On the Audi loom:
Pin 8 - Earth
Pin 7 Perm live
Pin 4 switched live
Standard ISO layout
Pin 8 - Earth
Pin 7 switched live
Pin 4 perm live
So the adapter should swap 4 & 7 as Audi wire them back to front.
However if your Audi is 2000+ then you won't have a switched live on the Audi loom as Audi changed to CANBUS to control this function. So you either pair it with perm live and rely on switching the HU on/off manually or you need to wire one in from the fusebox. The fuse you need is Radio S-Kont.
Rear speakers are separately amped. You need to use the other part of the PC9-404 adapter to link the rear RCA's on the HU to the 20 pin mini ISO connector on the Audi loom, then connect the flying lead on the same adapter to the power antenna lead on the new HU
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