The wiring diagram does provide some information that you may find useful:
Here is what I gather from the diagram:
Check on the location C-129 PIN 15 in the passenger footwell, perhaps that is the connector which got wet?
Check for corrosion of PIN 15 on this connector, which is the horn wire. If there was water in the passenger footwell perhaps this wire has been soaking and corroding. If the wire looks fine, then have to check up the wire to the clock spring and finally the horn switch itself. Something is causing the circuit to ground and activate the relay.
Here is what I gather from the diagram:
- There is no computer in this circuit, it's only switches and relays.
- When the system is working normally, there is only one way to activate the horn, and that is with the Horn Switch on the steering wheel.
- The horn switch, when closed, provides a ground for the relay and will sound the horn.
Check on the location C-129 PIN 15 in the passenger footwell, perhaps that is the connector which got wet?
Check for corrosion of PIN 15 on this connector, which is the horn wire. If there was water in the passenger footwell perhaps this wire has been soaking and corroding. If the wire looks fine, then have to check up the wire to the clock spring and finally the horn switch itself. Something is causing the circuit to ground and activate the relay.