Mirror Operation; Compass Calibration - GMC SIERRA 1997 Manual

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Mirror
Operation
The right side of the switch located at the bottom of the
mirror turns the electrochromic mirror
on
and
off.
The
AUTO LED will come on when the electrochromic mirror
is turned on. To turn the mirror on, press and hold the
MIRROR button for three seconds. The mirror will darken
and remain dark until the button is released. To turn the
mirror off, press and release the MIRROR button.
Compass Operation
Press COMP 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.
When cleaning the mirror, use a paper towel or similar
material dampened with glass cleaner. Do not spray
glass cleaner directly on .the mirror as that may cause the
liquid cleaner to enter the mirror housing.
Compass Calibration
If after two 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. If the letter "C" should ever
appear in the compass window, the mirror may
need calibration.
The mirror can be calibrated in one of two ways:
Drive the vehicle in circles at five mph (8 km/h) or
less until the display reads a direction, or
0
Drive the vehicle on your everyday routine.

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