Fahrzeugbordnetz System (FBS) used in Mercedes-Benz vehicles.

​Mercedes-Benz has always been known for its innovative and advanced technology, and the FBS system is no exception. The FBS system is a vehicle electrical system that is responsible for the proper functioning of the different systems in a Mercedes-Benz vehicle. Over the years, the FBS system has undergone several revisions, and each version brings new features and improvements.
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The first version of the FBS system, FBS1,
was introduced in the early 1990s and was used until around 1998. FBS1 used a two-wire communication system between the different control units. The two-wire system enabled the control units to communicate with each other and allowed for basic functionality such as turning on the lights or opening the windows.

FBS2,
which was introduced in the late 1990s, was a significant improvement over FBS1. FBS2 used a faster, four-wire communication system, which enabled more data to be transferred between the control units. With FBS2, control units could communicate with each other in real-time, enabling faster and more precise functionality. The faster communication system also allowed for more advanced features such as automatic climate control and electronic stability control.

FBS3,
the current version of the FBS system, was introduced in the mid-2000s. FBS3 uses a high-speed Ethernet communication system that enables even faster and more reliable data transfer between the different control units in the vehicle. The Ethernet communication system provides more bandwidth, allowing for larger amounts of data to be transmitted. This enables advanced features such as remote diagnostics, software updates, and advanced driver assistance systems (ADAS).

FBS4
is the latest version of the FBS system and is currently in use in new Mercedes-Benz models. FBS4 includes several additional features such as improved cybersecurity and over-the-air software updates. The FBS4 system is designed to be more energy-efficient, reducing the overall energy consumption of the vehicle. It also includes more advanced ADAS features, such as lane departure warning and blind-spot monitoring.

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