Many Ford trucks, vans and suvs use PATs (passive
anti-theft) keys. These keys prevent someone from copying your key to a
blank and using the blank. There is a small chip in the key which the
vehicle must recognize before it will start.
PATS is Ford Motor
Company's passive anti theft system. In 1996 it started showing up on
select models of Ford and Lincoln Mercury vehicles. The keys for these
vehicles have a tiny radio frequency transponder imbedded in the plastic
When you attempt to start the vehicle, the
onboard computer sends out a RF signal that is picked up by the
transponder in the key. The transponder then returns a unique RF signal
to the vehicle's computer, giving it the ok for the vehicle to start and
continue to run. This all happens in less than a second, and is
completely transparent to the vehicle operator. It is a very effective
system that does its job without the vehicle owner having to think about
it, or modify his / her usual routine.
The PATs key is used on
the following Ford family trucks and SUVS:
1998-up Mercury Mountaineer
PATs can be found on the follow Ford family cars and
1997-up Crown Victoria
Mustang and Taurus
1998-up 2000-up Lincoln LS
Lincoln Mark VIII, Lincoln Continental and Lincoln Town Car
Mercury Grand Marquis
1998-up Mercury Mystique
Following are the instructions for programming a blank key
(you must have at least one working key for this procedure).
1. Make sure you have both keys.
2. Turn on car but don't
start. Watch "theft" indicator untils it goes out.
3. Turn off and
repeat procedure with second key.
4. After "theft light goes out,
insert new key and turn on.
5. Wait until the theft indicator goes
off and then turn off switch.
6. Wait thirty seconds. New key is now
programmed into security module. Repeat for any other keys.
Erase any old codes by entering the factory code.(buttons will light
2. Press 1/2 button within 5 seconds.
3. Press 7/8 and 9/0
buttons at the same time within 5 seconds. To set new
1. Enter factory code (numbers will light up)
Press 1/2 button within 5 seconds.
3. Enter personal 5 digit
code(decide beforehand) within 5 seconds of each previous one.
unlock all the doors,press the 3/4 button within 5 seconds of the driver
To lock all doors and set alarm system,press 7/8 and
9/0 at the same time.
To disarm or reset a triggered alarm,just
enter personal or factory code.
Do not set a code with five of
the same consecutive numbers. It's too easy for thieves to figure out.Deactivating
and Activating Autolock
To deactivate the "autolock":
all doors and tailgate closed but NOT locked,and ignition OFF.
Enter 5 digit code
2. While holding 7/8 button in, press and release
the 3/4 button.
3. Release 7/8 button
The horn will chirp once if
the "autolock" was deactivated
or two times if "autolock" was
To reactivate the system,repeat steps 1 thru 3Alternate
Method To Deactivate And Activate Autolock
Do steps 
through  (below) within 30 seconds or you'll have to do it over. If
you have to do it over, wait 30 seconds between attempts.
1.Turn the ignition key to ON.
2.Press the power door UNLOCK control THREE times.
the ignition key from ON to OFF.
4.Press the power door UNLOCK
control THREE times.
5.Turn the ignition key back to ON .The
doors should lock and unlock.
6.Press the power door UNLOCK
control. The horn should chirp ONCE to confirm successful switching of
the autolock system.
Hope this help you (remember comment and rates this).