The back window wont roll up?

I'm not to familiar with your vehicle but I use to work at a electric motor repair shop. Im sure you have a DC motor in it and it sounds like it's going bad. It could also be binding up on the rollers or fell off the tracks. But it sounds more like your motor. It could either be your brushes in it are all gone or your com is burnt up. I would replace it just to be safe. It should be easy to replace. It should have a connector that just unplugs. It should be in the door that the window isn't working. But shop around to find a good price because the dealer with screw you bad. Their will be a part number on the motor. But make sure it's not the rollers or anything before you go out buying a new one.

Theres a bluewire and tan wire switch them at the plug by back window and it will do oposite itll roll up not down i think its the switch in the dash with mine