Diagnosis And Testing - Power Windows: Notes

If a power window operates, but the glass moves slowly or stalls at any point during its travel, the problem could be the result of an improperly installed door glass or the glass binding against the glass run weatherstrips. Be certain to confirm that the glass moves freely and smoothly up and down by disconnecting the glass from the regulator and moving it through its complete travel manually before attempting to diagnose or repair the power window system switches or motors.