Anybody know the TI chip used in Ford 2002 and newer immobilizers? I've found a white paper on TI's web site that describes their challenge/response system, but nobody at Ford customer service has a clue what I'm talking about.
Ford calls it "securilock", but the Ilco tester at my local hardware store says it's a TI chip in the key. The dealer said it's a rolling code system, and from the white paper this includes a 40 bit challenge, an encryption operation on the key (!) then a 24 bit response from the key. If you lose one of the original keys they charge you several $100 to reprogram the main processor so you can start your car again!!! Fortunatly, I've found replacement keys for $8 off the net, and as long as I have 2 it should never be a problem. But TI has lots of different RFID systems, and I don't know if Ford has purchased a special mod for their own use or not (when you buy 10 million of something it does give you some clout). Anybody here know? Patience, persistence, truth, Dr. mike
