L322 tow bar electrics

Had my 54 plate vogue for a whole week now and loving it!!
When I bought it there was no removable tow bar but after a bit of luck on eBay I managed to get hold of one, after fitting it I have tried to get the electrics to work and they appear dead even though the socket looks like it's never had a plug in it.
Where do I start??

look in the drivers side boot panel to make sure there pluged in first and that the little control units in place.

thanks for that looked there and no control box !
why would anyone take that out ?
anyway got one today and fitted it, all now working so thanks for your help