DT*: THE CONTACT STATED THE HEATING UNIT ON THE PASSENGER SEAT CAUGHT FIRE. THE VEHICLE WAS PARKED WHEN THE CONTACT HEARD FIRE TRUCKS. THE VEHICLE WAS FULL OF SMOKE. THERE WERE FLAMES COMING FROM THE PASSENGER SEAT. A REPRESENTATIVE FROM DAIMLER/CHRYSLER CAME OUT TO INSPECT THE VEHICLE. THE FIRE DEPARTMENT WAS NOTIFIED AND DETERMINED THE FIRE WAS OF AN ELECTRICAL NATURE. THE CONTACT REPORTS HAVING NO PROBLEMS WITH THE VEHICLE PRIOR TO THE INCIDENT.