skorpion

I have a 2000 Toyota 4runner SR5. My rear wiper stopped working so I thought maybe the motor went bad, so I replaced it. DIDNT WORK. I thought next that it may be the relay that is on the tailgate, so I replaced it. DIDNT WORK. My rear window go down when I lift the tailgate. It seems to have a mind of its own. Someone mentioned that it might be a grounding problem. Any suggestions, I had to unplug the tailgate so my window didnt keep going down and I have no rear wiper. PLEASE HELP.