3.
There should be no continuity between the No.30 and No.87 terminals when power is disconnected.
Test the horn by connecting battery voltage to the 1 terminal and ground the 2 terminal.
The horn should make a sound. If the horn fails to make a sound, replace it.
Remove the horn relay (A) from the engine room relay box.
There should be continuity between the No.30 and No.87 terminals when power and ground are connected to the No.85 and No.86 terminals.
There should be no continuity between the No.30 and No.87 terminals when power is disconnected.
Disconnect the negative (-) battery terminal.
Remove the under cover.
Remove the mounting bolt and disconnect the horn connector, then remove the horn (A).
Connect the horn connector, then reassemble the horn.
Reassemble the under cover.
