I have a 1992 525I which is new in my hands and I am experiencing a funny thing with my windows. I know the driver's side window goes all the way up or down with one touch. But the passenger's side has sometimes gone down, as well as up, with one touch, but most of the times I have to hold the bottun for it to move. Same thing with the rear windows. How are they suppose to work? I hope they are all one touch! Thank You!