(Option)
Your vehicle may have an automatic-dimming rearwiew mirror with a compass and temperature display.
When turned on, an electrochromic mirror automatically dims to the proper level to minimize glare from headlamp behind you after dark. The mirror has a eight-point compass and temperature display in the upper right corner of the mirror face. The display shows the current outside temperature and the vehicle's current direction.
Automatic Dimming Feature
The automatic dimming feature is turned on or off by briefly pressing the COMP button located on the bottom of the mirror face. A light on the mirror will be lit when the feature is turned on. The light will go out when the feature is turned off.
Temperature Display
The temperature can be displayed by pressing the TEMP button. Pressing the TEMP button once briefly, will toggle the temperature reading from Fahrenheit (°F), Celsius (°C), to off.
Compass Operation
Press the COMP button once briefly to turn the compass on or off.
When compass feature is on, the compass will show the direction the vehicle is traveling, with a maximum of two characters.
Compass Calibration
Press the and hold the COMP button down for six seconds to activate the compass calibration mode. If your vehicle has the optional mirror with the compass, temperature display and OnStar® system, press the on/off button for nine seconds. CAL will be displayed in the compass/temperature window on the mirror.
The mirror can be calibrated in one of two ways:
| • | Driving the vehicle in circles at 5 mph (8 km/h) or less until the display |
| • | Drive the vehicle on your everyday routine. (This method may take longer to calibrate.) |
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:
- Find your current location and variance zone number on the following 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.
