I have a 2000 Sonata and the dash illumination lights don't work. I'll pulled out most of the dash trying to trace the problem but no luck. All fuses are good but I don't show any power at the rheostat. The funning thing is that the ashtray light does work.
I'm not sure if it's related but a few days before we noticed the dash lights out, we heard a clicking from under the dash, from the tail lamp relay I guess. Every time there was a click, the parking lights flashed. I turned on the lights and it stopped. It was a few days before I drove after dark to notice the dash lights
One other thing, most diagrams show differences for with or without DRL. I could have sworn that I did have them but they don't seem to be working now.
BTW I haven't installed anything except a remote starter 2 years ago and I've got all the diagrams and instructions from
Stuart