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Hello Zara. No, your car does not have the relays fitted already (unless someone has fitted a 12S previously). Complete kits are available from caravan shops etc.

The relays ensure that the fridge is disconnected when engine off (to prevent discharge of car battery), same applies to the van battery (you dont want the van battery discharging thro' the car or vice-versa) As your van is a late model, it is essential that you fit the complete 12S kit, as modern vans require this for the correct functioning of the 12v electrical system (Habitation relay, etc)

may help

Trailer Wiring I

Socket and plug wiring instruction
12N Normal Socket		12S Supplementary Socket
1)	Left indicator	1)	Reverse
2)	Fog	2)	Battery Charge **
3)	Earth	3)	Earth
4)	Right indicator	4)	Power feed
5)	Right side light	5)	Spare
6)	Brake	6)	Fridge **
7)	Left side light	7)	Earth for pin 6 (1998 on)
**NB It is essential that pin 6 is wired through a split relay from 1998 on!!