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Welcome, I'm Chris (aka Moose) I prefer working afternoon till just after midnight.
With the key in the run position if the theft light is flashing rapid this means the computer is not recognizing the correct keys being used or the battery is weak this has resulted in the vehicle being disabled.
You mentioned the headlights will not come on, that is a good sign the batteries are dead or have poor connection.
Can you test the batteries and do you have a volt meter?
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Hello again Chris here,