Renault Espace towbar wiring?

Hi, i have recently bought a towbar for my R-reg renault espace which has the wiring still attached (from an online scrapyard) but a can not find where, on the espace i am supposed to connect the wiring to, i assumed it would connect somewhere within the rear lights system but i can not find any diagrams to indicate which wires connect to which wires(if you know what i mean) i need help. PLEASE, Alan