My 2003 Mercury Grand Marquis has the same problem. We found out it was the headlight module located under the dash above the gas pedal. The black box has wire connectors coming out of the back. Hitting the box worked for a little while, then I had to reach in the back and wiggle the wire harness. The dealership wants 500.00 to replace the unit. I consider Highway Robbery! They have installed a faulty piece of equipment on my Luxury car that could easily be life threatening but we know it won't be recalled until someone dies because of it. My husband was able to remove the unit and looked it over it had two circuit boards and he was unable to visibly see any problem or loose wire. He cleaned the connectors and used some electrical terminal grease on the wires, this improved it for a short time. The problem still exsists. I have sat for 30 minutes or more waiting for them to go through the On/Off cycle till they stay on for the 45 minute ride home from work. I have beat the box with my flashlight (maglights handle the abuse, my fingers and nails don't) till it came loose from the brackets that hold it. I leave my car running while pumping gas, short shopping trips and start it 20 or 30 minutes early before leaving for work. It is frustrating and dangerous. If this is the kind of quality in our American made cars it's no wonder they needed a BailOut! The only thing we have found to "fix" it is to find a used part that could possibly have the same problem shortly down the road or pay the theives at the dealership to replace it.
You headlight switch has a burned connector.
I have the same problem, I buy grand marquis 1995 from saudi company albayan aljadeed, fom 1999, but since 2009 the light problem come and they open under the driver wheel, It was dirty, greased wires, and this controller I find not original for ford. the car is old and I can't buy this for it . It is expensive. I will buy new car corolla.
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Scrapyard part is likely far cheaper than new and still a reliable replacement. Of the thousands like yours that are driving around with no problems they all have the same control unit. Likely you will have better luck with the replacement. I do agree that those and most other "modules" have no place in vehicles as they replace simpler more user friendly and reliable systems but aside from that, you also need yours working!!!
I had this problem with my 2003 Mercury Grand Marquis. Dealer wanted over $600 to replace the LCM (lighting control module). My mechanic said it might be something wrong with the security system, headlight panel switch of the turn signal control or LCM. Either way it was going to cost me hundreds. So I went online and found a guy in the San Fernando Valley here in sunny SoCA and he said it was probably the LCM... and he said he'd install a rebuilt one for free to check. Took him about one minute under the dash at the steering wheel to install the rebuilt one and solved the problem. Charged me $150 for the LCM and $25 to install it. He warn me the A/C and Heating module would probably go next, and is more expensive for him to fix. Here's his link.http://www.shop.modulerepairpro.com/ .
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