Single Lock And Double Lock Function; Trunk Lock - BMW 1999-2005 M3 Service Manual

Central Locking and Anti-Theft
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Single lock and double lock
function
Each door lock actuator incorporates two
motors:
Single lock motor controls the
mechanical lock mechanism when the
central lock switch is pressed to single
lock the vehicle. The lock mechanism is
fully locked at this point but can still be
opened from the interior by pulling the
appropriate interior door handle twice or
by pressing the central lock switch
again. When single lock function is
activated, the fuel filler flap actuator is
not locked.
Double lock motor, also known as
central arrest, is activated only when the
vehicle is locked from the outside at the
driver's door lock with a key or when the
General Module (GM V) receives a lock
request from the remote entry (FZV)
system. In this case the double lock
motor is activated simultaneously with
the single lock motor. The function of the
double lock motor is to mechanically
offset an internal rod in the lock actuator,
disabling it from unlocking the vehicle
from the interior. This prevents the doors
from being unlocked by any means
except from an unlock request at the
driver's door or via the FZV remote key.

Trunk lock

The trunk lock can be operated with the
key but does not lock or unlock the
entire vehicle. When unlocked, the trunk
can be opened by pressing the trunk
release switch pad located above the
license plate or from the remote trunk
button in the left kick panel.
The trunk can also be opened from
inside the vehicle by pressing the remote
trunk lid release button in driver's
2/25/2009 10:53 PM