Example 1

In the audio system controller (ASK) is located the relative node position 0. Then the ring break lies between the ASK and the controller that is before the ASK in the MOST ring (with vehicle fully equipped: Telephone).

To locate a ring break between two controllers, the controller which registered the relative node position 0 must be found. If the Ring break in the MOST group is currently present, only the Instrument Cluster and the Control Display can communicate with the diagnosis. This is possible because those two controllers are also attached on the K-CAN SYSTEM bus.

Since the signal transmission takes place in one direction, when the ring is interrupted there is no communication with the other controllers. Thus, the controller with the relative node position of 0 stored cannot be determined. Nevertheless, with a ring break, the two controllers between which the ring break is present may be determined. This is accomplished by a further method that is implemented in the MOST controllers:

The controller that lies after the one with the relative node position of 0 stores the relative node position of 1, the next controller in the ring stores position 2, etc.