The problem is most likely the contact ribbon under the steering wheel, it has a broken printed circuit ribbon to the horn button, it is referred to as the "Clock Spring Contact Drum"
SOURCE: No horn on my '95 Grand Marquis. I have the
Your horn works off of the engine compartment fuse box. There will be Maxi fuses and regular fuses in it. The regular fuses there is one 15 amp fuse that fuse is for your horn relay. I don't know what direction they go in but it will be the 5th fuse in that row. Right next to that row of fuses there will be a row of Maxi fuses they should go in this order a 50, 50,40,30,50,40,30. In this same direction of fuses the # 2 relay in this order is your relay for your horn. If you remove this relay you should have 12 volts on 2 of these wires. There should only be 4 pins that are used in that relay even though it has for pins. The 2 power wires both work off of the #5 i5 amp fuse in the engine compartment. If you have power on 2 wires at the relay when it is removed then you will need to chack all the other wires where the relay is for a ground when someone holds the horn button down for you to check. If you have a ground when the horn button is depressed then the other terminal that is left in the relay that you removed I need you to take one of the power wires that has 12 volts and jump it over to that other terminal that is n't the ground wire for your horn when the pad is depressed. If the horn goes off then every thing is ok with that circuit then the relay has probably failed switch it with a simular looking relay in the engine compartment fuse panel then see if your horn works properly. If you don't have a ground at one of the terminals when someone holds the horn pad down. Then the problem is probably between the horn pad and the relay more then likely it is your clock spring in your steering column. Let me know if you need any more information then this.
SOURCE: 97 CAMRY TAIL LIGHTS NOT WORKING
Its right above the fuse box. You need to remove the plastic kick panel to see them
SOURCE: turn signal don't work or the flashers?
If you still have flasher problems, I read on Google to spray WD-40 down in and around the hazzard flasher button, then press it up and down several times...and BINGO...all flashers and signals worked again....just had some dirt and dust in the wiring....
SOURCE: horn does not work. relay and fuse good, need wiring diagram
Had the same problem myself i just replaced the horn itself.
SOURCE: 2000 mercury grand marquis horn doesn't work.
The horn is in the very front behind the grille on the drivers side. Eiher the horn is bad or disconnected or the switch in the steering wheel is bad.
Testimonial: "Thank you. I asssumed that the problem was between the relay socket and the horn. You told me the horn location and I found the cable unplugged."
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