My rear window on my 1993 altima will power up from the driver consol but
when it reaches the top, it automatically goes back down without pushing
the down button. Therefore, when it reaches the top, I turn the rear
window power lock button on and it stays up.  When you unlock it the
window goes back down.   What and where is the problem?   The controls on
the door will not operate the window.  There is a buzzing sound in the
door when the button is pushed, but it cycles only up and down without
stopping.

Thanks for your help.