GMC 2002 Envoy - Manual (Page 123)

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Automatic Dimming Feature
When turned on, an electrochromic mirror automatically
dims to the proper level to minimize glare from any
headlamps behind you after dark.
The automatic dimming feature is turned on and off by
pressing the far left button, located on the lower part of
the mirror face, for up to three seconds. A light on the
mirror will be lit when the feature is turned on. It will go
out when the feature is turned off.
Temperature Display
The temperature display is in the window in the upper
right corner of the mirror face. The display will show
the temperature in
_F or_C when the compass is on.
Press the on/off button to cycle through
_F, _C, or OFF.
Compass Operation
Press the on/off button once to turn the compass
on or off.
There is a compass display in the window in the upper
right corner of the mirror face. The compass displays a
maximum of two characters. For example, “NE” is
displayed for north
- east.
Compass Calibration
Press and hold the on/off button down for nine seconds
to activate the compass calibration mode. “CAL” will be
displayed in the compass window on the mirror.
The mirror can be calibrated in one of two ways:
D Drive the vehicle in circles at 5 mph (8 km/h) or less
until the display shows “CAL,” or
D drive the vehicle on your everyday routine.
(This method may take longer to calibrate).