8
E90 General Vehicle Electrical
Introduction
With the new 3 Series multiple control modules will be involved in the operation of a sys-
tem, similar to the “distributed functions” approach which has been successfully imple-
mented 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 initi-
ates.
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:
Index Explanation Index Explanation
1
Junction Box (JB) & Junction Box Elect (JBE)
4
Car Access System 2 (CAS2)
2
Roof Functions Center (FZD)
5
Footwell Module (FRM)
3
Comfort Access (CA)
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