I have the same problem and the housing is easy to take to pieces...10 minute job. I got the little faulty motor out in my hand, went to Lexus and they don't sell them, wanted to sell me the whole housing for £300. The motor is like from an airfix kit and cannot cost more than £10. If they replace your housing which they will do, there are 2 motors in there. Can I have the defunct housing and use the good motor? Will pay whatever. John Y