HORN NOT WORKING

Number Description 1 Ignition relay 2 Windshield wiper relay 3 Horn relay 4 A/C switch relay 5 Not used 6 WOT relay (petrol) 7 Power hold relay 8 Fuel pump relay (petrol) 9 Low beam relay 10 High beam relay

Check your wiring diagram and check for power coming out of the horn relay. Suspect a bad relay.

You may still have a bad relay, or possible corrosion in the relay socket.

The horn relay primary receives + full time and is actuated by receiving ground (-) from the horn button. Check ground continuity at the horn button (at the steering wheel) to make sure it is working first (most likely culprit). If the horn button is working, check to see if the horn relay is working (second most likely culprit). To test the horn relay, provide chassis or battery ground to the (-) primary terminal of the horn relay and see if the horn honks. If it does, that will tell you that the problem is in the wiring between the steering wheel and the relay, most likely a disconnected wire at the steering column.
The only other components in the system are the fuse for the horn circuit (if you have 12v at the horn relay, that is fine), and the horn itself. My bet is on the horn button pad itself.

Check the horn relay to see if it works. Most cars use the same relays for multiple other functions. Check the part number on the horn relay and find another relay that is working that has the same part number. Swap out the horn relay with the known good relay. If that doesn't work, check all the wiring in association with the horn. If all the wiring is sound, then it is probably the horn itself, but that is very rarely the case.

Check the horn ground. By pass the relay and feed the horn at the relay terminal. Could be a bad wire from the relay to the horn.

There will only be one fuse for the horn. Find and check the horn relay. If that works check the wiring and the horn switch..

Start by having someone press the horn while you feel the relay with your finger. If the relay clicks when the horn is pressed then the switch is working properly and your problem is between the relay and horn assembly.

Remove and replace the Horn Relay. There should be a Spare Relay of the same Type (Size and Shape). OR
Switch out the suspected Horn Relay with another Relay in the Fuse/Relay of the same Type (Size and Shape) that is known to currently work. After the switch check the operations of both the Horn and the function you switched out. If the Horn works and the other function doesn't work any longer: The Relay was bad and needs to be replaced.

Could be bad horn or relay or the horn'button'.Start at the horn with a test light.Have someone push horn button and check for power at the horn.If no power then trace wires to relay,check for power cominginto relay.If power is going in but not out to horn relay is problem.etc. Some horns have a lttle knob you can turn to adjust them and get them working