Chrysler 2006 PT Cruiser Sedan - Manual (Page 236)

North is great enough to cause the compass to give false
readings. In order to ensure compass accuracy, the com-
pass variance should be properly set according to the
compass variance map zone that the vehicle is in.
NOTE: Magnetic materials should be kept away from
the Instrument Panel. This is where the compass sensor is
located.
236 UNDERSTANDING YOUR INSTRUMENT PANEL