Example 1:

From the codes present in the DTC memories, you can see that control module -1- has no connection to control modules -2- or -3-.

Fig 1: CAN-Bus DTC Memory Codes - Example 1

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• Switch off ignition.
• Disconnect the control modules which are linked by the bus wires and check whether there is an open circuit in one of the bus wires.
  Fig 2: Example 1 Schematic - Control Module 1 Has No Connection To Control Modules -2- Or -3-

  Courtesy of AUDI OF AMERICA, INC.
• If no malfunction can be found in the bus wires replace control module 1.