Having a problem with my rear passenger window. I tried to roll the window down so my dog could have some fresh air, and it didn't work. The switch in drivers door doesn't do anything for the rear passenger window. So I reach back and unrolled the window with the switch on the door, it went down but wont come back up. Tested the connections and it has 12 volts. Tried both switches and the show a draw, from both the drivers door switch and the rear passenger switch. How do I replace the motor? That's what I think the problem is .