i'ts an e46 but this can be applied to any other Bmw with that system
The problem has been solved by using Rca for the audio and just 1 connector to the main harness (the ones that should go to the Bm24 is not connected)
i realized that the oem NAVI wiring loom got messed up as the installer (that modded the Bm24 and upgraded from Mir navi to monitor ) spliced some wires on it and welded those to the old Mir loom, that hasn't been removed, i suppose that something went in conflict on Ibus level on the bm24, to communicate with the AVIN.
now it acts exactly as if I had no navi, but with a connector not in the front but in the trunk.
i've able to run the extension by driver's side and RCAs under the carpet of the center consolle area...
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