If the harness was bundled but not used...it usually has a sticker wrapped with it that should have the BMW part nbr. Can you see a label/sticker wrapped with the bundled wires?

You give no model/model year info...and don't say why the one suggestion is incorrect. But depending on build date & level of option pkg...the PDC, EHC, & trailer harness would be in that location next to the battery & radio (for Nav setup).

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