I don't think this is by design. I just noticed that the temperature control knob (middle knob) in my 06 Equinox isn't backlit, but the other two are. I think mine just went out, so I am interested in the answer too.
Did either of you ever get an answer to this question, I have the same issue, my temp knob doesn't light up anymore and took the piece apart tonite and each knob has a little tiny knob, I'm pretty sure they can be pulled out with a tweezer or something but want to make sure they aren't saudered or anything before I try. Also wondering where I can find a replacement as soon as possible so i can put the truck back together cause with the center trim piece disconnected my turn signals don't work, oh but I'll just use hand signals, wait I can't put my windows down either
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