My driver's door power window motor stopped working. Replaced motor (Dorman). New motor was shaky and wouldn't stop when going down. Replaced motor again (Dorman), same thing. Regulator became damaged, replaced (Dorman), smoother, still won't stop with auto button, or holding down button. At some point glass came out of regulator and track. Replaced glass. Window goes up and down smoothly, but just doesn't stop when going down and tries to keep going. I don't see a limit switch or circuit for it. I see there is a relay and a fuse for the auto down. What tells the motor to stop driving current? Thank you.

 

The GEM controls turning off the power to the motor during the Auto Down function. The other possibility is the window switch is sticking.

 

Thank you for the GEM info. I don't believe the switch is sticking because holding down the passenger side switch doesn't cause it to keep going and the motor stops when going up when the switch is still depressed. Is this a known failure for the GEM module? I'll swap it out, but hate to shotgun parts. I was hoping someone had fixed the same issue that could advise, or provide some troubleshooting guidance to pin point the problem. Thank you