All, My rear fog light refuses to work. No 12Vto the light. There is a good fuse and the the rear fog switch brightens as you would expect when you press it ( doesn't when you remove the fuse). Is there a relay for it somewhere and if so where? Or I'm down to tracing wires from the switch
As others have said it may well be the PCB board if a simple poor connection is not found. There is a rear fog light relay that provides conditional (headlights need to be on) power to fog light when selected. Unfortunately this hard wired micro relay is an integral part of the PCB. Have a look
here for Rog's investigation into a "stuck on" rear fog light, noting that relay driver transistor required replacement. I appreciate your issue is the opposite but note that one headlamp mode or other needs to be selected.
