There is black overspray on the wires so I can't really tell what color they are.
Driver's seat does not have power lumbar on it. So I assume they are not the original seats?? What seats came with power lumbar on a 90?? I assume that only the driver's side had power lumbar??
I have to pull the carpet up anyway to replace the transmission wiring harness. Once the carpet is up, it should be easy enough to tell what it is for.
I have the same on my 90 LX, both driver and passenger seats. I also have the electric lumbar support, neither worked so I plugged them in and they still didn't work. Just figured my seats were faulty. Didn't have any seatbelt warnings after that so I'm just guessing it's the lumbar and old seats.