Hummer 2003 H2 Owner's Manual page 136

Electrochromic Mirror Operation
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The electrochromic (self dimming) mirror function is
turned on automatically each time the ignition is started.
To operate the electrochromic mirror do the following:
1. Make sure the green indicator light, located to the
left of the COMP button, is lit. If it's not, press and
hold the TEMP button for six seconds until the
green light comes on, indicating that the mirror is
in electrochromic (self
2. Turn off the electrochromic mirror function by
pressing and holding the TEMP button for six
seconds until the green indicator light turns off.
Compass Variance
The mirror is set in zone eight upon leaving the factory.
It will be necessary to adjust the compass to compensate
for compass variance if you live outside of zone eight.
Under certain circumstances, as during a long distance
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cross country trip, it will be necessary to adjust for
compass variance. Compass variance is the difference
between earth's magnetic north and true geographic
north. If not adjusted to account for compass variance,
your compass could give false readings.
2-54
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dimming) mode.
To adjust for compass variance do the following:
1. Find your current location and variance zone number
on the following zone map.
2. Press and hold the COMP button for nine seconds or
until a Z and a zone number appears in the display.
The compass is now in zone mode.