Comms Unit Wiring

[08m59]

2008 M59 1.6HDi Escapade.

Hi all, before I go completely mad and remove the dash for a third time! can anyone help please in confirming connections to the comms unit under the steering wheel please? I currently have 3 plugs connected, blue, brown, and grey and there is a fourth socket (2 pin) for which I cannot find a plug to connect to. A wiring diagram would be nice please. 

Thanks Mark

[08m59]

Found the problem, see my comments in heater matrix thread.
https://www.berlingoforum.com/thread-12793-page-3.html