Hey so im a new 4runner owner and although i am super excited about it, it does need a few things taken care of. One of witch is that my back window will not role up. I guess that it thinks that the back windshild wiper is down and so it wont go up. if i role it down its stuck until it decieds to work. any idea how easy this is to fix? Or if its not something i can do how much it would cost?