The automatic dimming mirror dims to the proper level to minimize glare from lights behind you after dark.
The mirror includes a compass reading and outside temperature display in the upper right corner of the mirror. The dual display can be turned on or off by pressing either the TEMP or the COMP button.
Temperature Display
The temperature can be displayed by pressing the TEMP button. Press the TEMP button once briefly to 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 F and C. Press and release the TEMP button to toggle between the Fahrenheit and Celsius readings. After about four seconds of inactivity, the display will stop blinking and display the last selection made.
If an abnormal temperature reading is displayed for an extended period of time (30 minutes), see your GM dealer. Under certain circumstances, a delay in updating the temperature is normal.
Automatic Dimming Mirror Operation
Press and hold the TEMP button for about eight seconds to turn the automatic dimming feature on or off. The indicator light to the right of the TEMP button will turn on or off to show when the automatic dimming 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.
Compass Operation
Press the COMP button 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 about two seconds. After two seconds, the mirror will display the compass heading.
Compass Calibration
The compass may need calibration if one of the following occurs:
| • | If CAL is displayed while driving in the vehicle. |
| • | After about 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, a 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. |
In order to calibrate, CAL must be displayed in the mirror compass windows. If CAL is not displayed, push the COMP button for about eight seconds or until CAL is displayed.
The compass can be calibrated by driving the vehicle in circles at five mph (8 km/h) or less until a direction is displayed .
Compass Variance
Compass variance is the difference between earth's magnetic north and true geographic north. If not adjusted to account for compass variance, the compass could give false readings.
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.
To adjust for compass variance, do the following:
- Find your current location and variance zone number on the zone map.
- Press and hold the COMP button for five seconds until a zone number appears in the display.
- Press the COMP button on the bottom of the mirror until the new zone number appears in the display. After you stop pressing the button, the display will show a compass direction within a few seconds.
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.
