Where is the horn relay located

the diagram you've posted is not for a 84-88. the fuse block in the drivers footwell looks nothing like that and it doesn't have any relays. I'm having the same issue and will continue to trouble shoot. when i put power to the blue and yellow wire the horn will work, just have to figure out where the horn gets the power from.

@Daniel Miller You are right. That was for a later model! As for your horn, Japanese vehicles are wired differently. They send power from the fuse to the horn, then to the switch. So when the switch closes , the power flows through the switch to the ground, this is known as "switched ground". Your power should come from the hazard flasher circuit.

my hazards are working but no my horn tho

@marcusadie671 did you check the horn? did you check to see if you get the power? What have you checked? Same make and model vehicle?

I don't know how old that threat is however you may want to check the wiring that's in your wheel well you're going to have to strip your sheathing back and check your bundle of wires somewhere in there there's a spot where they connect wires together for power and I'm betting that your problem is in that Loom you have a corroded connection or a broken wire I had the same thing on my 84 happened to me years ago