Second connector (behind the spare wheel) is for the trailer connection loom. You add a trailer module (in the cubby next to the battery) and the trailer connection loom to this connector and you have the correct trailer wiring (monitored bulbs, modified ABS/DSC modes, disabled rear PDC etc.).
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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
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