Chevrolet 2007 Colorado Owner's Manual page 143

If the display reads CAL, the compass needs
to be calibrated. For more information, see
"Compass Calibration" following.
To adjust between Fahrenheit and Celsius:
1. Press and hold the on/off button for
approximately four seconds until either
a flashing F or C appears.
2. Press the button again to change the display
to the desired unit of measurement. After
approximately four seconds of inactivity,
the new unit will be locked in and the
compass/temperature display will return.
If an abnormal temperature reading is displayed
for an extended period of time, see your
dealer/retailer. Under certain circumstances, a
delay in updating the temperature is normal.
Automatic Dimming Mirror Operation
The automatic dimming mirror comes on each time
the ignition is turned to start. To turn the automatic
dimming feature off or back on, press the on/off
button. The indicator light on the mirror is lit when
the automatic dimming feature is on.
Compass Calibration
The compass may need calibration if one of the
following occurs:
•
After approximately 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, CAL must be displayed
in the mirror compass windows. If CAL is
not displayed, push the on/off button for
approximately 12 seconds or until CAL is
displayed.
The compass can be calibrated by driving the
vehicle in circles at 5 mph (8 km/h) or less until
the display reads a direction.
143