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Are the temperature slider and the fan selector supposed to illuminate at night on a 4th gen Prelude SE? I could have sworn on my old Accord these parts lit up.
If so, any idea how to find and replace the failed bulb(s)?
Yup, they should. Remove the center console and the A/C module itself. Then get a flathead to remove the one of the tiny light bulbs that illuminate the bottom of the buttons to replace them. I can't remember the size of those light bulbs but you can always go to the junkyard and grab as much as you can. Make sure to test them though.