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The chips are usually simple RFID devices, powered by electrickery induced by the radio signals from the car's immobiliser. The chip then simply 'broadcasts' back its unique ID. The immobiliser checks the ID and decides if it's the right one.
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Aye, thats what my vw has, but if that were true for this car why did it have a battery in the fob, and why did it need changing? Suppose could be remote lock circuit is on battery, immobiliser is simple inductance loop yoke like you say. Hmmn... maybe I've answered that myself, don't mind me.
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I'm Mike. Kylie is an SK3 with OE lowers, R&G bungs, OE double bubble, Scottoiler, Starcomm, Hamicad tail tidy, bruised and in need of a wash.
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