SEAT HEATER ON 2004 BMW 530I (E60) OVERHEATED AND BECAME VERY HOT. SMELL OF BURNING. RESULTED IN BLACK CHARRING TO THE LEATHER SEAT. NO ACTUAL FLAMES FROM OVERHEATING. SEAT HAD PREVIOUSLY CAUGHT ON FIRE RESULTING IN CALL TO FIRE DEPARTMENT TO EXTINGUISH SMOLDERING SEAT MATERIAL. ENTIRE SEAT WAS REPLACED IN AUGUST, 2005, AFTER PRIOR RECALL REMEDY (NHTSA ID NUMBER 04V575000) WAS SUPPOSEDLY COMPLETED. *TR