I have the common failure of these motors on my wagon too. I have stripped both of them done to their individual bits,cleaned and reassembled them. They worked for a week or two,then they failed one after the other again! The Lexus ls400 has the same function and I was wondering if the motors were the same and can be used on the 100 series? I know that there is a repair mod for these but it doesn't seem to last . It doesn't really bother me but it would be nice to have it working again ! 
