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Everything you wanted to know about PATS.

Discussion in 'Under the Hood' started by fixxxer, January 22, 2009.

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    1. fixxxer

      fixxxer Well-Known Member

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      Antitheft and Alarm Systems: Description and Operation
      ANTI-THEFT
      The passive anti-theft system (PATS) uses radio frequency identification technology
      to deter a driveaway theft. Passive means that it does not require any activity from
      the user.

      The PATS uses a specially encoded ignition key. Each encoded ignition key contains a
      permanently installed electronic device called a transponder. Each transponder
      contains a unique electronic identification code, with over 72 million billion
      combinations.

      Each encoded ignition key must be programmed into the vehicle powertrain control
      module (PCM) before it can be used to start the engine. There are special diagnostic
      procedures that must be carried out if new encoded ignition keys are to be
      configured.

      The encoded key is larger than a traditional ignition key. The key does not require
      batteries and should last the life of the vehicle.

      The transceiver module communicates with the encoded ignition key. This module is
      located behind the steering column shroud and contains an antenna connected to a
      small electronic module. During each vehicle start sequence, the transceiver module
      reads the encoded ignition key identification code and sends the data to the PCM.
      The control functions are contained in the PCM. This module carries out all of the
      PATS functions such as receiving the identification code from the encoded ignition
      key and controlling engine enable. The PCM initiates the key interrogation sequence
      when the vehicle ignition switch is turned to ON or START.

      The PATS function uses the PCM to enable or disable the engine. All elements of PATS
      must be functional before the engine is allowed to start. If any of the components
      are not working correctly, the vehicle will not start.

      PATS uses a visual theft indicator located on top of the instrument panel. This
      indicator will prove out for three seconds when the ignition switch is turned to ON
      or START under normal operation. If there is a PATS problem, this indicator will
      either flash rapidly or glow steadily (for more than three seconds) when the ignition
      switch is turned to ON or START. PATS also "flashes" the theft indicator every two
      seconds at ignition OFF to act as a visual theft deterrent.

      The PATS is not compatible with aftermarket remote start systems, which allow the
      vehicle to be started from outside the vehicle. These systems may reduce the vehicle
      security level, and also may cause no-start issues. Remote start systems must be
      removed before investigation of PATS-related no-start issues.

      The PATs key is used on the following Ford family trucks and suvs:

      FORD: 1996-2001 MUSTANG, TAURUS
      1998-2000 CONTOUR
      1998-2001 CROWN VICTORIA
      2000-2001 FOCUS
      2002 THUNDERBIRD
      1997-2001 EXPEDITION
      1998-2002 EXPLORER
      1999 F-250 LD
      1999-2001 F-150, RANGER, WINDSTAR
      2000-2001 EXCURSION
      2001 ESCAPE
      LINCOLN: 1997-1998 MARK VIII
      1998-2001 CONTINENTAL, TOWN CAR
      2000-2001 LS
      1998-2001 NAVIGATOR
      2002 BLACKWOOD
      MERCURY: 1996-2001 SABLE
      1998-2000 MYSTIQUE
      1998-2001 GRAND MARQUIS
      1999-2001 COUGAR
      1998-2002 MOUNTAINEER

      Additionally, PATs can be found on the follow Ford family cars and mini-vans:

      1998-up Contour
      1997-up Crown Victoria
      1999-up Escort
      2000-up Focus
      1996-up Mustang and Taurus
      1998-up Windstar
      1998-up 2000-up Lincoln LS
      1998-up Lincoln Mark VIII, Lincoln Continental and Lincoln Town Car
      1997-up Mercury Grand Marquis
      1998-up Mercury Mystique
      1996-up Mercury Sable

      Following are the instructions for programming a blank key (you must have at least one working key for this procedure).

      The PAT

      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.


      1. Erase any old codes by entering the factory code.(buttons will light up)
      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 code:

      1. Enter factory code (numbers will light up)
      2. Press 1/2 button within 5 seconds.
      3. Enter personal 5 digit code(decide beforehand) within 5 seconds of each previous one.
      To unlock all the doors,press the 3/4 button within 5 seconds of the driver door unlocking.
      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":
      With all doors and tailgate closed but NOT locked,and ignition OFF.
      1. 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 activated.

      To reactivate the system,repeat steps 1 thru 3

      Alternate Method To Deactivate And Activate Autolock

      Do steps [1] through [5] (below) within 30 seconds or you'll have to do it over. If you have to do it over, wait 30 seconds between attempts.
      Close all doors securely.

