I don’t know how to get to the rear window motor on this car. A friend has a newer model and can get to his through a panel on the door jamb. there isn’t one on mine. I took the interior panel off but the modifications for the top obscure the motor. Anyone dealt with this before?
You may want to find a Celica forum and ask there. The convertible was created in the US by ASC, and I bet there aren’t that many still on the road.