I have been working on the wiring for oil pressure issues and came across this. I don't know if I displaced this during my work in the engine bay or if it never was hooked up.

Any ideas? It has a brown wire and a yellow/black wire. Click to view attachment Click to view attachment

Thanks,
Buck

I think it's a diagnostic port that doesn't get hooked up.

Hmm. Looks like the same plug used for the optional rear window defrost that plugs into the relay board but the wire colors are wrong (at least compared to mine).