Question about 2003 Mercury Grand Marquis

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Headlights do not work

I have the same problem as two other users. My headlights will not work manually or automatically on my 2004 Mercury Grand Marquis, I have high beams by holding the high beams on manually while driving. I have checked all the fuses, purchased new headlights and they still do not work. Desperate for help!!!

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  • fastandgo Oct 25, 2008

    headlights will switch off by themselves.  happens when h/l switch is in auto or manual.  can get lights to work by holding turn signal back.  after varying amounts of time lights will work normally the cycle will repeat.  could this be a relay problem?  if so where is it located?


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It cost me just under $700.00 to have a dealership replace the headlight control module.

Posted on Nov 26, 2009

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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

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Usually it's a case of the regular headlights not working while the high beams (brights) still work if you hold them on while driving, but if you have a 1999-2011 Mercury Marquis, Mercury Marauder, or Crown Victoria, and your regular headlights and or tail lights don't work it probably is your LCM that used to cost around $1,000 to repair.

The good news now is that Ford just finally extended the warranty on your LCM (Lighting Control Module) for free - both parts and labor and will install a new one for free! Ford has extended the warranty to 15 years/250,000 miles. THIS IS NOT A RECALL! They do not advertise this.

Your regular headlights must not work properly in order to get a new LCM on this new extended warranty. It must be done at a Ford Dealer and the fix is free. Call your local Ford Dealer and tell them you need to make an appointment because your headlights don't work and that Ford has extended your warranty on the LCM.

They may act like they don't know what you are talking about, so tell them it is the Customer Satisfaction Program 14N01. Have your car's Vin number ready as they will ask for it. You don't have to be the original owner. If they still act like they don't know what you are talking about ask to talk to the manager or tell them to call Ford Motor Company and ask them, or you can call Ford yourself.

We had our 2003 Marquis done at a Ford dealer in August of 2014 in Scottsdale, AZ, but first they checked out our LCM first to make sure it didn't work. As soon as they found out it didn't work, they installed a new LCM for free under the about new extended warranty called "Customer Satisfaction Program 14N01".

Posted on Aug 18, 2015

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I have the same problem, but it only happens sometimes,and clears its self in one or two minutes of turning off automatic and using manual.

Posted on Nov 01, 2008

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I had a similar problem, but the lights would shut off and come back on later. Temperature is definitely a factor. Just had an ace mechanic tell me it was the Electronic Control Module. a $500 part.

The ac quit, he fixed the blower, but it only blows out of the defrost and floor. He's working on that one now.

Posted on Sep 23, 2008

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Since it is an easier fix, I would first check (or replace) the headlight relay. Many cars don't entrust switching the 8 or more amperes to a switch but use the switch only to control one more relays that only require tenths of amps to operate.
If you don't know where to look, you might consider buying an aftermarket service manual from Haynes or Chilton which you would find valuable in answering other questions in the future.

The relay may be located with numerous others and those are often in an enclosure with the fuses.
If they aren't identified by function, you may need the mentioned manual to find the right one.

Posted on Aug 30, 2008

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Headlight control module
email me for repair instructions ginolena@sbcglobal.net

Posted on Apr 20, 2009

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