GMC 2002 Envoy - Manual (Page 122)

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2. Press and hold the on/off button for six seconds.
Release the button when “ZONE” is displayed.
The number shown is the current zone number.
3. Scroll through the zone numbers that appear in the
compass/temperature window on the mirror by
pressing the on/off button. Once you find your zone
number, release the button. After about four seconds,
the mirror will return to the compass and
temperature display, and the new zone number will
be set.
Electrochromic Day/Night Rearview Mirror
with Compass, Temperature and OnStar
R
Your vehicle may have an automatic - dimming rearview
mirror with a compass, temperature display and the
OnStar system.
This is the on/off button.
There are three buttons for the OnStar system. See your
dealer for more information on the system and how to
subscribe to OnStar. See “OnStar
R
System” in the Index
for more information about the services OnStar provides.