Our 2005 350L is our third Hyundai. With regard to the heater/air conditioner "lights", indeed they are just about impossible to read in sunny weather. The trip computer and clock are slightly (but not much) better. The numbers and letters are there, though. I would have to assume it was a design fault as against anything specific with your (and our) car. :-(
As a footnote, our 2005 Sonata GLS-SV center console lights are brighter, but still leave a bit to be desired on a bright day.
Our 2000 Sonata GLS did not have the automatic temperature system, so the only center console "lights" was the clock which was bright and easy to see in any level of brightness. Kent
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