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.
Ou812
Look on the trunk lid support arm.
Check inside the trunk, on the lid arm.
thats my question to you
The detailed directions are in your owner's manual. It is quite simple to do.
There should be a sticker on the underside of the trunk lid - that's where it was on my 92 grand marquis
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
The moduule is inside the drivers door, located at the front and near the bottom of the door itself.
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
1st step check fuses