+1Just pull up until it "clicks" after that it will keep going up.
This.Do you have a convertible? It doesn't work on convertibles.
this was infamous in the 05s. have not experienced it in my 15 yet, but, i believe the reset function is the same.My 05 would have this problem (only in the winter for some reason) and I would have to reset the windows every once in a while. I would imagine its the same process for the S550 but can't confirm. Anyway, with the window all the way up; push and hold down, continue to hold the button for another 2 seconds once the window is completely down. Next push and hold up, continue to hold for another 2 seconds after the window is all the way up. See if this fixes the issue (assuming you don't have a convertible), certainly won't hurt to try. Also, it has to be done for each individual window.