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How to reset a anti thef system

How can I reset the anti theft system

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There is no way to reset the "Anti-Theft" system. Hopefully you have more than one ignition key. Slide one key into the ignition cylinder and try to start the engine. If nothing, try the same thing with the other key. There is a transponder inside each key and the exciter ring will send a signal to the key. If the signal that it receives is not valid, then the Anti-Theft system will tell the ECU not to allow the car to be started. What is the security light doing while you try to start the engine? Did this problem happen out of the blue? Was a repair performed on the ignition switch? Are there any other symptoms? Please write back and let me know, good luck.

Posted on Mar 25, 2014

  • Jay Parson
    Jay Parson Nov 13, 2015

    yes this problem happen out of the blue same ignition and key



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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: anti theft system is locked

With the drivers window down and all the doors closed and the hood open diconnect the battery. reach in and turn the key to run. Connect the battery without skipping around and the dash lights should come on. turn the key off and enter the car and start it as normal.

Posted on Dec 06, 2010

  • 57 Answers

SOURCE: where is the reset switch for the anti theft

you will have to go to your dealer for that information only dealerships can provide you with that information bring your year model and vin number and show proof of owner ship like titile they should be able to provide you with that bit of information.

Posted on Jan 29, 2010

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SOURCE: 1997 T100 Toyota anti theft

Welcome to Fixya

Turn the key to off position, then turn all the way to ON postion without starting the engine and let it sit like that for 10 min. This will reset the anti theft program in the cars computer. After 10 min turn the key to the off position and then try to start the car. Thank you for using Fixya!

If you need further help, reach me via phone at

Posted on Jan 29, 2011

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SOURCE: 1997 toyota 4runner anti theft system prevent ignition. How do we deactivate anti theft system.

sorry this is a dealer fix. but it could be as simple as programing a new key.
or it may need a new imoblizer module.

Posted on Apr 14, 2013

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How do I reset the anti theft on the car?

Tip & How-To about Cars & Trucks

Resetting a Vehicle Anti-Theft System This is how you reset an anti theft system if you have the anti-theft light on, or your car is cranking, but you have no spark.

Doing a full reset of the anti-theft system.

Disconnect both battery leads for at least two hours.
Hold the negative and positive leads together for 5 minutes to fully discharge any power.
Put the key in the ignition, but not turned on. VERY IMPORTANT!
Connect the positive lead.
Connect the negative lead in one swift movement.
Wait 15 minutes for the system to fully reset.
Posted by Andrew... on Jan 14, 2018

Resetting Vehicle Anti Theft System

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1 Answer

My car want start and the anit thef light flashing

need to reset the anti-theft alarm check manual. or call dealer.

Btw, I’m available to help over the phone in case u need at

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Changing the ignition has interrupted the passlock antitheft system. Here is a link that has some good info on it.

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My car wont start it was driving pretty but now it wont start everything else works.. is there a anti thef on

if the anti-theft system has been activated there should be a light on the instrument cluster that is lit or flashing.if no light is on then you have a different problem.

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If the security or anti-theft light is flashing when you attempt to start your car, and the engine does not crank or does not start, you have an anti-theft problem. The system may not be recognizing your key's key-less entry signal, or there may be a fault in the anti-theft module or wiring.
There is a reset procedure to stop this anti-theft light flashing.many a times this helps The reset procedure is as follows:-- Reset the alarm by locking and unlocking the drivers side door.Do this a couple of times and then check it will reset the factory security system . If the reset procedure does not helps then its time to get the anti-theft system checked.There is a short circuit in the anti-theft system wiring. For more detailed help on this anti-theft light blinking issues please click on the link below
Thanks. you can rate this solution and show your appreciation.

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1 Answer

2000 ford explorer

The theft light flashing indicates there was a problem detected with the anti theft system. The computer will have to be scan tested and either repaired or reprogrammed. This is a very complicated procedure and requires specialized equipment. You will probably have to have it towed to the dealer or a very well equiped private repair facility. You might want to try leaving the key on for about an hour or try another key but this rarely works. Good Luck.

Feb 05, 2009 | 2000 Ford Windstar

1 Answer

Anti theft

hi , not necessarily , did you replace the key and tumbler , or the ignition switch (electrical part) ? there is a password relearn procedure , attempt to start the vehicle , leave ignition on until THEFT SYSTEM indicator turns off , (approximetly 10 minutes) , turn ignition switch off , attempt to start vehicle , if vehicle starts , password has been learned ... if password does not relearn , i can post some diagnostic procedures .


Jan 21, 2009 | 1998 Pontiac Sunfire

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