Recently, my driver side window has been making a loud 'clunk' as it hits the end of its upward travel, as opposed to the softer stop that the other 3 windows have. It goes down nicely though.
Does anyone know how this is supposed to work? In other words, I think something shuts off the motor just before the window glass reaches the physical limit of its upward movement, so it won't 'bang' when closing, so if I knew what does this, I'd know what to fix. (and if the job is worth doing, as it does mean door panel removal first).

__________________
1986 560SL
2002 Toyota Camry
1993 Lexus