Your vehicle may have a manual rearview mirror with OnStar®, compass and temperature display located in the upper right corner.

Control buttons for the OnStar® system are at the bottom of the mirror. See your GM dealer for more information about the OnStar® system. Also, see OnStar® System for more information about the services OnStar® provides.

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.

While sitting in a comfortable position, adjust the rearview mirror so you can see clearly behind your vehicle. Grip it in the center and move it up or down and side to side. The day/night control, located at the bottom of the mirror, adjusts the mirror to reduce headlamp glare from behind during evening or dark conditions.

When the ignition and the compass/temperature feature are on, character boxes will appear for about two seconds. After two seconds, the mirror will display the direction the vehicle is facing and the outside temperature.

To set the temperature in Fahrenheit or Celsius, do the following:

1. Press and hold the on/off button until either a flashing F or C appears.
2. Press the button again to change the display to the desired unit of measurement. After about four seconds of inactivity, the new unit will be locked in and the compass/temperature display will return.

When on, the compass automatically calibrates as the vehicle is driven. If, after two seconds, the display does not show a compass direction, 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. If the letter C should ever appear in the compass window, the compass may need calibration.

Press and hold the on/off button for nine seconds to activate the compass calibration mode. CAL will be displayed in the compass window on the mirror.

The mirror can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display shows a direction.

Compass variance is the difference between earth's magnetic north and true geographic north. The mirror is set to 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 conditions, such as during a long-distance, cross-country trip, it will be necessary to adjust for compass variance. If not adjusted to account for compass variance, the compass could give false readings. To adjust for compass variance do the following:

1. Find the current location and variance zone number on the following zone map.



2. Press and hold the on/off button until a zone number appears in the display.
3. Once a zone number appears in the display, press the on/off button quickly until the correct zone number appears in the display. If C appears in the compass window, the compass may need calibration. See "Compass Calibration" explained previously.