I have a 1997 S500 and recently had the compressor replaced. Went to get car and it wouldn't not start. Realized the Ac control panel was not on or operational. Radio worked fine however. Mechanic checked fuses and 19 and 20 were blown. Replaced those fuses and the Ac display came up fine and the car started. Now two weeks later ingot out this morning and car won't start. Checked fuses again and both were blown. Replaced them both and now as soon as the key is turned on but before cranking fuse 19 instantly blows. The diagram shows #19 as the seat belt speed warning device. Can't understand why this would allow the car not to start. Car has always run perfectly and has never not started until now. Please help I need car back running again before holidays.