Mercury Grand Marquis
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How do you reset the keyless entry system on 1997 grand marquis?

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Look on the trunk lid support arm.

There should be a sticker on the underside of the trunk lid - that's where it was on my 92 grand marquis

The detailed directions are in your owner's manual. It is quite simple to do.

You cannot reprogram it. A dealer can get you the Master Code if you've lost it.

the code is in the trunk right by the hinge on the left hand side

Mine was under the trunk lid. When you open the trunk you can see it up underneath towards the back. A white sticker with 5 black numbers on it. '94 Grand Marquis

On my 98 grand marquis its on the passenger side trunk hinge !

The moduule is inside the drivers door, located at the front and near the bottom of the door itself.

The keyless entry system must be programmed with an OBD II tool which the dealer or locksmith has. Sorry that this is not the answer your looking for, I didn't want to hear it either.

The dealer should have that information. Also it may be in the owners manual. If you don't have one, try MOTORLIT.COM


The default location is on the Trunk Riser inside of the trunk on the left or right side. Look for a sticker.

Usually on one of the Trunk Lift Rods. If you can't find it, a dealer can look up the Master Code for you.

To reset the keyless entry code, you need to first enter the factory programmed code. Once entered, press the '1-2' button within five seconds of entering the last digit. You can then reset the code to your own. You will need to be extremely quick.

On the 1999, it's on the trunk hinge on the passenger side. Open the trunk and take a look. It'll be the easiest place to check without removing anything.

Open the keyless remote and you will see the battery take it out and replace it with the same size.

I had the same problem. Google "keyless entry remote 2003 Jeep Grand Cherokee".