MALFUNCTION IN THE DRIVER'S SEAT BACK REST HEATING SYSTEM CAUSED MELTING OF THE UPHOLSTERY AND OF THE OUTER LAYER OF THE DRIVER'S CAR COAT AT THE MELTED SEAT-BACK UPHOLSTERY. NO OVERT FIRE. ACTION TAKEN: SWITCHED OFF SEAT HEAT. BARE WIRES VISIBLE INSIDE THE SEAT-BACK. *TR