I am also still having an issue with this. The top lightbars on the FPIU's only, do not operate. They look like they are blacked out with a texture issue. It is not the tint, or a dirty filter. It is strange. Have followed all your instructions. If you have any idea what this may be, that'd be great thanks.
I downloaded a DLC pack and only the top lightbar is not working for only the ‘16 and ‘20 FPIU’s. But does work for the tahoes. All the slick lights work. It is not the tint level and the xml file as i checked both of those issues. It seems to be blocked out by something and I can not figure it out.
If anyone has run across this, help would be awesome.