'05 C230 STEERING WHEEL CONTROLS AND HORN NOT WORKING. THEY JUST STOPPED WORKING ONE DAY , I OWN THE CAR SINCE NEW AND NEVER HAD A PROBLEM. I CANT FIGURE OUT WHAT IS WRONG, THERE IS NO FUSE FOR THESE CONTROLS IN THE FUSE DIAGRAM IT IS LISTED AS "ELETRICAL". I HAVE SWAPPED ALL THE RELAYS....STILL NO LUCK. IF ANYONE HAS ANY IDEA OF A RESOLUTION , PLEASE HELP !!!!!

 

sounds like you have a bad steering column control module-of course this is a very educated guess but definately recomend getting it diagnosed properly