I did a little testing and had a few questions to anyone that can answer them. I can’t take the car into a dealership because it has a rebuilt title. Neither seat belt works. I tested power into the box and it’s fine. However, if I’m reading the diagram correctly, it appears that there should also be power into the box from the ignition (blu/wht wire). Also, the box is from my other Integra where the seatbelts were working fine. I have tested this wire at the switch and it’s good. It goes up into a tangle of wires under the dash and then comes out (haha terrible detective work, sorry) and runs behind the seats (to each belt motor) and back around to the box. It has no power here. Any pointers?
Solved! Apparently, the backup fuse (7.5A) applies to the seatbelts.