point behind each headlamps. On psngr it's very near those 3 connectors to the front side of the wheel well - use a flashlight and look for a black wire (lug) connected to a bolt screwing into the body of car. Similar location on driver's side too -- remove the bolts, clean with some sandpaper and alcohol and put back together.
PS - Could be other things as well but a grounding issue would be the first thing to check.