Passive Exit; Locking Procedure - BMW E90 Manual

The identification transmitter replies with a code via the high frequency link (315 MHz) to
the remote control receiver. This code contains data for the electronic vehicle immobilizer.
The car access system 2 issues the enable to start the engine for the DME/DDE and the
electric steering lock is unlocked.

Passive Exit

The passive exit function makes it possible to lock the vehicle without actively using the
ID transmitter/remote control.
Note: The vehicle cannot be unlocked without a valid identification transmitter
within a .5-1.5 m radius from a specific external antenna.

Locking Procedure

After the vehicle door has been closed, the locking procedure is started by touching the
recognition point/area on the outer door handle. The electronic outer door handle mod-
ule sends the request to lock the vehicle via the K-Bus to the Comfort Access System.
Based on the exterior and/or interior antennas, the Comfort Access System checks where
the ID transmitter is located. The ID transmitter is instructed to send an authentication
signal. In turn, the identification sensor sends encrypted data via the high frequency link
to the remote control receiver.
The CAS2 checks whether the ID transmitter is valid. Upon successful completion of the
check, the CAS2 issues the enable signal to lock the drive units and initiates the steering
locking procedure.
The JBE activates the central locking drive units.
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E90 General Vehicle Electrical