GMC 2004 Sierra - Manual (Page 152)

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
approximately four seconds 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.
Automatic Dimming Mirror Operation
The time period you need to press and hold the TEMP
button to turn the automatic dimming feature on or
off is approximately eight seconds. The indicator light to
the left of the TEMP button will still turn on or off to
show you when the automatic dimming feature is
activated. Once the mirror is turned off, it will remain off
until it is turned back on, or until the vehicle is
restarted.
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.
In order to calibrate, CAL must be displayed in the
mirror compass windows. If CAL is not displayed, push
in the COMP button for approximately eight seconds
or until CAL is displayed.
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