Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?
Can you tell me the serial number of the controller.
It is confusing to pull a manual from a site rather referring to the original printed manual accompanying the system.
There are some small prints on the circuit board along the bottom edge. If it is ... iss4. It will be the version 2.
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Richard L
aquamist technical support
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