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My 2003 ford thunderbird pats will not let me start my car. The battery has been replaced. Recently and it will not let me crank the vehicle.... how do I reser the pats?

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Are you sure it's a PATS problem ? Does your vehicle have the little red light on top center of the dash panel ? Does it flash when trying to start the vehicle ? If so the dealer or a moblie lock smith that can do a key relearn .

Posted on Apr 16, 2017

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I'm having a starting problem which I believe is PATS security system related. engine cranks fine crank sensor is ok.


What make , model and year vehicle ? You mention PATS , that's ford , mercury , lincoln . Light flashing when cranking the vehicle ,anti-theft problem . Nothing you can do , unless you have a factory scan tool . Your best bet ,dealer . Disconnecting the battery isn't going to do anything . Need to have vehicle checked for DTC'S diagnostic trouble codes , do diagnostic's for the code . Replace or fix what ever the problem is . If a module needs to be replace , key's need to be programmed . Dealer or mobile lock smith that is licensed ! Don't know what your trying to say here OBD reading protocol OSD 9141 AND KEYWORD:2000 ,these have nothing to do with PATS -

Aug 26, 2017 | Cars & Trucks

1 Answer

2003 ford mustang gt anti theft light flashing engine will turn over but will not start


From my experience...
A non PATS coded key SHOULD not turn the STARTER...!

If ANTI-THEFT were invoked... you can attain a not start condition which the Owners Manual says must be cleared by the dealer.

A working PATS key should disable the anti theft... by turning the ignition on... ELSE try your other key.

The SecuriLock [PATS]
passive anti-theft system is not compatible with
non-Ford aftermarket remote start systems. Use of these systems may
result in vehicle starting problems and a loss of security protection.

Owners Guide (post-2002-fmt)
USA English (fus)

OWNERS MANUAL
Ford 2003 Mustang Owner Manual

SHOP MANUAL
Ford 2003 Mustang Workshop Manual

May 17, 2017 | Ford Cars & Trucks

1 Answer

How do I reset anti theft on2000 ford explorer


The passive vehicle protection system will be activated and will disable the vehicle from starting if there is a:
  • damaged encoded key.
  • unprogrammed key.
  • non-encoded key (key has no electronics).
  • wiring concern.
  • transceiver concern.
  • PCM concern.
  • module communications network concern.
Reset ? IF your anti-theft system light is flashing when trying to start your vehicle , an the engine doesn't crank , turn , or nothing happens when you turn key , then your anti theft system is at fault ! An trying to reset will not work ,you need to have it checked DTC'S - diagnostic trouble codes ,then fixed ! I suggest you have it towed to the dealer or a ASE certified repair shop !
PATS uses the powertrain control module (PCM) to enable or disable the engine. The PATS module communicates with the PCM over the SCP communication network in order to enable engine operation. The PATS module and the PCM use sophisticated messages in order to prevent a theft. The PATS and the PCM share security data when first installed together, making them a matched pair. After this security data sharing, these modules will not function in other vehicles. The PCM shared security ID is remembered even if the battery is disconnected. The PATS module also stores the vehicle's key identification code, even if the battery is disconnected. There are special diagnostic repair procedures outlined in this workshop manual that may be carried out if either the PATS module or the PCM needs replacement.

Jan 20, 2016 | Ford Cars & Trucks

1 Answer

My car thinks it is being stolen 2008 Ford Fusion anti theft has disabled ignition. Tried disconnecting the battery; remote entry with ikt; using key to unlock; hit panic button and turned it off with...


