Compass Variance; Compass Operation; Compass Calibration - Buick 2004 LeSabre Owner's Manual

Mirror Operation
MIRROR: Press this button to turn on the automatic
dimming feature. Press it again to turn off the automatic
dimming feature.
O (On/Off): For mirrors equipped with OnStar
controls, press and hold this button for several seconds
to turn on the automatic dimming feature. Press and
hold it again to turn the automatic dimming feature off.
The green indicator light will come on when this
feature is active. The automatic dimming feature will be
active each time the vehicle is started.

Compass Operation

COMPASS: Press this button once to turn the compass
on or off.
O
(On/Off): For mirrors equipped with OnStar
press this button once to turn the compass on or off.
When the ignition and the compass feature are on, the
compass will show two character boxes for about
two seconds. After two seconds, the mirror will display
the compass heading.

Compass Calibration

When on, the compass automatically calibrates as the
vehicle is driven. If, after two seconds, the display
does not show a compass heading (N for North, for
example), there may be a strong magnetic field
2-34
interfering with the compass. Such interference may be
caused by a magnetic antenna mount, magnetic
note pad holder or a similar magnetic item. If the letter
C should ever appear in the compass window, the
compass may need calibration.
®
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.
Mirrors equipped with OnStar
in calibration mode by pressing and holding the
on/off button until a C is shown in the compass display.

Compass Variance

Compass variance is the difference between earth's
magnetic north and true geographic north. The mirror is
set in zone eight upon leaving the factory. It will be
necessary to adjust the compass to compensate for
®
controls,
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. 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.
®
controls can be placed