Question about 2003 Mercury Grand Marquis

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2004 grand marquis headlights won't come on automatically or manually. sometimes they come on - sometimes not. putting them on high beams does not help. however - I can HOLD the high beam switch forward and the high-beams are on as long as I hold it. sometimes they do come on. just no rhyme or reason - cannot think of what triggers them to come on. also, my key is burning hot sometimes when i take it out of ignition. are the two problems connected? thanks in advance, Eloise

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  • john dittus Aug 20, 2008

    Head lights do not come on, but I have the ability to use highbeam by using my passing control

  • Serena1270 Aug 30, 2008

    I have the same problem. I have changed headlights and checked fuses as well as purchased a chilton's repair manual. I have no resolution to this problem and I am desperate for answers.

  • pistonluck Jan 03, 2009

    I also have a similar problem with my 2003 Grand Marquis and replaced the the switch assmebly (on the dashboard) and did NOT resolve the problem.



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Just had my 2004 Grand Marquis HL fixed. They would go off after less then 5 mins and then come back on in less than 5 mins. Then repeat. ONLY The high beam Hold switch would work. It was the LCM (Light Control Module) found behind the Glove Box. $700 for the Dealer to fix.
15 Min job for anyone who can figure out
how to remove the Module.

Posted on Sep 16, 2010

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I have 2004 grand marquis where the air condintion work in my car but it will not switch over to heat

Posted on Oct 04, 2010

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I have the same problem on my 2005 grand marquis try to tap or kick the lcm its is a little black box the makes the noise when you turn on your signal lights or have the drivers door open...and your lights should come on for at least 20 to 30 min then after that you have to wait like 10min to turn lights back on.try it trust me i have to do it all the time but i have to hit really hard with a bat lol because mine has been not workin properly for about 6 months now and its expensive to fix so do it the ghetto way

Posted on Feb 01, 2010

  • Jay L
    Jay L Mar 31, 2014

    So Just Basically change your light control module


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I know it's a completely different make, but on my Audi (and on a few other cars that I've seen), that is a symptom of a failed headlight switch. You may simply need to replace it with a new one (or one from a salvage yard). They're usually not terribly expensive nor all that difficult to install, and if you have some basic tools and a little mechanical know-how you'll probably be able to swap it in your driveway without much trouble at all.

I can't promise that Mercury is the same as the other cars I've seen like this, but many cars that I've seen (from German to American to Japanese) all end up needing a new light switch when this kind of problem happens.

Posted on Aug 30, 2008

  • Jeremy Dellow
    Jeremy Dellow Aug 30, 2008

    I just saw another post by a different user who solved this problem with a new switch assembly (aka "light control module"). Looks like that did turn out to be the problem.


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