Dedicated wiring kit for towbar electrics

hi new to this site.
i have owned K12 diesels since their introduction in 2003. i use them for driving school cars.
my question is:
i have fitted a towbar to the vehicle and i purchased the wiring kit from Nissan because i wanted the original wiring because some of the wiring is also used for data.
most of the wiring makes sense apart from 1 red wire the diagram shows it going from the rear to the front along the offside to around the footwell area can anyone help me an tell me what this is for? and has anyone else installed one of these kits
 
Back
Top