i'll check - most probably the wire for the second coil ends up in the phone connector in the trunk, The antenna also has the extra "fon" port on its amp (whose pin I borrowed to repair the main trigger pin to raise the antenna).

I can bet the mute function is also in that serial connector

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)