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E90 General Vehicle Electrical: Introduction: Notes

With the new 3 Series multiple control modules will be involved in the operation of a system, similar to the "distributed functions" approach which has been successfully implemented on the E60, E63/64, E65 & E66. With the launch of the E90, the distributed function concept will be continued and further developed.

The associated optimization of the wiring/cabling through fewer interfaces is also an important aspect when evaluating cost reduction and assembly time.

For diagnosis, on the other hand, the concept of "distributed functions" signifies a new challenge. In terms of the control module, it is no longer apparent what functions it initiates.

In the E90 there are several systems (i.e. Central Locking, Power Windows and Interior Lighting) whose functions are distributed over the following control modules:

Fig 1: Identifying Control Module Location
G03393590Courtesy of BMW OF NORTH AMERICA, INC.

To get a better understanding of the concept of "distributed functions" using the Central Locking System as an example.

To date (E46), the "Central Locking" function was located primarily in the General Module (GM) or, on the E60 in the Basic Body Module (KBM) and the door modules.

The "Central Locking" function in the E90 is distributed over several control modules (Car Access System, Junction Box Electronics Control Module & Footwell Module). Distributing functions over several control module offers the advantage that sensors and actuators are connected directly to a control module in the vicinity of their installed location, which result is shorter cable connections. By interlinking the control modules, it is possible to exchange sensor data between them.

The primary control modules for the systems in the E90 are:

The distributed functions concept is used/identified in the following General Vehicle Electrical Systems:

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