Toyota 2008 FJ Cruiser Owner's Manual page 279

3-5. Other interior features
NOTICE
n To avoid the compass malfunctions
Do not place magnets or any metal objects on or near the accessory meter.
Doing this may cause a malfunction of the compass sensor.
To ensure normal operation of the compass
n
l Do not perform circling calibration of the compass in a place where the
earth's magnetic field is subject to interference by artificial magnetic fields.
l During calibration, do not operate electric systems (power windows, etc.)
as they may interfere with the calibration.
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