You’re right it’s not the switch, when I change switch positions, an indicator warning on the DIC says auto lights on or off. I read in another post that it could be trailer wiring, since it seems to coincide with a trailer hookup a few nights ago, I’m leaning towards this now, but have checked all the trailer fuses under the hood, there was a 20A burnt out so I replaced it but the problem persists. Any ideas where i I should look next