There was some suggestion removing the mirror glass and cleaning some contacts can influence behaviour of the dipping function.
Mine had a meltdown after the new mirror bodies were fitted, but some perseverance with setting it back to normal and reinstating the memory setting seemed to sort it and it's never happened again.
If you stick it in reverse it should dip with the mirror control set to L, and either moving out of R or moving the mirror adjuster to off or R should also see it return to the original position.
You always see mirror modules for sale, but not sure I've ever known one actually fail?! You'd expect a fault code if it did....
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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