Example 3:

Based on DTCs stored in the memory of the control modules you can tell that none of the control modules transmit or receive.

CONTROL MODULE DTC - EXAMPLE 3

Control module	DTCs stored in memory:
1	Hardware faulty
2	Hardware faulty
3	Hardware faulty

Switch off ignition.
Disconnect Bus-wiring from all control modules and check wiring for short circuit between wires.

Fig 1: Schematic - Checking Wiring For Short Circuit Between Wires

Courtesy of AUDI OF AMERICA, INC.

Check Bus-wiring for open or short circuit to plus (B+) or to Ground (GND).

Fig 2: Schematic - Checking Bus-Wiring For Open Or Short Circuit To Plus (B+) Or To Ground (GND)
Courtesy of AUDI OF AMERICA, INC.
If Bus wiring are OK, check for short circuit between all control modules and Bus wiring to plus (B+) or Ground (GND).

Disconnect one control module after the other and check whether fault "Hardware faulty" has been corrected.

If yes, replace the disconnected control module. If not, reconnect the control modules again and disconnect the next control module connected to the Bus.