Brief description of components

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 135i, and 2010 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

The junction box consists of the distribution box and the junction box electronics.

JBE: Junction box electronics
The junction box electronics unit combines numerous functions in a single control unit. The junction box electronics unit is connected via 4 plug connections.

A 54-pin connector connects the instrument panel. Two further connectors are for the connection on the main wiring harness. These connectors are 54-pin and 47-pin. A 23-pin internal connection directly connects the junction box electronics to the power distributor.
Electrical distributors
The fuses and various plug-in relays are located in the junction box distribution box. The boards in the distribution box are connected to various relays, depending on the equipment specification. There is an opening in the lower section of the junction box. The junction box electronics unit is connected with the distribution box through this opening.

NOTE: For current details about the pin assignment and fuse assignment of the junction box electronics and the power distributor, please refer to appropriate WIRING DIAGRAM article.
Different versions of the power distributor are fitted, depending on the model series and Model Year measures. For example, the complete fuse assignment may change as part of Model Year measures.

03/2007 Model Year measure (not E70, E71):
primarily changes to pin assignment
09/2007 Model Year measure (not E70, E71):

primarily changes to fuse assignment
Depending on the vehicle equipment, various relays are mounted on the boards in the power distributor.