Cadillac 2002 Eldorado Manual page 106

The mirror can be calibrated by driving the vehicle in
circles at 5 mph (8 km/h) or less until the display
reads a direction.
The compass can be placed in calibration mode by
pressing and holding the on/off button until a C is
shown in the compass display.
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 zone eight.
Under certain circumstances, as during a long distance
-
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.
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 on/off button until a zone number
appears in the display.
3. Once the zone number appears in the display,
press the on/off button quickly until the correct
zone number appears in the display. Stop pressing
the button and the mirror will return to normal
operation. If C appears in the compass window,
the compass may need calibration. See "Compass
Calibration" explained previously.
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.
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