Its a bulkhead wire.My car did it off and on for about 2 years.I cant remember what wire but I think it was a big brown or black one.I used to keep my door open and then listen for the key buzzer to go on then I knew I had the right wire.I would push it in .It turned out the plug end is broke so it was the whole plug was loose.Pull them 1 at a time a check for loose or coroded wires .