Chrysler Repair: High Beams Coming on by theirselves on Chrylser Town & Country, high beams, low beams

Question
My wife has a 2000 Chrysler Town & Country.  The High Beams came on today by theirselves in the garage.  The car was off & the headlights switch was set to automatic.  I turned the switch from auto to off and the highbeams remained on.  I started the car and switched from highbeams to low beams and back, etc., but the high beams remained on.  I checked the high beam fuses and they were fine.  I ended up removing the fuses just to turn the lights off.  What would cause this?

Answer
Hi Brad,
Instead of the headlamp switch directly controlling the current to the headlamps the ciruit is controlled by a relay which actually turns on and off the current to the fuses and the lamps, and the headlamp switch, dimmer switch, and body controller controls the relay and tells it when to close or open. Your high beam relay is most likely stuck in the closed position and so it won't open the circuit and thus won't cut off the current. I suppose there is some scenario where it could be the headlamp dimmer switch or the body control module, but this is so obvious an explanation and it is the least expensive item to replace that I would go with this theory unless you have a volt-ohmmeter and some inclination to do some circuit troubleshooting to verify my theory or look for another explanation.
You will find the high beam relay in the power distribution center, under the hood. It is a long narrow box just outboard of the battery on the driver's side of the engine compartment. Look for a schematic label on the box cover or its underside or the circuit board to point you to exactly which is the high beam relay among the half a dozen square boxes plugged in. One of those is the high beam headlamp relay. Pull it directly out if its socket and plug in a replacement.  
But if you want to test my theory before you buy a new relay you could put the fuses back in so the high beams again are stuck on. Then pull the relay (the high beams will go out) but then reinsert the relay and as you do listen/feel for whether there is a click from inside the relay when you insert it. If you hear/feel nothing, and nonetheless the high beams still come back on and won't shut off that would be proof that the relay is stuck closed.
Roland