Everyone is saying it's above the headlights on the passenger side, gray in color plug with 2 wires. I've been looking for 3 weeks and unable to find it. My wife's 328is has one in the right location. Is there anyway to trace the wires if I can't find the plug? Dealership is charging me $78.00 just to find it!. I'll appreciate any help from anyone who can help. Thanks.