The Engine Immobilizer or Theft Deterrent System light is blinking

Its the factory light with the picture of the key and car.Its a red light that blinks.First of all i will say,check the basics.That is ....all doors, trunk, hood to be sure they are closed properly.Also checked the shift selector and the ignition switch to make sure it is in the Lock position correctly.Try starting the engine a few times with both keys and see if it starts fine.If all this