Thank you for using just answer.
You cannot disarm the anti-theft system.
Have you tried anything?
Do you have a spare key?
There might be a communcation problem with the remote start with the computer or the
transcevier went bad on the key cylinder.I want you to remove both batteries for 15 mins
to reset system.This might clear up the error.
Is the anti theft light still flashing fast?
Did you try both keys?