Question about 2004 Mercury Grand Marquis

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I PUT A NEW LCM IN MY 2004 GRAND MARQUIS NOW IT WONT START BECAUSE OF THE PATS SYSTEM ANYONE HAVE ANY IDEA AS TO WHAT WENT WRONG?

CAR STARTED JUST FINE UNTIL NEW LCM WAS INSTALLED,PICKED CAR UP FROM DEALER AND NOW I HAVE TROUBLE STARTING IT.THE RED SECURITY LIGHT FLASHES RAPIDLY AND IF I KEEP TRYING TO START THE CAR THEN AFTER SEVERAL ATTEMPTS IT MIGHT START.I HAD NO PROBLEM WHAT SO EVER UNTIL NEW MODULE WAS INSTALLED.

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  • Contributor
  • 15 Answers

Don't know anything about this but, could your ignition key be coded to your old LCM?

Posted on May 15, 2014

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SOURCE: My 1987 Grand Marquis turns over but will not

is there spark dos it spin do you got test light.tack of cap is rotter
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shift lock not working need to overide

Posted on Dec 15, 2010

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SOURCE: 2005 MERCURY GRAND MARQUIS GS LCM headlights

you can oder a cheap lcm from silverstatefordparts.com or sometimes u can just tap the lcm box and lights should turn back on.

Posted on Jul 10, 2010

Thompsons196
  • 350 Answers

SOURCE: think the security system is

Try inserting the key to the on position wait over ten minutes then it should start, yes it has to do with the passlock security system

Posted on Jan 30, 2011

  • 5370 Answers

SOURCE: my moms 2001 Mercury Grand Marquis is dead. It

For tick tick noise under dash board the fuse box under the dash needs to be inspected.May be any relay in that fuse box is flickering or getting short and making this noise.So first check the fuse box under the dash.------------ And for no start problem, it indicates towards Antitheft problem.-------------- VEHICLES EQUIPPED WITH PASSIVE ANTI-THEFT SYSTEM (PATS) MAY NOT START OR CRANK.----------- This problem comes when your key is not detected by the ignition cylinder.There is a chip in the car key and reader in the ignition cylinder.When you insert the key in ignition switch, the reader in ignition cylinder reads the chip on the key and it detects that right key is inserted.ut if the wrong key is detected or no key is detected then it will not let the car to start.It seems like car is dead.------------ But this problem remains for 30 minutes.After 30 minutes you can again insert the key and see.If the key is not detected again then again you have to wait for next 30 minutes.------------ Actually the procedure is as follows.This PATS is a safety feature.This feature is there because no body can steal your car by inserting the wrong key.------If the ignition detects that wrong key is inserted or it cannot detect the key, then it goes into 30 minutes lock out system.Now till 30 minutes it will not let the car to start.Automatically after 30 minutes the ignition comes out of lock out.-------------- But as you said that suddenly car will not start , then suddenly it will start.If you notice this problem again n again then the problem relates to weak chip in the key or weak chip detector in the ignition cylinder.--------- This chip in key and signal detector in ignition can be tested and replaced by the dealer.The chip is available online, but in most of the cases it needs to be reprogrammed, then only new chip works.Now to get re-program you have to take the chip and car to dealer.--------- Also if you have another key then try with both keys to start.If the problem is with chip in the key then car should start with another key.But if problem is with chip detector in ignition cylinder then it will not start with any key.------------ In some cases disconnecting the negative terminal of the battery for 30 minutes then reconnecting the battery helped to solve this problem. Disconnecting the battery terminal and reconnecting the terminal after 30 minutes, resets the internal system of car.Sometimes all problems gets reset and problem resolves.So before you go for chip reprogramming and replacement to dealer, try this battery disconnecting and reconnecting reset procedure.------------- This will help.Thanks.Helpmech.

Posted on Jul 10, 2011

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1 Answer

After change battery car couldnt start and security light blinking continusly please help me


You will have to take to the dealer an have the PATS system reset , need factory scan tool to do it . PATS - passive anti-theft system .

Dec 01, 2015 | 2004 Mercury Grand Marquis

2 Answers

Head lights go off and on driving down the road at night.


Just went through this problem with my own 2004 grand marquis was the lighting control module under steering wheel under dash hard to get to but i replaced it myself part from auto zone

Aug 24, 2013 | 2004 Mercury Grand Marquis

1 Answer

Lcm 2004 grand marquis


the lcm is just right of the steering wheel column and left of and below the radio. you have to remove a plastic cowling under the steering column that is attached by two plastic push pins on either side of the column. the cowling slides out and the lcm is exposed. it's a black box a bit bigger than the size of a brick and has three wire harnesses plugged into it. the lcm is held in a metal cage bracket with two hex head screws. After removing the screws, the lcm can be pushed up slightly and out of the cage toward the front of the fire wall. it's easier to detach the harnesses after the lcm is out of the cage.

Nov 26, 2011 | Cars & Trucks

1 Answer

How do i replace the lcm on my 2004 grand marquis?


The lcm is just right of the steering wheel column and left of and below the radio. you have to remove a plastic cowling under the steering column that is attached by two plastic push pins on either side of the column. there is an accessory light that needs to be unplugged from the cowling. the cowling slides out and the lcm is exposed. it's a black box a bit bigger than the size of a brick and has three wire harnesses plugged into it. the lcm is held in a metal cage bracket with two hex head screws. After removing the screws, the lcm can be pushed up slightly and out of the cage toward the front of the fire wall. it's easier to detach the harnesses after the lcm is out of the cage.

