The only electronic equipment in the trunk is the amp in the driver side quarter panel floor. This is a 2012 128i. Tweeters in the sails, 8" subs under seats, 4" mids in doors/rear panel. Hifi, professional h/u. I'm quite positive there's no fiber optics.
But OP said something about MOST loop being intact. He doesn't have L7, so I don't know how that's possible. But I asked because my audio isn't working, and the only thing left I can think of, is something software based or some module. H/u works, usb works, tried 2 amps, wiring is fine, speakers are fine.
I'm grasping at straws at this point.
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/// 2004 Silvergrey M3 · Coupe · 6MT · Slicktop · zero options
/// 2011 Jerez/Bamboo E90 M3 · DCT · Slicktop · IG: @na.s54
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