Hi Eileen , How do you know your having a anti-theft system problem ? Any lights flashing when you try to crank the vehicle ? The engine does not crank over ? If it is a anti-theft system problem ,disconnecting the battery is not going to do anything except lose some learned setting's in some control modules . There are a few thing's you can check but if none of these are the problem your going to have to have it towed to the dealer ! It'll need to be checked for DTC'S - diagnostic trouble codes !
PATS disables the vehicle from starting if there is:
  • a damaged PATS key.
  • a non-programmed PATS key.
  • a non-PATS key (key has no electronics).
  • damaged wiring.
  • a damaged transceiver.
  • a damaged instrument cluster.
Inspection and Verification
  1. Verify the customer concern.
  1. Visually inspect the following for obvious signs of mechanical or electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Large metallic objects, a second passive anti-theft system (PATS) key on the same key ring as the PATS key, or electronic devices on the key ring that can be used to purchase gasoline or similar items
  • Ignition lock cylinder
  • PATS key
  • Use of a non-PATS key or incorrect PATS key
  • More than one PATS key on key ring
  • Remote start system installed
  • Smart junction box (SJB) fuse(s):
    • 13 (7.5A)
    • 23 (7.5A)
    • 26 (7.5A)
  • Circuitry
  • PATS transceiver
  • Ignition switch
  • Instrument cluster
You may not know where some of these things are located !

Mar 22, 2015 | 2008 Ford Fusion

3 Answers

What does it mean when the ford PATS light is not flashing?


Try turning engine over with the head lights on, do the head or dash lights dim? Check earth straps, eg. battery to chassis, engine block to chassis, battery to engine block, (may not have battery to engine block), then check starter solenoid/relay and motor, then Check all power fuses, and fuse relays.

Oct 16, 2014 | 2003 Ford Focus

2 Answers

Car cranks but wont start after sitting 3 months


Sometimes if it set too long the gas went bad. You may have to drain the gas and the put fresh gas in.

Mar 01, 2014 | Ford Taurus Cars & Trucks

1 Answer

Ford Escape 2003 Have good battery charge but


New battery needed or a trickle charger when vehicle not being used

Jan 03, 2011 | 2003 Ford Escape

1 Answer

I need to change the battery on the 2003


it is in the trunk under the mat not to hard remove the mat take off the cables disconect hold strap replace the battery replace strap cables and mat just make shure you pot pos cable on pos and neg cable on neg

Dec 31, 2009 | 2003 Ford Thunderbird

1 Answer

2003 ford winstar only key broke in the ignition so i replace the the ignition and reprogramed brainbox however vehicle anti theft light keeps blinking when vehicle is on and off


the anti-theft light is supposed to blink when the car is locked to show the system is armed.

Does it flash while driving?

Principles of Operation
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 out of over 18 billion, billion combinations.
The passive anti-theft system (PATS), also known as SecuriLock ®, uses radio frequency identification technology to deter a driveaway theft. This system is known as Securilock® in North America, Safeguard® in the U.K., and PATS in Continental Europe. Passive means that it does not require any activity from the user.
The SecuriLock® System (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. If equipped the remote start system must be removed before investigation of PATS-related, no-start issues.
Each encoded ignition key must be programmed into the vehicle's powertrain electronic control (PCM) before it can be used to start the engine. There are special diagnostic repair procedures described in this section that must be carried out if a new encoded ignition key is necessary.
This system contains a new feature named Unlimited Key Mode. This feature allows a customer to program more than eight keys to the vehicle if they request it. Each vehicle in Unlimited Key Mode is set up with a special Unlimited Transponder Security Key. This allows all the customer vehicles to share the same keys, but no other keys from outside can be used to operate the vehicles. For an individual customer, any randomly selected Security Key is acceptable. Refer to Unlimited Key Mode Programming in Key Programming Switch State Control in this section.
The PATS transceiver module communicates with the encoded ignition key. The module is located behind the steering column shroud and contains an antenna connected to a small electronics module. During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and sends 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 the engine enable. The PCM initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.
All elements of the 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.
The PATS uses a visual theft indicator. The indicator will prove out for three seconds when the ignition switch is turned to RUN or START under normal operation. If there is a PATS concern, this indicator will either flash rapidly or glow steadily when the ignition switch is turned to RUN or START. The PATS system also flashes the theft indicator every two seconds at ignition OFF to act as a visual deterrent.
The following will activate the PATS and will disable the vehicle from starting:
  • incorrectly encoded ignition key
  • damaged encoded ignition key
  • unprogrammed key
  • non-encoded key (key has no electronics)
  • damaged wiring
  • damaged transceiver
  • damaged PCM

May 26, 2009 | 2003 Ford Windstar

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