On my wiring Diagram there is mention of a
Apart from that its just fusebox, wires and a switch
Hope that helps 
EDIT
Added a picture of the diagram from which i took reference ( hope there's no copyright issues lol )
http://img159.imageshack.us/img159/3949/diagram.jpg
Also could possibly be on the Right hand side of the dash on uk models
though im not entirely sure.