Did you buy this from a Ford or Mercury dealer? If so, they should provide
you the code for free. If you purchased it from a third party, then they
should have the code. It probably was on a card in the owner's guide folder.
Grand Maarquis of this vintage use a Driver Door Module (DDM) to control the
locks. This module is inside the drivers door. It is possible the code is on
a label on this module - or not. The shop manual does not say that it is
there. You have to remove the drivers door panel to take a look. Unlike
older remote entry control modules, this module is electroncially
programmable. A Ford dealer can connect scan equipment to the vehicle and
retrieve the permanent code. They won't do this for free if you did not
purchase the car from them.
Is the car still under warranty? If so, I might take it to a Ford dealer and
let them know the module does not work.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.