Question about 1998 Buick Skylark

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Security system light flashes, won't let car start

Everything that has to do with the security system has been replaced,some even a few times. Technicians at garage cannot seem to fix. Cannot get any help from GM. Is there any way to maybe bypass the security system to start the car ?

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Have they checked the key and the V.A.T.S. ignition?

Posted on Oct 11, 2008

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How do i fix this issue security light flashes even when key is inserted in the key lock


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My 1994 Isuzu trooper won't start not even the


Have you tried resetting the alarm by locking and unlocking the drivers side door?If you do this a couple of times in some cars it will restet the factory security system and allow the key to work again.
Some ignition keys have a resistor built into them and the cars computer is programmed to that resistance. The security system needs to verify the resistance for the key before it will let the car start. What I have read recently about this subject basically states that if you are having problems with a car not starting, won't turn over, no clicking but the car still has power....and everything seems fine in the car....battery, starter, alternator, etc. but the security light comes on in the car and the car eventually does start usually 5 minutes or so later then it is the cars security system that is causing the problem. It doesn't recognize the resistance of the key. It sounds like the security system needs to be replaced or bypassed. A friend of mine has a '94 olds royale 88 that started having this problem a few months ago. The car isn't fixed yet but that is just because I just found this information on the security systems on the internet a few days ago. It looks like it is a somewhat common problem with some of the cars that GM made when they first started installing the Passkey I, II and III systems into their vehicles. I hope this helps and if someone else has more information on this subject I would be interested in hearing about it.
And you should check the ignition key switch on the steering colum it will have one of the two wires broken.This sets off the security system which kills the ignition and the fuel pump system.When replacing the key switch make sure you buy one from the dealer most aftermarket switchs are poor quality and if go through the trouble of taking the steering wheel off and parts of the colum do the job right the first time.After you put the new key switch in remember to connect the two wires in the correct electrical terminal.Turn the key to the on position and wait about 10-20 minutes for your computer to recongnize the new switch and program it into it's memory and your car should start right up.

Jun 04, 2013 | Cars & Trucks

1 Answer

Flashing security light, engine won't start


The security, antitheft, or passlock light is a visual indication that something in the car's antitheft system is failing. 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 misinterperates 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. This is why the security light turns on and shuts down your vehicle.
This link may help you find ways to bypass this or fix it yourself.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Mar 01, 2013 | Cars & Trucks

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Do you see a light on the dash that says SECURITY or ANTITHEFT? Disconnecting your battery can trigger your antitheft system.

Here is a link about the security.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Dec 30, 2011 | Cars & Trucks

2 Answers

Turn the car off went into the store came back out tried to the start car and it was a no go. Car has spark and fuel pumping to the system i am thinking it jumped time but if there is any other...


The security light is 100% the problem. Let me say that again, one hundred percent. GM's are equipped with an anti theft security system. These systems are notorious for failure, and when they do, you get exactly what you have. A car that won't start with a security light on. The problem is figuring out why the system is failing. Could be anything from a bad key, to the actual anti theft computer called a TDM. (theft deterrent module) ive had great luck with just bypassing the whole system. Saves money and time. Prevents future problems. And you can do it yourself. This link will explain everything you need to know and give you ways to fix this yourself for hundreds less than a mechanic. http://vatspasslockpasskeysecurityhelp.yolasite.com/

Sep 08, 2011 | 2002 Pontiac Grand Am

2 Answers

Security light blinks car won't start disconnected the battery used a different key still won't start


need to reprogram the security system. turn the key to start position then to run . let the key stay on until the light stops flashing. repeat these steps 3 times then the car should start if there is not a problem with the pass-lock sensor in the ignition switch or the BCM( body control module).

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1 Answer

When I try to start car, it won't start and security light blinks. I'v e had to ignition switches put on before and I had a new key made. Car still won,t start.


If any of the gauges are blinking and going haywire and the security light flashing then the instument cluster is faulty.But if it is just the security light flashing then its in the switch.If you only had the switch replaced then you need a new ignition lock cylinder because its worn out.

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Security light flashing and it kills the car - can not start


Till u can get it to the auto shop, turn everything off turn your key like you are going to start it when it gets in the start spot let it go, then wait 13 mins dont touch nuttin. after waiting 13 mins turn the key in the off position, then start it and it will start right up so far i have had to do this twice and it works every time. It has something to do with the Security system I have an appointment monday to have chevy look at it and find out what it is.

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The factory security light will remain on - this is a standard feature indicating the car is dead.
First, unplug the hazard fuze in the engine bay (this will reset the ecu and remove the flashing)

Next, replace the battery with a new one (or one with proper charge) - keep in mind a small battery will not do anything for these cars, the engines require a lot to push them over (it isnt a honda)
*Make sure to clean the positive and negative battery cables from acid

Then just start it up :)

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