Lexus 2003 LS Owner's Manual page 79

NOTICE
Do not put magnets or a metal object near the audio
system. Doing this may cause malfunction of the
compass sensor.
CALIBRATING THE COMPASS
The direction display on the compass deviates from the true
direction determined by the earth's magnetic field. The
amount of deviation varies according to the geographic
position of the vehicle.
If you cross over the area divided as shown in the illustration,
the compass will deviate. If it is necessary to calibrate the
compass (deviation calibration), take your vehicle to your
Lexus dealer. Even if you do not cross over, the compass may
sometimes deviate. If this happens, perform "DRIVE IN
CIRCLES" calibration as shown on the next page.
GAUGES, METERS AND SERVICE REMINDER INDICATORS
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