I gambled that this was the wire you were talking about.. From pin3 on the door handle (G415) to C12 on the Driver door control unit (J386). Grey/black wire.
Your pin assignment and wire color must be from a different year or something I guess, the B-plug in my Elsawin diagram is the one going to the door card switches.
I pulled it from the plug on the control unit, so didn't have to remove the door "subframe". But looked inside the "inspection hole" over the door handle, and I can see electrical tape in there...so someone have definitely been inside there and "repaired" something before...
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06 A8 3,0TDIq My daily driver and project...
97 A4 1,8Tq. Powered by a 4,2 from the '01 S6, full rollcage, FIA seats and 6-point harnesses, B5 RS4 KW Competition race suspension, B6 S4 brakes, 18" Toyo RS1 slicks, carbon fiber roof. V8 trackday racer 
14 VW Caddy 1,6TDI from my employer..
(X)00 A8 2,8q, (X)97 A4 1,8Tq, (X)92 S4 2,2Tq, (X)92 80 2,3E
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