Factory Service Manual. You could look up the security, read up on how it works or is supposed to work and all the various things that have the ability to make the light flash. Then in looking at some of the charts and security related issues, possibly find the "when all else fails and the stupid light is pissing you off change X part". I'm thinking it's not truly a security issue, but what it is...that's where I'm unsure.
Hey....have you swapped up keys lately? Maybe the key isn't "programmed" fully or something. Have you tried reprogramming your keys?
