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Message: <blockquote data-quote="Schwepps" data-source="post: 394407" data-attributes="member: 3592">And to combat the scanners that car thieves use:While on the subject there is another unit comes into play. To prevent scanning of your system there is a blocker circuit on the car that if the car receives 10 consecutive incorrect code words from a remote, then it blocks the receipt of all signals (even correct ones) for the next 15 minutes. So of all the millions of possible code combinations a scanner only has 10 chances every 15 minutes. Not very likely. On top of that - even if they monitored your car while you used the remote to lock it. If they figured out the next code word in the sequence they would also have to figure out the "unlock" command. Not very likely.So please don't compare your BMW remote with that of your National or Jap car. Those are just simple RF transponders, child's play for car theft syndicates. Higher security is always less convenient. :top:</blockquote>