On my '07 530xi, I only have the one aux input behind the armrest. It's possible a previous owner tried to install a second concealed aux input and failed (or did a crappy job).
A much better solution is to install a Bluetooth module in the armrest console so that you can stream your music without wires.
2007 530xi, Black Metallic Sapphire, 6 speed manual, Sport package, Cold Weather Package, Premium Package, Premium Sound Package, Sirius Satellite Radio, MTech front bumper, Replica Style 166 wheels
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