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Message: <blockquote data-quote="Schwepps" data-source="post: 435322" data-attributes="member: 3592">A point to note: our security system is likely to be a pseudo-random number generator system. Ie, one click on the fob changes its stored code to another number by an algorithm. If the signal is received, the OBC in your car also changes its stored code to the same number by the same algorithm. This means the system is in synchronised state.If you then go click-click-click-click; or if you give your fob to your toddler to play with as a clicker, the fob and your OBC can become unsynchronised. Do that x no of times (depending on how many bits they're using as the code) and they can become permanently unsynchronised and you'll need to get it reprogrammed. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>