Question about 1998 Cadillac DeVille

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I reset my key fobs, now the car is disabled, won't start

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In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key all the way through the system. This is why the security light turns on and shuts down your starter, and/or the vehicle after 2-5 seconds. This link explains it pretty well.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Apr 22, 2014

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My alarm goes off intermittently


Try resetting the alarm, using the instructions given at the link below. I'll also copy the text here.

  1. Insert the ignition/door key in the door lock on the driver's- side door of your Mountaineer.
  2. Turn the key to the lock position.
  3. Turn your key to the unlock position.
  4. Turn your key to the lock position.
  5. Turn your key to the unlock position. Your alarm is now disabled. If your key fob works, you can also press the unlock or alarm-disable button on the fob.
  6. Start the Mountaineer's engine and allow the vehicle to run for at least 10 minutes. This will allow the alarm to relearn the default settings. You must make sure that you have disabled the alarm first, however, before you attempt to start the vehicle, so that the alarm will reset itself.
http://www.ehow.com/how_5978302_reset-mercury-mountaineer-alarm.html


If these instructions don't work, you can try resetting the car's computer by unplugging the battery for half an hour. However, that will reset the keyless entry code, as you can see in the fixya article I link to at the bottom

http://www.fixya.com/cars/t4755856-we_bought_it_used_and_we_dont_know_the_k



Jun 10, 2015 | 2003 Mercury Mountaineer

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Lexus sc 400 anti thieif could this be why my car don't start


Yes, car will not start or will start and run for about 20 seconds and shut off if the anti theft system is active. The theft system will either disable the starter circuit, cut the fuel injector circuit or both. Sometimes you can lock the doors with either the key fob or electric door locks, then open manually with a key and then lock with key fob, wait 30 seconds and unlock with key fob or key. Occasionally that will reset the system, or turn on ignition 3 times for 10 seconds each without starting the car, (turn key to where dash warning lights illuminate, but not to the start position), wait 30 seconds then start the car, for the ECM to relearn the key code. If that doesn't work, most likely will have to be reset at a dealership. Good luck!

Jul 17, 2014 | Cars & Trucks

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Replaced battery now remote start won't work, why?


The fob would need to be reset to the car computer - check your owners manual. On some models you press both keys at the same time.

Sep 25, 2012 | 2009 Pontiac G6

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2004 Hyundai Elantra won't start, emergency flashers keep blinking, can't shut off, lights dim, can't jump start, clicking from under dash from relays. What could it be?


The 'Keyless Entry & Burglar Alarm System" is activated. You must 'Disarm' the system using the Keyless Entry Remove (Key Fob) to "Reset" the system. The reason the engine won't start is due to the burglar alarm - it has a "Starter Kill" circuit which is activated when the alarm is activated. The alarm must be DEactivated to DEactivate the 'Starter Kill' circuit.
Another way to start the engine is to get in the car, put the key in the ignition and turn it to 'ON" and wait 3 to 5 minutes until the emergency flashers stop/turn off. Afterward, you should be able to start the engine. NOTE: This does NOT reset the burglar alarm. It will go off again when you enter the vehicle without using the remote/key fob.

Sep 06, 2011 | Hyundai Elantra Cars & Trucks

1 Answer

Just replaced the battery, now the car won't start unless I lock/unlock the doors using the key fob. How do I set it back to work the way it used to?


You most likely have an aftermarket fob and remote start unit.What is the brand on the back of your key fob?You will have to get the proper reset and registration procedures for the particular unit installed in your car to make your key work normally.

May 27, 2011 | 2000 Ford Mustang

1 Answer

Hit panic alarm on fob accidentally and wont turn off unless key is in ignition and turned on. as soon as key is removed from ignition panic alarm starts again. fob seems to be not working. can i manually...


reset the computer by disconecting the posative cable for 3min reconect it should cure the problem
if not have a disnostic run most auto parts will do this for free
hope this helps
Please leave feedback

Mar 21, 2010 | 2002 Saab 9-5

1 Answer

I changed the battery on my 2001 Tiboron and now the factory alarm system will not let me start the car. I do not have a key fob


In order to 'RESET' burgular alarm, you MUST have the remote keless entry fob programmed for the vehicle - no other way unless you want to bypass/disable the burgular alarm relay and alarm horn. This, however, does not disable the 'flashers' when the alarm is activated. Bypassing the relay will allow you to start the engine, but you'll be driving around with your parking lights flashing.

Sep 06, 2009 | Hyundai Tiburon Cars & Trucks

2 Answers

Car will not start


replace the battery in the key fob and unlock the car with that, if u last locked the car with the key fob, you armed the alarm and can only be disabled by unlocking with the key fob, the car wont start because its an anti theft feature.

Jan 16, 2009 | 2000 Hyundai Sonata

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