Convertible top not working , please help

[jubie]

I started a forum a while ago about my 91 500sl convertible top not going down , I was told to have the codes read , I finally did , and we reset it and it worked ( Shortly) , and it once again doesn't work , the codes read , something about speedometer and a obstruction , there was no obstruction and the speedometer works , but I noticed that my miles are not changing , could it be that , any ideas on what I should change and what I can do to fix the problem ??, is there some kind of fuse thing I can change for the speedometer ?? any help will e great , thank you very much ,