And 1991. C203 is in the same place, but this time C216 is next to the ECU. Also, the inertia switch is wired on the relay in 1990 &older. In 1991, the inertia switch is directly wired in line with the fuel pump power feed.
Here is a picture showing all four connectors on the driver floor side. The large black colored plug to the left has the blue-orange wire from the fuel pump relay.
Notice how dirty looking the wires/tape are on the engine side of the harness and how much cleaner the wire tape is on the passenger side - this leads me to believe there is a different harness coming from the engine into the driver side.
There are no orphan plugs that I can see -- but see the wires to far lower left that have been cut (like 4 red wires, 3 yellow and a blue) and I'm not sure where they ran to. I can take more pics, let me know what you'd like.
One other thing to check.
Pull out pne of the window switches.
87-91 have connections at the switch where they can be removed, like this.
92-93 it’s part of the harness
If it’s the latter then that helps confirm your interior harnesses are 1993.
As for the engine harness, we are assuming it’s 1991 due to the lack of fuel pump relay, but I wonder if we should shelve that assumption. Look over that harness fpr a label. I agreee that it looks like the harness is from a different car based on the filth on it.
I’ll look up those connections in a bit based on a 1993 as that part number confirms a 93 dash harness and the door locks will seal the deal that the wiring inside is all original.
As to how the fuel pump is wired, I think the cut wires have something to do with that
C203 Black 12-pin
C204 gray 2-pin
C207 gray 12-pin
C212 black 8-pin (this is the transmission harness)
C217 gray 8-pin (round)
C221 gray 8-pin
C224 blue 6-pin (converible onlu so may not be there at all)
C227. Gray 2-pin (door speaker)
C230 black 4-pin
C2104 gray 5-pin (convertible only so may not be there)