      1.Turn the ignition key to ON.

      2.Press the power door UNLOCK control THREE times.

      3.Turn 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

      Troubleshooting:

      The engine does not start and LED remains off.
      1. Check PATS system fuses
      2. If alarm is fitted check if LED functions for alarm: if not check cigar lighter fuse (also used for LED)
      3. If not go to main dealer

      Engine does not start: LED flashes rapidly Leave ignition on until the LED starts to flash a 2 digit code: (sequence- pause-sequence)
      Check the following codes:
      Code flashes:
      1:3 Key code not received. Is key screened by other keys or objects? Try different key: if okay then first key is faulty. If not go to main dealer
      1:4 Partial code only received. Try again. If not okay use different key. If not go to main dealer
      1:5 Key not programmed into PATS. Program key as above using master
      1:6 Faulty link between PATS module and EECV Go to dealer .
      For more information and troubleshooting tips:
      PATS-Troubleshooting-DIAGNOSTIC-Service-Tips and:
      Programming Ford-PATS
       
      Last edited by a moderator: September 7, 2013
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    3. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    4. fixxxer

      fixxxer Well-Known Member

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      Thanks Brooklyn for moving this, I wasn't quite sure where it would be best to post it. I just want to give back a little for all the great information I've found here.
       
    5. Blee1099

      Blee1099 Evil Asian Moderator Emeritus EF Vendor

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    6. Datsun280

      Datsun280 New Member

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      Im going to try this on my Explorer tomorrow but im 90% sure this is false. For the later Explorers you need 2 working, programmed keys to self program a key, not just one. This is according to my local dealer and it is also stated in the attached link at the end of the original post.

      Correct me if im wrong here..............
       
    7. Datsun280

      Datsun280 New Member

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      Just tried this, you need two working keys to do this with my year Explorer at least.
       
    8. TheJackal

      TheJackal Well-Known Member

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      2 working keys are the typical requirement. I don't know of any system that allows additional key programming with just one key, as someone who is using the car temporarily (say, a mechanic or so) could link an additional key to the system without the owner knowing.

      The wiring from the PATS module to the GEM is as follows:
      BLACK/YELLOW--RF Ground
      DARK GREEN/WHITE--RF Power
      GRAY/ORANGE--Receive
      WHITE/LIGHT GREEN--Transmit

      This information is useful if you're trying to install a remote start system and need to wire in a bypass module. I bought a bypass module that came with some p¡ss-poor instructions and struggled with this for days. Turns out the module was defective. :confused: Had I known all this ahead of time, I wouldn't have wasted hours trying to switch everything around and making a real mess.

      If you're not installing a remote start bypass, then there's really no reason to cut these wires, unless you seriously know what you're doing. Remember, your Explorer won't start unless the PATS system is fully operational, and there is no bypass.
       
      Last edited: February 10, 2009
    9. inh

      inh Elite Explorer

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      Whats the cheapest way to get a second key programmed?
       
    10. techieman33

      techieman33 Explorer Addict

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      Buy a key on ebay, take it to walmart, they'll cut it for free, and find a locksmith that can program it.
       
    11. CDW6212R

      CDW6212R Elite Explorer

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      Generally for a PATS vehicle you must have two other programmed PATS keys to be able to add more. This applies if there are two or more key codes in the PATS memory. If there happen to only be one code in PATS memory, then you only need that one key. If the PATS memory was empty, then you can use any PATS key. Therefore it can't hurt to try to add a key with what you have, it just isn't likely that less than two keys are in PATS memory.

      The PATS can accept a total of eight key codes.

      If you have less than two PATS accepted keys, the only way to add more is to remove all key codes from the PATS, and start adding them again. That code erase procedure can only be done by a special Ford diagnostic tool, at the dealer. After they remove the codes, the PATS module will accept any keys with the simple procedure. It will accept the first key without any requirement. Then it will accept the 2nd PATS key only after the 1st is applied in the ignition. After that you have to have two programmed PATS keys again like normal.
       
    12. inh

      inh Elite Explorer

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      How much would the dealer charge to erase the PATS memory?
       
    13. CDW6212R

      CDW6212R Elite Explorer

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      I'm not sure but it should be well under $100. The procedure is automatic once started, and takes ten minutes. I had mine done by a friend tech, it didn't work the first time, so total was about 30 minutes for my 99 truck.
       
