Ford Mercury Villager 1997 Owner's Manual page 123

Disarming a triggered anti-theft system
The alarm can be disarmed by:
unlocking the driver or passenger doors
unlocking the doors with the remote keyless entry transmitter
(if equipped)
putting the key in the ignition and turning it to the ACC
position
NOTE: The flashing lights and honking horn will shut off
automatically within 2 minutes 30 seconds after the
system is triggered. It will trigger again if another
intrusion occurs. However, the starter circuit remains
disabled until the system is disarmed.
NOTE: Factory installed remote keyless entry systems will only
operate with the ignition in the OFF position.
Controls and Features
119