Any clue what may have occurred to cause this to occur, like a part changed or battery disconnected?
Is the battery voltage good?
If the voltage is good and nothing was done to cause this then you likely have a PATS transceiver faulty and the key code can not be read so the computer thinks your a thief thus the rapid flashing theft light. In that case you need a diagnostic tool to program the keys to the vehicle after making any repairs. A mobile locksmith can come to you or you can tow it a shop to have this done.
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