hi, need help for my son, he has an N reg frontera 2.2 and his relay fuse box doesnt identify which relay socket deals with WHAT, can anyone help me with a breakdown on this as his uncle has juggled the relays without memory with the intention of fixing a heater that doesnt work but has caused the rear lights to stop illuminating as well as the heater remaining defunkt - p.s. the rear fog light switch doesnt illuminate either noe