BMW 1999-2005 M3 Service Manual page 862

Central Locking and Anti-Theft
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Key incorporates an LED that
signals operator of signal
transmitting, key initialization status
and key self-test indication
Keys delivered with four different
colored labels. This is helpful to
differentiate FZV keys during
initialization, preventing possibility
of misassigning key ID which would
change coded Key Memory
functions.
Note:
A single unlock request from the
driver's door with the FZV key
unlocks the driver's door only. A
second unlock request unlocks the
remaining doors and trunk. This
feature can be modified for
individual users with the Key
Memory capabilities to activate all
lock actuators simultaneously. Car
Memory/Key Memory is covered
later in this section.
Starting with 2000 models, the
battery in the FZV ignition key is
recharged while the key is in the
ignition switch. Therefore there is no
need to replace the key battery.
The remote key receiver is part of the
antenna amplifier and is installed in the
left "C" pillar. The receiver produces a
digital signal based on the transmitter
command and sends it to the GM V for
processing. The GM V then carries out
all remote lock system, window/sunroof
convenience closing features and DWA
arming/disarming functions. The
frequency of the FZV key radio signal to
the antenna amplifier is 315 MHz. The
system is also used to convey the key
identification number being used to
2/25/2009 10:53 PM