The main components of the power window system, the window motor, regulator, window switch, wiring and relay.
The first clue of a failing window regulator are unusual noises from the door as the window is
raised or lowered. Followed by the window moving upward at an angle or dropping suddenly.
The window motor is subjected to extra stress when the window is not moving smoothly and
can cause the motor to fail. Window switches do fail but is less common than the window
regulator.