TOYOTA 2011 Tundra - Manual (Page 536)

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3-8. Other interior features
NOTICE
n To avoid the compass malfunctions
Do not place magnets or any metal objects near the inside rear view mirror.
Doing this may cause a malfunction of the compass sensor.
n To ensure normal operation of the compass
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 (moon roof, power win-
dows, etc.) as they may interfere with the calibration.