Nope, on the factory supplied factory installed fogs that switch operates a relay in the pdc. The only way it can get hot is if there is too much current going thru it. It's possible that there is carbon build up going on in the relay in the PDC and that there may be some arching inside the relay from the fog lights power to the switch side of the ckt, it happens. Result could be that the fogs are drawing power thru both their primary contact points and some leak thru from the switch side thru the headlight low/high point. I just gave it a quick look in the fsm but it is not detailed enough on the construction of the factory relays, don't know if they are solid state or electro mech either. I've seen solid state relays do some nasty stuff where you have 5V on the switch side and 220 on the power side and the material inside the relay breaks down. If they are SCR's it could get interesting..