DT: THE CONTACT STATED THAT WHILE DRIVING SHE TURNED ON SEAT WARMER AS WELL AS THE HEATER AND SHE DETECTED THE ODOR OF SOMETHING BURNING . SHE TURNED OFF THE HEATER BUT NOT THE SEAT WARMER. SHE CONTINUED DRIVING BUT SENSED A FEELING OF SOMETHING BITING THE SIDE OF HER LEG. SHE DISCOVERED A SPARK COMING FROM A HOLE IN LEATHER SEAT. SHE EXPERIENCED A SMALL BURN TO HER LEG. THERE WERE NO VISIBLE FLAMES ONLY SPARKS. SHE TURNED OFF THE SEAT WARMER AND PULLED OVER. TO EXTINGUISH ANY SPARKS SHE POURED WATER ONTO SEAT. SHE TOOK THE VEHICLE TO A DEALER. MERCEDES WILL REPLACE THE SEAT FREE OF CHARGE. *AK