Of course, you must check the Aux-In cable is physically plugged in to the radio tuner in the boot.
If it is and it still doesn't work then the BM54 might be too old.
AUX should appear when the cable harness is connected, regardless of whether a device is plugged in to the vehicles Aux-In socket.
The cable harness has the trigger (a resistor) that the radio detects to determine if the Aux-In harness is connected or not.
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