I know this question is old, but just in case someone else is having the same issue, I would suggest checking the easiest fix first. Check to make sure that the rear wiper is seated correctly. It is worth taking a few minutes to mess around with it for a bit while trying the window. If the wiper blade is not sitting in its holder correctly, there is nothing you can do to make the window move! Try it. It might save you some time and money.