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The ignition key contains electronics in the key head that receive
energy from the controller module. Upon receipt of the data from the
controller module, the key transmits a unique code through low
frequency transmission. The controller module translates the received
signal from the key into a digital signal which is transmitted to the
body control module (BCM). The received signal is compared to an
internally stored value by the BCM. If the values match, the key is
recognized as valid and a vehicle security password is transmitted
through data link to the engine control module to enable fuel and
starting of the vehicle.
etc etc, re PassKey III
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