Sounds like you need to do a 30 minute security relearn. Basically turn the key to the run position, do not start. Leave it in the run position for approximately 10 minutes. The flashing security light will go out. Turn the key off for 5 seconds. Turn it back to the run position for another 10 minutes. Again the light will stop flashing. Tune the key off and repeat one more time. When the light stops flashing turn the key of and then start the vehicle.
There are also plenty of references to this online as well. Good luck.
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