Electrical upgrade

Was messing around under the dash while removing interior and pulled down some relays. One has numbers 3588587 and 36033-K. The other has 3488904, 93596-A, and 0253.

I believe the first is the horn relay (my car doesn't have a horn yet).
The other, I have no idea. Anyone know what it is?

There are wires coming out from my seat belt bases and going who knows where. What the heck are these for? I don't think I'm going to hook them back up.

Also looking for a diagram or something for the light and wiper switches as well as heater controls if anyone has them.