Had the same problem. I could wiggle the wiring harness just in front of the driver side rear door post (visible when front door is open) and the rear window would work intermittently. I unplugged the rubber grommet at the top of the harness and found that the electrical plug hidden there was not snapped together. I pushed it in until I heard it snap and my problem was solved. You may have to take the plastic trim off of the inside of the post to get to the back side of the plug if it will not snap together from the outside.