Tow Bar wiring, Xsara II est.

OK, got the tow bar on, now the wiring of the socket. Under the car, behind the rear offsidewheel, is a grey flat connector hanging down with 6 wires
going into it, but not connected to anything. I did hope that this might just be forward planning on Citroen's part to facilitate towbar wiring. Does anyone know whether this is the case, or what it is for?
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