Ground for passenger seat.
This plug is on the passenger side foot well. The blue wire on top is where you pin the wire into to have a OEM relayed and fused system. The same wire in the corresponding plug goes to the pink plug near the AC under-dash box. I found a wire that worked with the plug so I could pin it right in and still retain the factory look. Note: make sure you route the wire with the rest of the wires and not behind the bracket as shown in the picture.
Some random pictures as I’m putting the dash back together. Note the fuel pump relay and its ground.
There is a yellow/blue stripe wire that runs along the with the SMJ but outside of the SMJ. This wire goes to a connector and continues on to the ECU common wires. I didn’t cut anything when pulling apart the WRX harness so I was able to just pin it into an empty spot in the RS bulk harness. No soldering, I can unplug stuff if I need to. Just a cleaner look. And conveniently there is a plug that has the same size of pins as the one needed and one empty spot. This picture shows the empty spot in the plug.
Again same picture just a bit farther away.