Nov 26, 2011 | 2004 Mercury Grand Marquis

3 Answers

I have a 2004 Mercury Grand Marquis. The headlights randomly switch off, while the parking lights remain on. The fuses look good.


the headlight switch is most likely going bad, do you hear a clicking noise in headlight switch when they cut off by their self? if it was a fuse the parking lights would go out also. hope this helps!!

Sep 19, 2010 | 2004 Mercury Grand Marquis

4 Answers

Headlights come on for a 10 minutes and then turn off; dash lights, turn signal, passing signal all work etc.


There is actually a possible recall on this issue as it is a known problem with the LCM, or Lights Control Module. Go to the following site:
http://www.arfc.org/complaints/2003/mercury/grand_marquis/

This is one of the complaints:
HELLO, WE HAVE A 2003 MERCURY GRAND MARQUIS THAT HAS A PROBLEM WITH THE HEAD LIGHTS SHUTTING OFF AT RANDOM TIMES. NOTHING GAVE WARING TO THIS PROBLEM HAPPENING, WE BOUGHT THE CAR USED, AND WAS JUST FINE FOR A YEAR, THEN ALL OF A SUDDEN ONE DAY THE HEADLIGHTS JUST GO OUT. THE FIRST TIME IT HAPPENED WAS ABOUT 6 MONTHS AGO(3-1-10). NOW EVERYTIME IT IS DRIVEN WITH THE HEADLIGHTS ON, IT IS GUARANTEED TO HAPPEN AT LEAST ONCE AND SOMETIMES UP TO 5 TIMES JUST IN 3 MILES OF DRIVING ON MY WIFES WAY HOME FROM WORK. THE ONLY WAY TO GET THE LIGHTS BACK ON AFTER THEY GO OUT IS TO PULL OVER TO THE SIDE OF THE ROAD, SHUT THE CAR OFF, LET SIT FOR A FEW MIN, THEN START AND THEY WORK AGAIN FOR A BIT. THIS IS OVERALL VERY DANGEROUS AND SUPRISING THAT WE HAVE NOT BEEN IN AN ACCIDENT OR RECIEVED A TICKET YET! I AM A ACTIVE MEMBER ON A CROWN VICTORIA FORUM, AND WITH LITTLE SEACHING ON THAT SITE OR GOOGLE YOU WILL SEE TONS OF REPORTS OF THIS BEING A VERY COMMON PROBLEM ON THE 2003-2005 CROWN VICTORIA, GRAND MARQUIS, AND MERCURY MARAUDER. WITH THE HELP OF OTHER MEBERS ON THAT FORUM IT WAS FOUND TO BE A FAULTY LCM(LIGHTING CONTROL MODULE) WHICH HAS A PROBLEM WITH OVERHEATING LIGHTING RELAYS. THE ONLY WAY TO REMEDY THIS PROBLEM IS TO PURCHAS A NEW LCM FOR ANYWHERE BETWEEN $250 AND $600 WITH NO GUARANTEE HOW LONG THAT PART WILL LAST. I ACTUALLY PURCHASED A NEW ONE TODAY. VERY EXPENSIVE FIX JUST FOR THE USE OF HEADLIGHTS, BUT I VALUE MY FAMILIES SAFETY MORE. I WILL BE KEEPING MY OLD LCM TO POSSIBLY HAVE IT REPAIRED FOR WHEN MY NEW PART FAILS AGAIN. THANKS SO MUCH.

Aug 10, 2010 | 2003 Mercury Grand Marquis

2 Answers

Headlights work intermitently


HI,Inspect the #27 fuse holder of the Central Junction Box (CJB) for a questionable contact issue with the male spade of the fuse, which may cause intermittent loss of contact.if ok sounds like you need lcm= light control module.

Sep 30, 2009 | 2003 Mercury Grand Marquis

1 Answer

Lights on 2000 Mercury Grand marquis will suddenly go out while


please rate as solved if this fixes your issue. Let me know too.

I believe you have a bad LCM, Lighting Control Module. Or, the connectors to it have corrosion maybe. The module is above the brake pedal. It is very expensive. You can buy one at discount from tascafordparts.com. Sometimes, ebay has one too. But, you need one for your year car. Match the part number on your LCM.

Here's how to get it out.

SECTION 419-10: Multifunction Electronic Control Modules 2000 Crown Victoria/Grand Marquis Workshop Manual
REMOVAL AND INSTALLATION Module —Lighting Control (LCM) Removal
  1. sya~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Prior to removal of module, it is necessary to upload module configuration information to a scan tool. This information needs to be downloaded into the new module once installed. For additional information; refer to Section 418-01 . (I replaced one without doing any programming, so I don't think this applies).

  1. sya~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Electronic modules are sensitive to electrical charges. If exposed to these charges, damage may result.
    Disconnect the battery ground cable.
  1. Remove the LH instrument panel lower insulator.
    1. Remove the pin-type retainers.
    1. Disconnect the courtesy lamp.
    1. Remove the LH instrument panel insulator.
  1. Position the LCM aside.
    1. Remove the screws.
    1. Release the locking tab.
    1. Position the LCM aside.
  1. Remove the LCM.
    1. Disconnect the electrical connectors.
    1. Remove the LCM.

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Jun 03, 2009 | 2000 Mercury Grand Marquis

4 Answers

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...


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.

Aug 17, 2008 | 2003 Mercury Grand Marquis

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