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The later professional radios moved the USB input from the trunk to the back of the radio.
Perhaps the previous owner replaced the radio (either because they wanted USB or because the display/something else on the old one died), and didn't reconnect the aux cable harness? I'd try pulling out the radio and seeing what sort of wires are going into the back of it, and also what part number it is.
Also possible that the aux plug in the armrest had cola or similar spilled into it and the sensor that triggers that a cable is plugged in is shorted.
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