A4 Quattro Wagon V6-2.8L (AHA) (1998)
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Check bus wires for short circuit to B+ or Ground (GND).
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If there are no malfunctions found in the bus wires, check whether one of the control modules is responsible for a short circuit of the bus wires to
each other, to B+ or to Ground (GND).
Disconnect each of the control modules connected via the bus wires one at a time and check whether the malfunction "Hardware faulty" has been
eliminated.
If it was eliminated, replace the control module that is currently disconnected. If malfunction was not eliminated, re-connect that control module and
disconnect the next control module connected via the bus wires.