2008 Hummer H2 Owner's Manual - Page 128

Automatic Dimming Mirror Operation O: Press this button to turn the automatic dimming feature on or off. The indicator light to the left of the button will turn on 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. Compass Operation Press the compass/temperature button once briefly to turn the compass on or off. Compass Calibration The compass may need calibration if the following occurs: Temperature Display The temperature can be displayed by pressing the compass/temperature button. Pressing the compass/temperature button once briefly, will toggle the temperature reading on and off. To alternate the temperature reading between Fahrenheit and Celsius, press and hold the compass/temperature button for approximately four seconds until the display blinks F and C. Press and release the compass/temperature 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. If an abnormal reading is displayed, for an extended period of time, please consult your dealer/retailer. Under certain circumstances, a delay in updating the temperature is normal. • 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 compass/temperature button for approximately eight seconds or until CAL is displayed. The compass can only be calibrated by driving the vehicle forward in circles at 5 mph (8 km/h) or less until the display reads a direction. Do not attempt to calibrate the compass by driving in reverse. 2-46