Chevrolet 2007 TrailBlazer Owner's Manua page 141

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 until the display blinks F and C.
Press and release the TEMP button to toggle
between the Fahrenheit and Celsius readings.
After approximately four seconds of inactivity,
the display will stop blinking and display the last
selection made.
If an abnormal reading is displayed, for an
extended period of time, please consult your
dealer. Under certain circumstances, a delay in
updating the temperature is normal.
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.
Compass Calibration
The compass may need calibration if one of the
following occurs:
•
If CAL is displayed while driving in the vehicle.
•
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.
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