Try resetting the timer.
security light on 1998 s10 start but cut off
Sometimes my sons 2001 Grand Am does that. It has to do with the Security System. Turn the key to ACC the Security light will start blinking and will continue to do so for 10 minutes. At that time the Security Light will stay on. At that point you can start you car. This works for him Good Luck.
so no one will do something bad
90 minutes
Nothing
passlock
Yes, the blinking securtity light will blink when the car is off.
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There could be many reasons why a security light is staying on. There may be an animal that is in front of the light moving all the time such as a cat or even raccoon. The light may also be defective.
The security light flashes when a programed key is not installed in the ignition, when you insert a programed immobilizer key in the ignition the security light will go out, the light flashes as a theft deterrent
To reset the security system on a 2005 Chevy Cobalt, first, insert the key into the ignition and turn it to the "On" position without starting the engine. Leave it in this position for about 10 minutes until the security light on the dashboard turns off. After that, turn the ignition off, wait a few seconds, and then start the engine. If the security light continues to stay on or blinks, you may need to consult a professional for further assistance.
It should turn off when the key is turned to the 'on' position.