I can only confirm that for me, it was pin7
I retro-fitted the BT over the weekend (I made my own loom) and pin32 on the 54pin plug goes to pin 7 in the 18pin plug in the centre console.
But that was for the ULF BT.
I don't want to give you advice that may damage your setup, so the only thing I can advise is to get the colour code off pin32 (in the 54pin connector) and trace it back to the console.
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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.
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