2002 Chevrolet TrailBlazer Logo
Posted on Mar 30, 2009
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Why is security light blinking on a chevrolet trailblazer and will not crank? we put a new motor in truck and now the security light is blinking and will not crank

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Anonymous

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  • Expert 22 Answers
  • Posted on Apr 03, 2009
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That means there is a problem with the VATS System. This sometimes happens when the battery is disconnected for an extended period. You might need to do a relearn for the keys. You can get it done with the right scanner in 5 minutes, but there is a way to do it without one.

Turn the key to the start position, release it to the on position, then leave it on for 11 minutes, then turn it off. Repeat this sequence three times, and on the fourth try it should start if that was the problem.

  • Anonymous Apr 03, 2009

    Sorry, this is the proper key relearn procedure:




        Turn ON the ignition, with the engine OFF.

        Observe the Security telltale, after approximately 10 minutes the telltale will turn off.

        Turn OFF the ignition, and wait 5 seconds.

        Repeat steps 1-3 two more times for a total of 3 cycles or 30 minutes. Important: The vehicle theft deterrent system
        learns the key transponder information on the ignition switch
        transition from OFF to CRANK. You must turn the ignition OFF before
        attempting to start the vehicle.

        Start the vehicle. The vehicle has now learned the key
        transponder information and the PCM has now learned the fuel continue
        password.



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