Question about 1991 Cadillac Seville

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Key stuck in ignition,security system active,cannot start car because of the problem,ways to shut off security system

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  • Anonymous Sep 15, 2008

    turned ignition switch to start car, lights went off and key will not come out of ignition.

  • GASAFIER Oct 04, 2008

    HOW DO YOU STOP THE SECURITY SYSTEM FROM DELAYINY STARTING THE CAR FOR 3 MINUTES. ALSO, THE HORN SIREN HAS BEEN GOING OFF UPON LEAVING THE CAR.WE BOUGHT IT USED, HOW DO WE STOP THIS FROM ACCURRING?

  • slay3r Oct 13, 2008

    I get home (luckily) and I try to turn off my 2000 cadillac seville sts to open up my garage with my keys when all of a sudden the key is stuck in the ignition. My caddy still turns on but the key was stuck and wouldn't come out. So I take my garage key out of the ring to open up my garage. I park it in my garage with the key still stuck. I mess with it by turning it from left to right constantly for about 7 minutes stuggling and somehow finally releases the key. I have no idea how I got it to release. When the key was released, for some reason starting the car up to see if it was fine came across my mind so I put the key back in and try to start it and it wouldn't start now. The security light was on and would not come off. I call up my mechanic and he comes down to take a look at it. At first he thought it was the key (becausen its kinda worn out and thats the only key I have), then he thought it was the ignition or some sort of electrical problem. He then noticed a tiny button underneath the steering wheel and he pressed it and held it (trying to start the car). I have no idea how he got it to start and neither did he but he was just messing with the button and he got it to start. What I want to know is how to properly do that so when it happens again I know. Thanks a bunch!

  • Anonymous Oct 14, 2008

    almost same problem, was driving the car starting acting up, it died and now will not start, key is stuck in ignition will not turn back to home

  • Anonymous Mar 12, 2014

    replaced lost jaguar ignition key but ignition wont start car

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Changing the key in the ignition

Posted on Sep 24, 2008

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The security, antitheft or lock picture/icon 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 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. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
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Not to insult your intelligence but is the shifter all the way in park? You may have an issue with linkage too. Or ignition switch needs replacement, (maxima's are also known for ignition replacement)
Other wise disconnect your car battery for ten min, just leave it sit, after ten min put ur battery cable back on, try ur key again.if you have a spare key work with the drivers door a little with locking and unlocking

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If my passenger door is opened and shut while the car is off it sets off my security system and if I do not deactivate it in time it will disable my ignition. Why would the passenger door set it off?...


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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.
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ignition keylock cylinder broke. you have to remove ignition switch and remove keylock cylinder and replace ignition switch keylock cylinder with new ignition key then you have to reset theft security system which dealership has to fix.

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THE ANTI-THEFT SYSTEM AT THE IGNITION WHEN TURNING IT ON WITH THE KEY WAS REMOVED FROM MY CAR WHEN I HAD A NEW TRANSMISSION INSTALLED 2 YRS. AGO. WHEN TRY TO START THE CAR I GET NOTHING. WHEN I START THE...


Can you please detail it...

  • Your car probably have an immobiliser kit with the security system
  • This cuts off the engine during a start under the hood
  • This kills the power from the ignition point
  • The keys may be code protected
  • Check whether your security system is still active even if the doors are open!!
  • Try to click the the unlock\ lock button simultaneously, when the doors are open
  • Its better to remove the fuse of the security system and cut it off

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I have a 2006 Pontiac G6 and I can't get the car to start and the key is stuck in the ignition. The battery is fine, lights and radio still work, but the engine won't even turn over. I tried rocking the...


Make sure that your shift lever is all the way into the "Park" position. Failure to have it all the way in park will cause the key to get stuck and the starter to not turn your engine over.

If you are sure that the shifter is all the way in Park. then your key cylinder could be faulty and you are most likely locked out from starting the car by the Security System. With a faulty key cylinder, the Security System "thinks" that someone is trying to steal the car and locks out the starter and the fuel system.

Replacement of the key cylinder requires re-programming of the computer system so that the security system will recognize the new cylinder and allow the car to start.

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Be sure its all the way in park or try neutral.Its possible that security system does not recognize the key. Is security light flashing or on steady? Shut all doors and windows,trunk,hood, turn off all accessory's,roll down drivers window, turn key off and remove for at least 1 minute, insert key into ignition, try to start leaving key to run position for 20 minutes, turn key to off,wait 15 seconds, try to start again leaving key to run, wait 20 minutes, turn key off,wait 15 seconds, try to start, again leaving key to run, wait 20 minutes, turn key off, wait 15 seconds, try to start. This should relearn key code. It may relearn after 1 learn cycle and start if system is ok. Hope this helps and that the weather is dry and warm for this procedure! This is not always a fix, but works most of the time.

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