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Usually, when something affects the compass readings, the compass will
correct itself after a few days of operating your vehicle in normal
conditions. If the compass still appears to be inaccurate, a manual
calibration may be necessary. Refer to Compass zone/calibration
adjustment.
Most geographic areas (zones) have a magnetic north compass point that
varies slightly from the northerly direction on maps. This variation is four
degrees between adjacent zones and will become noticeable as the
vehicle crosses multiple zones. A correct zone setting will eliminate this
error. Refer to Compass zone/calibration adjustment.
Compass zone/calibration adjustment
1. Determine your magnetic zone by
referring to the zone map.
2. Turn ignition to the on position.
3. Start the engine.
4. Press SETUP to reach the
Compass/Odometer function.
5. Press SELECT to show COMPASS
ZONE <XX> PRESS SELECT TO
CHANGE.
6. Press the SELECT control
repeatedly until the correct zone setting for your geographic location is
displayed on the message center. The range of zone values are from 01
to 15 and “wraps” back to 01.
7. To exit the zone setting mode, and to “lock in” your change, press and
release the SETUP control.
Perform compass calibration in an open area free from steel structures
and high voltage lines. For optimum calibration, turn off all electrical
accessories (heater/air conditioning, wipers, etc.) and make sure all
vehicle doors are shut.
8. Press the SELECT control to start the compass calibration function.
9. Slowly drive the vehicle in a circle (less than 3 mph [5 km/h]) until
the CIRCLE SLOWLY TO CALIBRATE COMPASS display changes to
COMPASS CALIBRATION COMPLETED. It will take up to five circles to
complete calibration.
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Instrument Cluster
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2010 Town Car (tow)
Owners Guide, 1st Printing
USA (fus)