Gmc 2007 Sierra User Manual Page 181

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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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