Hi guys,
I'm replacing my GSM with bluetooth. The problem is that I have some special TCU (LINK P/N 84116904906, the antena coax cable goes to TCU instead of the armrest phone) and can't figure out what is its I-BUS pin. I have checked it's DB25 PIN in the trunk and no cable are attached to pin no 22 or 6, where I was supposed to loop-back the I-BUS from 18 ELO adapter.
Also, my 18 ELO adapter under armrest has no cable attached to pin 6, where I were supposed to install the 9&6 jumper (I-BUS cable is present on pin 9).
Did anyone successfully upgraded from such TCU to bluetooth? If yes - to which pin no should I loop-back the I-BUS from pin no 9 in 18 ELO connector under armrest ?
Any tip or help would be REALLY appreciated...

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E38 09'99, MK4, 16:9, Bluetooth 13th gen.