MY 1999 AUDI A6 AVANT'S HEATED STEERING WHEEL WOULD OVERHEAT TO THE POINT I COULD NOT TOUCH IT. IT CAUSED THE IGNITION SWITH'S WIRES TO MELT AND I HAD TO HAVE THE IGNITION SWITCH REPLACED BY AUDI AND THE HEATED WHEEL DEACTIVATED. THE FAILED IGNITION SWITCH CAUSED MY HEADLIGHTS, HORN, WINDSHIELDWIPERS TO NOT WORK. EVERYTHING NOW WORKS AFTER THE SWITCH WAS REPLACED AND THE STEERING WHEEL HEATER DEAVCTIVATED BY MY AUDI DEALER.