Have you ruled out the horn air solenoid valve by disconnecting the wires to see if it stops blowing? A spring causes it to stop blowing the horn which may be wore out or stuck.
I don't know where that connection is in the wiring you asked about. I would guess it's on the engine side of the firewall because the PCB and Horn Fuse are both located there. However a short to the horn wire you highlighted should not cause the horn to blow because the highlighted wires are both always energized when the ignition switch is on.
I don't know where that connection is in the wiring you asked about. I would guess it's on the engine side of the firewall because the PCB and Horn Fuse are both located there. However a short to the horn wire you highlighted should not cause the horn to blow because the highlighted wires are both always energized when the ignition switch is on.
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