Chevrolet 2003 Tahoe Owner's Manual page 135

Electrochromic Mirror Operation
The time period you need to press and hold the TEMP
button to turn the electrochromic feature on or off is
approximately eight 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:
e
e
e
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 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
drive the vehicle on your everyday routine and after
several turns the compass will become calibrated
and will display a direction.
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