Light switch dash bulb wiring?

Hi all, I always thought I had a blown bulb but turns out... NO. Any idea where the yellow wire should come from? The only black/yellow I could find in the car and in the wiring diagram is from the seat belt relay, maybe this empty connector? But Why would it be going to the instrument / switches lights? Needless to say that bulb in particular isn't working so any help is appreciated. I thought all the bulbs in there had the same wiring. Thank you.

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Author: DToro