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If you don't feel this answer is straight, sorry.
I believe that cable is the coaxial digital cable.
When that cable is present or required the two L and R audio wires are missing in the 6-pin at the changer.
In SOME X5s starting in 2003, if memory serves, BMW stopped using this cable and started including the two L and R audio wires in that 6-pin.
So if your 6-pin changer connector is missing the audio lines, that would mean you need the coax.
Since I don't know the year you have, I can't say... but I'm sure someone can.
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