Front Electronic Module (FEM): Notes

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 (FEM) can be installed in all series. The Front Electronic Module (FEM) is the central control unit in the vehicle electrical system. At the same time, the Front Electronic Module (FEM) is the gateway for the other control units. The Front Electronic Module (FEM) 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) as an independent control unit. The aim is to reduce the number of control units and improve component networking. At the same time, the optimization of the wiring harness reduces the physical bus capacity.

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 (FEM) can be installed in all series. The Front Electronic Module (FEM) is the central control unit in the vehicle electrical system. At the same time, the Front Electronic Module (FEM) is the gateway for the other control units. The Front Electronic Module (FEM) 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) as an independent control unit. The aim is to reduce the number of control units and improve component networking. At the same time, the optimization of the wiring harness reduces the physical bus capacity.

The following functions of the Car Access System (CAS) have been integrated in the Front Electronic Module (FEM).

• Terminal control
• Electronic immobilizer
• Comfort Access
• Electric steering lock
• Central locking system

The following functions of the Junction Box Electronics (JBE) have been integrated in the Front Electronic Module (FEM).

• Power window regulator
• Wash/wipe system
• Washer jet heating
• Climate control
• Seat heating
• Mirror heating
• Automatic air recirculation control
• Rain-light-solar-condensation sensor

The following functions of the footwell module (FRM) have been integrated in the Front Electronic Module (FEM).

• Exterior lighting
• Brake light
• Interior lighting
• Exterior mirrors

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. The programming data are transferred to the vehicle by Ethernet via the central gateway module (ZGM).