280z interior wiring question

I'm getting ready to undercoat the rest of the interior in my bronze '78 280z and then install soundproofing and new carpet.

Can anyone tell me where or to what this connector goes? It is part of the wiring harness on the passenger side floorboard and does not appear to be connected to the console wiring harness.

I've matched the parking brake and drivers seat belt warning light connections but forgot to label this one when I took the interior out.

Thanks!