BMW Business CD radio AUX missing

Two things that you need to check if your AUX audio input is missing from your #BMW Business CD radio unit. When pressing MODE button you should see option to select CD and #AUX source. If your AUX source is not there, there are two things that need to be checked:
1. Is your radio properly coded? Sometimes coding might get erased, for example when cranking the car with low battery, due to voltage drops. You can use software like NCS-Expert to check if AUX is enabled. Module: RAD, function: AUX, value: aux.
2. Is your wiring connected properly? Loose connectors or broken cables will cause your AUX to malfunction or even disappear form the audio source list. Remove radio and check if connector is OK, also check if there's circuit continuity between radio connector and the AUX socket.
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