I TURNED ON MY 2007 MERCEDES GL450 IN MY DRIVEWAY TO WARM IT UP AND 1 MINUTE LATER THE HORN CONTINUALLY WENT OFF. I TURNED THE CAR OFF AND THE HORN CONTINUED. SMOKE BEGAN FROM THE PASSENGER REAR TAIL LIGHT, THEN A FLAME. 911 WAS CALLED THE MOMENT WE SAW SMOKE. WITHIN SECONDS THE BACK SEAT WAS ENGULFED IN FLAMES AND THEN THE ENTIRE CAR. THE FLAMES WERE AS HIGH AS MY 2 STORY HOME. THERE IS NOTHING LEFT OF THIS CAR. THE AMOUNT OF BROKEN GLASS FROM ALL THE WINDOWS BLOWING OUT DOWN MY DRIVEWAY IS UNBELIEVABLE. *TR