M-Bus Topology

M-bus Topology




The M-bus consists of a three wire ribbon. On E38 vehicles because of the large number of stepper motors used, the M-bus is divided into two separate circuits. All other vehicles use a single M-bus cable. The M-bus wire ribbon is not routed with the test of the vehicle harness but is a separate harness attached to the IHK housing.

Always refer to the Electrical Diagrams to determine the exact wiring configuration for a specific model.