BMW 740i Owner's Manual page 32

the electronics work
heart of this system is an elec-
chip which is integrated into the
he lock mechanism itself is actu-
dual-function device, simulta-
ly serving as a communications
ace designed to allow the security
m to maintain a continuous stream
able, vehicle-specific signals with
ectronic circuitry in the key. The
m will not release the ignition, fuel
on and starter unless it recog-
an "authorized" key.
Force applied to the key can dam-
age the integrated electronic cir-
A damaged key can no longer be
to start the engine.<
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