GMC Sierra 2005, Owner'S Manual

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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.
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.
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