2018 Sonny

Thanks for the info and your time.

So if I don't have the that RPO, does that mean no module and or just would need reprogramming if I switch it out. Also why would it be there if I couldn't use it? Thanks.

I have a 2018 Silverado 1500 Z71 4wd and I don't have the trailer brake switch on the panel ( small storage pocket). I pulled the trim panel and plugged into the back of the pocket to a dummy plug is a harness. Is that not for being able to add the factory switch by changing out the trim panel that has the switch? Confused on this subject Thanks