Question about 2004 Mercury Grand Marquis

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2004 mer. grand marquis

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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  • fastandgo Oct 25, 2008

    when you pull back on the turn signal indicator both the hi and low beams are on.  looking in the owner's manual there is nothing listed as a "lighting relay".

  • Jim X Jan 10, 2009

    I have the same exact problem but to clarify the previous description both the high or low beams will cut out. Pulling back on the directional signal does consistently turn on the high beams as this bypasses the relay or connection that is intermittent.



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Ok i am going to assume by "holding the turn sinal back" that means the high beams are on. Now i believe that the grand marquis has 1 lo beam and 1 hi beam relay if they are rated at the same amperage you can swap em . The mercury i have has two locations under the hood and under the steering column to the left. In the car it is has a locking tab that you have to pull down to unlock it and it will swing out. In all honesty if you have 20 bucks and want to invest it i would suggest buying an repair guide either way good luck.

Posted on Oct 25, 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 new warranty called "Customer Satisfaction Program 14N01".

Posted on Aug 18, 2015


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Oct 01, 2012 | 2004 Mercury Grand Marquis

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Mar 06, 2017 | 2004 Mercury Grand Marquis

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I have a 2004 mercury grand marquis and the head lights intermitently will go out while driving at night. after a few minutes they will come back on. the car does have the auto position on the switch.

what you are experiencing is the head light switch itself is getting hot and the internal relays in the switch are seprateing you just need to change the switch also check the manual dimmer swicth under the column for sticking or malfunctioning

Jan 21, 2010 | 2004 Mercury Grand Marquis

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I have a 93 Mercury Grand Marquis and the headlights randomly turn off and on, does anyone know how to solve this?

There are 3 components for the headlights in your dash. The headlight switch, the delay switch, and the autolamp light sensor. If you have the lights manually turned on, without the autolamp position on the switch being on, then the headlight switch is a simple off-on switch.
If the headlight switch is manually on and the lights are cutting out the problem is either the fusible links or bad contacts in the light switch.
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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...

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15 Min job for anyone who can figure out
how to remove the Module.

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