On my A4B8 Avant, I've done the big replacement of both mirror assemblies (well, it seemed like a lot of work, stripping the housing off to fit chassis with wiring for folding, dimming heated and Elec adjusting. Not sure if chassis supported memory, but since I don't have memory seats, no worries)
So, fitted the mirror chassis, housing and dimming glass, coded the folding, but could not find coding for the dimming function.
Interior dimming still works, but neither outside dimming is working.
Have I missed the coding, or could I have other issues?