Example 1 Audi A8 D3

Example 1

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

Scheme 21

Scheme 22

1. Switch ignition off.
2. Disconnect the control modules connected across the bus lines and check the bus lines for an open circuit. See appropriate System Wiring Diagrams article.
3. If no malfunction is found in the bus lines, replace control module 1.