I have a 2000 Jetta, I think my computer is out. had a dead battery and got a jump. Now the trunk continually opens, no power to windows, mirrors, sunroof. I have raced the clicking noise to under the dash by steering column to a black box with 2 major connector plugs feeding into this box. I guessing this is a computer ( convenience system control unit ). Any ideas of what I should do? New, used, diagnose and how? help!