Front electronic module (FEM): Front electronic module

The Front Electronic Module (FEM) represents a new generation which supersedes existing control units and their functions. As a result of the modular principle, the front electronic module can be installed in all model series.

The front electronic module is the central control unit in the vehicle electrical system. At the same time, the front electronic module is the gateway for the other control units.

The front electronic module safeguards functions from the following former control units:

• Footwell module (FRM)
• Car access system (CAS)
• Junction Box Electronics (JBE)
• Central gateway module (ZGM)

The front electronic module is the master control unit for the central locking system. All the functions for controlling the central locking system are integrated in the front electronic module. The front electronic module controls among others all the functions in the front section of the vehicle. For example, the front electronic module controls the central locking system for the doors and the fuel filler flap. The front electronic module evaluates the status of the door contacts. The front electronic module also identifies a request when the mechanical key is used to lock or unlock the vehicle.

The central gateway module (ZGM) is integrated in the Front Electronic Module (FEM). 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).

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.

Fig 1: Overview Of Front Electronic Module Components

Courtesy of BMW OF NORTH AMERICA, INC.