...problem I seemed to be having was after the change the interior cabin lights flash as it's writing. That part seemed pretty normal. But then when I'd start driving the lights came back on again. If I used the switch to turn them off, only the front ones would turn off...rear seat stayed on.
So a bit more on this (or I'm a moron on this). When I finally made the change to 726-45-01 xxxx 7Fxx xxxx so that I could write the values for DRL - Parking Lights and Low Beams Only...namely the change at 726-50-01 02xx it would mess up my truck. The front and rear cabin lights would stay on at all times. While truck was running they'd start to dim like they were turning off, then jump right back to full intensity...over and over and over. No way to turn them off. Even when you'd leave the truck and lock it the lights would stay on. Anyway, I went back to 726-50-01 108E (as built) and everything seems to be working fine.
So question, is the default function of DRLs on 2018s Parking Lights and Low Beams?? I tend to think that I was trying to force something that I already had. Doh! IDK, I give up...think it's all working how I want.