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Check the 25 A Fuse in location B3 of the fuse box in footwell (cheap part).
If the fuse is ok, check the relay in relay location 10 (should be located in fuse box area also) The relay should be labeled as part# 141951253B (may be other relays with same part# (you can swap with) in relay locations 9 and 18-22).
Check location #40 inside the fuse box. Location #44 is at the bottom right of the 3 columns of horizontal fuses. #40 would be the 3rd from the top of that column. Make sure you divide the fuse box in three sectors as you can see how they are placed together. It should have a 20A spade fuse color yellow.
If the fuse is fine you might have a bad relay located inside kick panel above the pedal area. When facing panel, location #1 is the top left with relay #53. With the ignition on engine not running, operate horn switch and listen if the relay is clicking. If it doesn't, there could be wiring harness problem. You could also spray WD-40 lubricant inside the horn throat. This will help release seized coil inside from moisture, you may need to whack the back of horn to persuade the coil to vibrate.
There is the actual horn located in front of the radiator on the support.
I would also check the horn relay. You want to make sure that when depressing the horn button you are getting 12 volts to the horn, but it needs to go to the relay first.
I have a diagram for you :
2000 Ford Expedition Horn Relay Location
Please let me know how it goes.
In the PCM is where the Horn Relay is. It's location should be annotated on the underside of the cover you pulled off to gain access. One way to determine if it is the Relay or not is to find a similiar Relay (shape and size) and switch them. If this fixes the Horn problem it is the Relay and should be replaced.
Check the horn relay, it is located under the dash near the fuse box. I believe it is on a white box. You may need to purchase a new relay or there could be a problem with the horn button in the steering wheel/column. Check relay first.
The horn(s) burn out very easily, also there is a relay, press the horn button repeatedly and listen for a click noise (it may be under hood), if you don't hear it the relay may be at fault, if you do the horn is burned out, not uncommon.
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