Example 1

From the DTCs stored in the memories, you have determined that control module 1 is not communicating with control modules 2 and 3

Fig 1: Schematic - Control Module 1 Is Not Communicating With Control Modules 2 & 3

Courtesy of AUDI OF AMERICA, INC.

Fig 2: Example 1 DTCs Stored In Memory - Control Module 1 Is Not Communicating With Control Modules 2 & 3

Courtesy of AUDI OF AMERICA, INC.

• Switch ignition off.
• Disconnect the control modules connected across the bus lines and check the bus lines for an open circuit.

  See appropriate System Wiring Diagram article.

• If you cannot find a malfunction in the bus lines, replace control module 1.