Sport RRS aux input not working!

Hi all, not been on for a while. Took a jump from my p38 to a 2007 3.6 TDV8 RRS. Just bought it, trying to get my aux input to work but no luck, there are a set of alpine LCD screens in the headrests so I'm assuming that's taken my aux. Anyone know how easy it is to get the aux input to work again? Tried following some wires but it looks like someone did a tidy job of hiding everything.

Any help would be great fully appreciated. Also any other tips on owning one would be great! Thanks