Global Machinery Company Sierra 1999 - Manual (Page 129)

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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
LED, located to the right of the switch, 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 the COMP switch 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.
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
The compass may need calibration if:
D After five seconds, the display does not show a
compass heading (“N” for North, for example), there
may be a strong magnetic force interfering with the
compass. Such interference may be caused by a
magnetic antenna mount, magnetic note pad holder
or a similar magnetic item.
D The compass does not display the correct heading
and the compass zone variance is set correctly.
In order to calibrate, the letter “C” must be displayed in
the mirror compass windows. If “C” is not displayed,
push in the “COMP” button for approximately eight
seconds or until the letter “C” is displayed.