Lexus ES300 Owner's Manual page 119

Your vehicle is out of the set zone. Refer to the "Calibrating the
compass" in this section to set the zone number.
The compass works to calibrate the direction automatically
while the vehicle is in motion, if deviation is small.
For additional precision or for complete calibrating, see
"Calibrating the compass" below.
If the direction is not indicated or the system does not operate
properly, contact your Lexus dealer.
"Compass sensor
NOTICE
Do not put magnets or a metal object on or near the
inside rear view mirror of the vehicle. Doing so may
cause malfunction of the compass sensor in the mirror.
COMFORT ADJUSTMENT
Calibrating the compass (deviation calibration)
The direction display on the compass deviates from the true
direction determined by the earth's magnetic field. The angle
of deviation varies according to the geographic position of the
vehicle.
To adjust this deviation, stop the vehicle, then push and hold
the "COMP" switch until the zone number appears on the
display. Then push the "COMP" switch, referring to the
following map to select the number of the zone where the
vehicle is.
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