection made. Press and release the TEMP button to toggle the temperature display between Fahrenheit or Celsius. If an abnormal reading is displayed, please consult your dealer. Compass Operation Press the COMP button 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 one of the following occurs: Electrochromic Mirror Operation The time period you need to press and hold the TEMP button to turn the electrochromic feature on or off is approximately eight seconds. The indicator light to the right of the TEMP button will still turn on or off to show you when the electrochromic feature is activated. Once the mirror is turned off, it will remain off until it is turned back on, or until the vehicle is restarted. 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. The compass does not display the correct heading and the compass zone variance is set correctly. 2-55