Well I have been having this problem for quite sometime now... I own a 2001 C320 and am new to the forums... I tried searching under many different ways of wording this but cant seem to find anything. When I shut my vehicle off, the fan in the radio stay on until the battery is completly toast. Ive already ruled out the electronic seats cuz they are both unplugged and the battery is still dead when I let it sit over night. Is there a way to disconnect the fan or whatever is making that noise in the radio? I currently have my dash appart and am wonding if there is a wire that I can cut that will stop that current of power or sometype of relay? Thanks in advance and hope someone can help this problem