Dash switches illumination

[Satch]

On my 2015 prostar, my center of dash switches (mirror heat, sleep temp, pdl, etc) switches along with radio backlight and a/c back light do not work.

This also seems to include the cruise control buttons on the steering wheel.

I have disconnected the batteries (all the positive cables completely) and the dash switches seem will illuminate. They go back off and stay off as soon as the daytime running lights initiate.

I have also noticed that the back light on my thermoking hmi (controller on sleeper wall) lighting is intermittent. Where would one start to look to determine the cause of this? Thanks in advance.