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Ford Crown Victoria/Mercury Grand Marquis: Keyless Entry



  • I'm not sure, but it starts strong, no other electrical problems. I got the car from my dad, who bought it very used, he said it never worked for him either. I'm assuming all I got to do is enter the code, then press whichever button to unlock/open trunk, whichever right?
    My guess is at some time in the past someone has changed the module that holds the code.. I guess I will have to find a mechanic friend somewhere that can check it.
    Unless you guys have any other ideas.
  • I've got a question for my next door neighbor. They have a 94 Grand Marquis and their keypad is starting to wear out. If I find a new one on Ebay or somewhere is it as simple as replacing the keypad or is there more to it like resetting the computer or such. I didn't know if the keycode was stored in the keypad or in the car computer.

    Any ideas??? Thanks!!!
  • dan109dan109 Posts: 1
    In the middle of the night the lights come on and drain the battery without any input. Has anyone seen a similar problem? Seems to be more prevelant when it has rained.
  • we bought a 2006 without keyless entry or door pad. I have a few questions does anyone know if the wiring harness would have the plugs for the keyless entry even if it doesn' t have it? also if we get an after market keyless entry, like a viper can we hook up a doorpad to it?
  • sorry 2006 mercury grand marquis gs
  • My MGM has this problem. I had to go to manual on/off for the headlights and forget about the auto on/off. After doing that, I don't have this problem anymore. It must be something related to a sensor or the keypad as my keyless entry keypad doesn't work anymore either.
  • The unlock number is also under the hood but I don't know exactly where. If you can find it, that will save
    $25 and you'd hate to pay them to look under the hood! I just bought my dad's 99 MGM with 50K miles and it needed $500 repair to replace a part to operate the heating system door; the labor was high due to removing the entire dash. Now, I have my unlock code but the keypad is inoperative, won't light up or unlock the door.
  • Look on right side hood hinge, should be a small white sticker with the code.
  • medicleomedicleo Posts: 2
    I bought the "secret" on eBay - dismantled the driver's door only to find that on my 2007 GM the door code is no longer printed on the part number label on the model, which on the 2007 GM is in the lower front edge of the driver's door. There were no other labels in any of the other reported places like hood hinge, trunk etc although these may have been removed as mine was a former rental vehicle.

    My local Ford dealer wanted $55 to plug in their computer and read the code.

    I have determined that the code is a five-digit number, that is fixed by module, and IS NOT a default number like 12345 on every module. (Logic says that would mean that anyone who knows the default code could open every vehicle without keys) You need the fixed primary code to be able to enter or delete secondary user entered codes.

    Pressing 7/8 and 9/0 simaltaneously will lock all doors and test that the keypad is working.
  • silvereyesilvereye Posts: 2
    Did you get this fixed, how? My dome- lightand keypad light up by themselves with just a slight noise next to the car, it must be shorting to a pad, and the pad does not always wotk either....I found some on e-bay but want the right part number for my 99 MGM.

  • I have a 1998 Grand Marquis. When I first go to start my car after it's been sitting over night it starts right up. I'll drive for a few miles then park and turn off the car. When I come back 20 minutes later I'll turn the key and the battery will kick in but when I turn it further there is nothing. The engine doesn't turn over at all. What I usually do is open the hood to "cool" the engine more quickly. I'll get out of the car and lock it via the key pad. I'll wait a few minutes then enter the car via the keypad. When I try again it kicks in and starts normally.

    The only thing I can think of is in the past I couldn't get my key fob to work. A dealership said they key pad module wasn't good and that's why they couldn't get the key fob to work.

    Is there a chip in the key that communicates with the key pad module? If that communication is broken the care won't start? Has anyone heard of that before? I can't think of anything else that would cause my no start behavior. Thanks in advance for you help!
  • sure, the key has a chip in it, but unless the key is getting hot, if it works once , then again later, it is not the program in the key....Check your brake lights when the car wont start..if they are not working your safety interlock multi-contact switch in the steering column could be the started acting intermittant on me and all sorts of goofy stuff happened...If you have a check engine lite on you should get someone with a reader to get the code number ,,usually a used car dealer will have a hand-held unit for fixing the stuff on thier own lot, but they wont try to soak you like a dealer would....Remember, the weather is starting to turn, and batteries get old before you know it, if the car has good compression, and gets warm then a weak battery may not turn it over until it cools, check your battery terminals, clean them with baking soda and water, then after you re-assemble them, cover them with a light..(very light) coat of oil. also check the battery acid level, only use distilled water to top the up, as even maintainence free batteries sometimes get low on liquid, especially after this dry summer... Good luck
  • gobiggobig Posts: 6
    Thanks for the tips. I don't have a check engine lite. I'll check the break lights and the battery. Thanks for the help! I appreciate it!
  • I just bought a 96 Marquis LS and It was in the owners manual a white card with the code on it. and there's a way to change to your favorite in the manual.

    mine was easy plug number and open car.

  • I found my code in the trunk of my 1998 Crown Vic. It was on the support arm.
  • herbh1herbh1 Posts: 2
    How can I get the cover off or otherwise get in to the dome light bulb? I wonder why Ford leaves this out of the manual.
  • cyberwizcyberwiz Posts: 7
    I realize this is a very old post but I'm the OP I was browsing through my old posts and I realized that I never replied to harmar2. No guarantee that anyone who read this thread is still around after all this time but it might help someone out to know that the Security Module in a 2000 Grand Marquis was located under the drivers side interior door skin. I found it quite by accident during some later work on the car and forgot that I had even asked the question.
  • mgmownermgmowner Posts: 1
    Not sure if this will work for the older model, but after you enter the code you hit 3/4 to unlock the doors or 5/6 to open the trunk
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