I can verify this, my Ls430 53 plate fogs front and rear only work with the main lights on, just tested it.
As for a fuse, i would guess it is in the rear fuse box, in the boot near side under the carpet, not checked this as yet, going for a looksee now.
Ok just had a look, no fuse in the boot fuse box, got cold so came indoors, i would have checked the other fuse boxes around the car but i can't get the car indoors where it's warm.
Just drive the car into the house where you can check in a nice warm environment,other owners apparently do :)
lexus in house.jpg
Valet parking at it's very best.
Dunno why they are protecting those alloys with the wood blocks, they have to be the ugliest alloys on any car, Lexus should be ashamed they used them on a nice car like the SC.
Agreed, they are one numb set of wheels, although can be slightly improved by removing the middle bit.
Actually, wheels are not Lexus strongest suit, either aesthetically or in terms of endurance.
They aren't alone though, back in my Honda days, there were numerous posts about Civic TypeR alloys being exchanged under warranty, due to corrosion.