I WAS USING THE WARMING SEATS AND HAD PULLED UP TO THE POST OFFICE TO DROP A LETTER IN THE BOX. THE LETTER HAD FALLEN TO THE GROUND. I GOT OUT AND PLACED THE LETTER IN THE BOX. I GOT BACK IN THE CAR AND PULLED UP TO KEEP FROM HOLDING UP TRAFFIC WHILE I HAD REPLACED MY SEAT BELT. A SUV HAD CROSSED MY PATH WHEN I SMELLED SOMETHING BURNING. I ASSUMED IT WAS EXHAUST FROM THE SUV. I WAS ABOUT TO PULL OFF THE PARKING LOT WHEN I NOTICED THICK WHITE SMOKING COMING FROM MY SEAT. I IMMEDIATELY TURNED OFF THE SEAT WARMER. THE SMOKE DISSIPATED AFTERWARDS.I CONTINUED TO DRIVE THE CAR ABOUT 1/2MILE TO THE GROCERY STORE. I GOT OUT AND NOTICED A BURN ON SEAT. *TR