    14. zp18zp18

      zp18zp18 New Member

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      I have one working key(A) and another new key(B) that has been cut already and will open the doors and unlock the ignition but will not start the car.


      1. Make sure you have both keys.(A&B)
      2. Turn on car (B) but don't start. Watch "theft" indicator untils it goes out.
      3. Turn off and repeat procedure with second key(A).
      4. After "theft light goes out, insert new key and turn on. (B)
      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.

      Is this it?
      TIA, GWB
       
    15. CDW6212R

      CDW6212R Elite Explorer

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      No, that will only work if the PATS module happened to only have one key in total programmed into it. How rare is that, all vehicles have two or more keys programmed into them.

      Try it, it will do no harm. But expect it to not work, and plan to go to Ford to have the PATS memory cleared and the new keys programmed in. Welcome,
       
    16. zp18zp18

      zp18zp18 New Member

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      I was just trying to get the sequence down, I wasn't sure which key and when to use the original and the new. I bought 3 keys on ebay and will try one when I get them. It looks like I will need to get one programmed at the ford house and then I can program the other two myself.
      Incidentally: PATS uses a visual theft indicator located on top of the instrument panel. Where is this indicator? I have the Theft light that flashes when I turn the key on, the air bag indicator, Over drive along the bottom of the cluster but I cannot locate another. The writeup distinctly says there is a visual theft indicator in addition the the Theft light at the bottom.

      Thanks
       
    17. CDW6212R

      CDW6212R Elite Explorer

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      I don't recall reading of another indicator. The PATS is a feature of all 98 and newer Fords as far as I know. The "THEFT" light is connected with the PATS and any OEM alarm.
       
    18. zp18zp18

      zp18zp18 New Member

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      Sorry, I was alluding to the original posters comment: PATS uses a visual theft indicator located on top of the instrument panel. This
      indicator will prove out for three seconds when the ignition switch is turned to ON
      or START under normal operation. If there is a PATS problem, this indicator will
      either flash rapidly or glow steadily (for more than three seconds) when the ignition
      switch is turned to ON or START. PATS also "flashes" the theft indicator every two
      seconds at ignition OFF to act as a visual theft deterrent.


      I have the Theft indicator that flashes, but not "the visual theft indicator located at the top of the instrument panel" Mine is a 99, maybe his reference is to a newer model.
       
    19. CDW6212R

      CDW6212R Elite Explorer

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      I think that is the same thing, a different(not very good) description of the "THEFT" light.
       
    20. Toucan

      Toucan Active Member

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      1st and second key refers to already programmed keys??
      At No.5 Do you take out key or leave it in and wait for No.6 to happen?
       
    21. Jeffbethandkidz

      Jeffbethandkidz Active Member

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      You must have atleast 2 keys stored in the PATS memory inorder to program any keys without diagnostic equipment.

      If you have 2 keys programmed and wish to program more (up to 8 total) then insert the first programmed key, turn to on (do not crank) for 5 seconds, then turn off and remove. Within 10 seconds, insert the second programmed key and turn to on (do not crank) for 5 seconds, then turn off and remove. Within 10 seconds, insert the unprogrammed key and turn to on for 5 seconds, then turn off. Repeat for any additional keys you wish to program. Verify all keys work.

      If you only have one working key, you must have diagnostic equipment to program anymore keys. Most dealerships will charge appx .5 to 1.0 hour at the shop rate to program keys. If you are near me, look me up and I will do it for free.
       
    22. Toucan

      Toucan Active Member

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      Thanks, No, I am all the way in Belize, in Central America. I have both my orignal keys but it is always good to know.
      Cheers
       
    23. dkchrist

      dkchrist Well-Known Member

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      Great info.

      Now I should be getting another key....
       
    24. Toucan

      Toucan Active Member

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      Yes info here is great. I recall before the internet one had to go down to a techinical library if one wanted to know something. Mechanics those days would never share knowledge. Wonderful World, Wonderful Feeling:cool:
       
    25. willy2

      willy2 Member

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      Just a little more detailed post on the codes is here:
      http://www.explorerforum.com/forums/showpost.php?p=2077855&postcount=3
       
    26. shawn wolfe

      shawn wolfe New Member

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      just an FYI

      In houston, tx ford dealers charge $30 for a key and $100 to program the key.

      I am going to try and see what a locksmith will program the key for on monday

      I find this is such a ripoff
       

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