FEM/BDC Cloning

Front Electronic Module (FEM) / Body Domain Controller (BDC)

The Front Electronic Module (FEM) or Body Domain Controller (BDC) represents a new generation which supersedes existing control units and their functions. As a result of the modular principle, the Front Electronic Module (FEM) or Body Domain Controller (BDC) can be installed in all series.

The Front Electronic Module (FEM) or Body Domain Controller (BDC) is the central control unit in the vehicle electrical system.

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At the same time, the Front Electronic Module (FEM) or Body Domain Controller (BDC) is the gateway for the other control units. The Front Electronic Module (FEM) or Body Domain Controller (BDC) provides functions from the previous control units

• Footwell module (FRM)

• Car Access System (CAS) 

• Junction Box Electronics (JBE)

• and central gateway module (ZGM) 

The central gateway module (ZGM) is installed in the Front Electronic Module (FEM) or Body Domain Controller (BDC) as an independent control unit. The aim is to reduce the number of control units and improve component networking. At the same time, the optimisation of the wiring harness reduces the physical bus capacity.

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Functional description

The following functions of the Car Access System (CAS) have been integrated in the Front Electronic Module (FEM) or Body Domain Controller (BDC)

• Terminal control

• Electronic immobiliser

• Comfort access system

• Electric steering lock

• Central locking system
   

The following functions of the Junction Box Electronics (JBE) have been integrated in the Front Electronic Module (FEM) or Body Domain Controller (BDC)

• Power window regulator

• Wash/wipe system

• Washer jet heating

• Climate control

• Seat heating

• Mirror heating 

• Automatic air recirculation control (AUC)

• Rain-light-solar-condensation sensor
   

The following functions of the footwell module (FRM) have been integrated in the Front Electronic Module (FEM) or Body Domain Controller (BDC)

• Exterior lighting

• Brake light

• Interior lighting

• Exterior mirrors
   

The central gateway module (ZGM) is integrated in the Front Electronic Module (FEM) or Body Domain Controller (BDC). It is seen as a control unit within the control unit, as the central gateway module (ZGM) acts as a self-sufficient control unit within the Front Electronic Module (FEM) or Body Domain Controller (BDC).

The task of the central gateway module (ZGM) is to connect all bus systems. This combination allows general use of information from the individual bus systems. The central gateway module (ZGM) is able to implement various reports and speeds on other bus systems. The programming data are transferred to the vehicle by Ethernet via the central gateway module (ZGM).

The Front Electronic Module (FEM) or Body Domain Controller (BDC) is located in the A-pillar of the passenger footwell and controls all functions in the front section of the vehicle.

 

Structure and inner electrical connection

The front electronic module (FEM) or Body Domain Controller (BDC) is connected to the vehicle with 9 plug connections.

To avoid confusion during connection, connector housings of the same colour have different encoding. This prevents them being inserted in the wrong position inadvertently.

The input for the voltage supply of the FEM/BDC is a 1-pin plug connection.

Fuses for the following consumer units are installed in the fuse block of the Front Electronic Module (FEM) or Body Domain Controller (BDC):

• Central locking drive

• Outside door handle electronics

• Powertrain of the power window regulators

• Light operating facility, operating facility for the assist systems and steering column switch cluster

• Rear Electronic Module (REM) and headlight driver module

• Fanfare