My climate control illumination failed a while back. When the lights in my car are illuminated, the climate control unit has no lights whatsoever. None of the buttons nor on the display. The display works fine though, and the unit seems to be ok as it still works correctly.

I pulled it out and saw there is a white bulb holder on the bottom. Twisting it out reveals a single bulb. I thought this surely has to be the culprit and purchased a few to replace it and have as spares.

Well, it did not correct the issue. I tried three new bulbs and still no illumination.

Am I missing another bulb somewhere? Has anyone encountered this? I would appreciate any suggestions as a new one of course in ridiculously expensive!

TIA