Question about 1999 Pontiac Bonneville

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The security light in my 99 bonneville comes on and wont start

If i wait for the light to go off then i can start it right up

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You nay have a worn out ignition key pellet or broken wire inside the ignition switch that goes to the anti theft unit and it is being put in a passive mode which will allow the car to start after a waiting period.

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

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SOURCE: 99 Bonneville wont start, Security light on

when you locked your car did you use the fob to lock the car? If so close the car door and unlock the car using the fob!! If you use the remote/fob to lock the car you must use it to unlock the car otherwise the car will not start and will stay in Security mode. I have a 99 as well and found that little trick out lol.

Posted on Jul 26, 2009

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This may be related to the antitheft security system. The system is known for turning off the starter and/or injectors when it fails. When it's the security locked out starter, you won't even hear a click when you turn the key. Is there a light on the dash that says SECURITY or a picture of a car with a lock through it? This is a common problem worth looking into. http://www.diy-gm-security.com/

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You are seeing the beginning signs of a failing antitheft system. There are 3 parts to this system. The smart key, the ignition lock cylinder that reads the smart key, and the Theft Deterrent Module. (TDM) If any of these three parts are failing, you get a "no start" situation. Go to this link for a breakdown of the problem, and solutions to fix it.

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