GM Service Manual Online
For 1990-2009 cars only

When on, an electrochromic mirror automatically dims to the proper level to 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 will both appear in the display at the same time. The dual display can be turned on or off by briefly pressing either the TEMP or the COMP button.

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 three seconds until the display blinks F° or C°. Press and release the TEMP button to toggle between the Fahrenheit and Celsius readings. After five seconds of inactivity, the display will stop blinking and display the last selection made.

If an abnormal reading is displayed, please consult your dealer.

Electrochromic Mirror Operation

The time period you need to press and hold the TEMP button to turn the electrochromic feature on or off is six 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.

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:

    • After 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.

In order to calibrate, "C" must be displayed in the mirror compass windows. If "C" is not displayed, push in the "COMP" button for approximately eight seconds or until "C" is displayed.

The compass can be calibrated in on of two ways:

    • Drive the vehicle in circles at five mph (8 km/h) or less until the display reads a direction, or
    • drive the vehicle on your everyday routine and after several turns the compass will become calibrated and will display a direction.

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 you live 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. Use the COMP button located at the bottom of the mirror.
  2. Press and hold the COMP button for three seconds. until a zone number appears in the display.
  3. Find your current location and variance zone number on the following zone map.
  4. 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 in, the display will show a compass direction within a few seconds.