There is an RJ45 Jack in my center console, ss the RJ45 connected to the telephone circuit?

If it is part of the circuit and I connected a bluetooth dongle to the rj45 jack...would it work? Would I be able to use my cell phone thought the telephone portion of the radio?

Pretty sure that connected to the phone cradle. Without all the other supporting hardware I don't think it would do anything. Further complicated that the car has the fiber optics connections.
Might want to ask in a different forum though

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