GMC 2002 Sierra - Manual (Page 156)

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Electrochromic Mirror Operation
The time period you need to press and hold the TEMP
button to turn the electrochromic feature on or off is
six seconds. The indicator light to the right of the TEMP
button will still turn on or off to show you when the
electrochromic 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.
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 one of the
following occurs:
D After 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.
D 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 in one of two ways:
D Drive the vehicle in circles at five mph (8 km/h) or
less until the display reads a direction, or
D drive the vehicle on your everyday routine and after
several turns the compass will become calibrated and
will display a direction.