A6 V6-3.0L (AVK) (2004)
Using the DTC's stored in the memories, you have determined that none of the control modules are sending or receiving signals.
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Switch ignition off.
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Disconnect the control modules connected across the bus wires and check for a short circuit between the bus wires.
=> Electrical Wiring Diagrams, Troubleshooting & Component Locations binder
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Check the bus wires for short circuit to B+ or Ground (GND).
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If no malfunctions could be 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" is eliminated.
If it is eliminated, replace the control module that is currently disconnected. If it is not eliminated, re-connect that control module and disconnect the
next control module connected via the bus wires.