Brief description of components

The following components are described for Comfort Access:

• Interior and exterior aerials 

  Different aerials are required for communication with the ID transmitter: Interior and exterior aerials

  The number of aerials depends on the model concerned:

  INTERIOR AND EXTERIOR AERIALS
  
  

  Interior aerials	E60	E61	E63	E64	E70	E81	E87	E90	E91	E92	E93
  Front center console	x	x	x	x	x	x	x	x	x	x	x
  Rear center console	x	x	x	x	x	x	x	x	x	x	x
  Rear window shelf (parcel shelf)	x	-	x	-	-	-	-	-	-	-	-
  Back of rear seat	-	x	-	-	-	-	-	-	-	-	-
  Luggage compartment, middle	x	-	x	x	-	x	x	x	x	x	x
  Luggage compartment, right	-	-	x	x	x	-	-	-	-	-	-
  Luggage compartment, left	-	-	-	-	x	-	-	-	-	-	-
  Luggage compartment, load edge	-	x	-	-	-	-	-	-	-	-	-
  Exterior aerials	E60	E61	E63	E64	E70	E81	E87	E90	E91	E92	E93
  Rear bumper, left	x	-	x	x	-	-	-	-	-	-	-
  Rear bumper, middle	-	x	-	-	x	x	x	x	x	x	x
  Outside door handle electronics	4	4	2	2	4	2	2	2	2	2	2

  The aerials emit 125 kHz radio signals which are evaluated by the ID transmitter.

• Outside door handle electronics 

  The number of outside door handle electronic units depends on the model concerned.

  The 3 sensors in the outside door handle electronics send the following signals to the CAS control unit and the CA control unit:

  • Unlock: When a hand reaches into the handle recess via capacitive sensor 1
  • Unlock: When a hand pulls on the outside door handle via tension sensor (redundant to capacitive sensor 1)
  • Locking and deadlocking: On contact with the sensitive area of the door handle via capacitive sensor 2

  A built-in aerial also sends radio signals in order to check for an ID transmitter located on the outside of the driver's door or front-passenger door.

  • E70, E81, E87, E90, E91, E92, E93

  The outside door handle electronics are installed in the outside door handle.

  • E60, E61, E63, E64

  The outside door handle electronics are behind the grip recess plate.

• ID transmitter 

  The ID transmitter evaluates the signals from the aerials. It also sends high-frequency radio signals to the FBD receiver.

  Inserting the ID transmitter into the slot deactivates all Comfort Access functions.

• Remote control receiver for remote control services 
  • E64, E81, E87, E93

  The remote control receiver is integrated in the interior mirror.

  • E60, E61, E63, E70, E90, E91, E92

  The remote control receiver is integrated into the aerial amplifier.

  The remote control (FBD) receiver picks up radio signals from the ID transmitter and forwards them to the CAS control unit. The Comfort Access control unit (CA control unit) activates the FBD receiver.

• CAS control unit 

  The CAS control unit (CAS: Car Access System) is the master control unit for all Comfort Access functions.

  The CAS control unit is the interface to the START/STOP button and to the slot for the ID transmitter. The electronic steering lock is also activated by the CAS control unit.

  The CAS control unit is connected with the following components via the K-bus (sub-bus):

  • Outside door handle electronics (number depends on model concerned)
  • Comfort Access control unit (CA control unit)
  • Electronic steering lock

  When the vehicle is idle, communication may take place on the K-bus without waking up the vehicle.

• START/STOP button 

  The START/STOP button can be used to switch the terminals in sequence (0, R, 15, R, 0). The engine can be started by depressing the clutch or the brake (manual transmission/automatic transmission) and pressing the START-STOP button.

• Slot for the ID transmitter/remote control 
  • On vehicles without  Comfort Access:

    In order to start the engine, the remote control must be latched in place in the slot.

  • On vehicles with  Comfort Access:

    The remote control must be inserted into the slot if the battery in the ID transmitter is discharged. The engine can then be started up.

    Inserting the ID transmitter into the slot deactivates Comfort Access.

• JBE: Junction box electronics 
  • E70, E81, E87, E90, E91, E92, E93

  The junction box electronics activates the central locking system.

  If the CAS control unit approves the unlocking of the vehicle, for example, the doors will be unlocked.

• KGM and KBM: Body gateway module and body basic module 
  • E60, E61, E63, E64

  The body gateway module actuates the central locking in the front doors.

  The body basic module controls the central locking in the rear doors.

  If the CAS control unit approves the unlocking of the vehicle, for example, the doors will be unlocked.

• Comfort Access control unit 

  The Comfort Access control unit (CA control unit) actuates the internal and exterior aerials.

  An ID transmitter scan is carried out. At the same time, the FBD receiver is activated for any ID transmitters which may respond.