Ford Mercury Villager 1997 Owner's Manual page 120

ID Code Programming Procedure
NOTE: All transmitters must be programmed (or
reprogrammed) at the same time. If the programming
mode is entered and the transmitters are not programmed
(or reprogrammed) at the same time, they will not
operate with the system.
1. Enter vehicle and close and lock all doors.
2. Insert and remove key from ignition six times within ten (10)
seconds. The instrument panel lights will flash twice.
3. Turn ignition key to the ACC position.
4. Press the LOCK button on the remote transmitter once.
5. To enter additional remote controllers (including the original),
unlock, then lock the driver door using the power door lock
switch.
6. Press the LOCK button on a new remote transmitter. The
instrument panel lights will flash twice, indicating code is
entered.
7. Repeat steps 5 and 6 as needed (up to four remote transmitters
may be programmed).
Anti-Theft System (If equipped)
This system helps protect your vehicle against break-ins or theft
by monitoring all doors, the hood and the liftgate lock
cylinder.
When an unauthorized entry occurs, the system triggers and will:
flash the headlamps and hazard lamps
honk the horn
disable the starting circuit to prevent the vehicle from being
started
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