Horn not working?

Tiny
ANDREWMILLER
  • MEMBER
  • 2012 FORD FUSION
  • 130,000 MILES
Fuse okay. Car here relay clicking. No voltage at horn motor. No lock chirp with remote but has lights. A wire diagram will be very helpful. Thanks
Thursday, February 8th, 2024 AT 3:31 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
Hi,

If you hear the relay clicking, then you must have an open between the relay and the horn itself, or fuse 24 has failed. Power to the horn comes directly from the relay.

I attached the wiring schematic below for you. I cut it in half to make it readable, but I did overlap the two so you can follow from one to the next.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.
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Thursday, February 8th, 2024 AT 4:27 PM
Tiny
ANDREWMILLER
  • MEMBER
  • 6 POSTS
I'm not getting voltage at horn motor yellow wire with a direct battery post negative. I'll try further upstream on yellow wire, but I do not have an under-hood relay at fuse block. The clicking is under dash and maybe body control mod?
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Thursday, February 8th, 2024 AT 4:49 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
You are correct. The relay is in the vehicle and not under the hood.

Andrew, explain how you ran power directly to the horn. The circuit's ground is provided by a black wire with a gray tracer. Check if there is continuity to ground via that wire.

Next, if you apply 12v power where the yellow/orange wire connects, the horn should work if the ground is good. If it doesn't, the horn is likely the problem.

Let me know.

Joe
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Thursday, February 8th, 2024 AT 6:39 PM
Tiny
ANDREWMILLER
  • MEMBER
  • 6 POSTS
I'll start again tomorrow and let you know. Thanks
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Thursday, February 8th, 2024 AT 6:59 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
Sounds like a plan. Let me know if I can help in any way.

Take care,

Joe
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Friday, February 9th, 2024 AT 12:02 PM
Tiny
ANDREWMILLER
  • MEMBER
  • 6 POSTS
Looks like I now have 12.3-12.7 volts with horn switch closed now but no tone. Any idea what measured horn motor resistance should be. Getting 87 ohms one time to 109 ohms the next.
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Friday, February 9th, 2024 AT 2:20 PM
Tiny
ANDREWMILLER
  • MEMBER
  • 6 POSTS
The inner fender liner has a tire rub through that apparently filled both horns with water and caused the terminals to corrode. I will replace and retest. Thanks for listening.
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Friday, February 9th, 2024 AT 3:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
Hi,

If you are getting power, the horns are likely faulty. Let me know if the new horns work for you.

Take care,

Joe
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Friday, February 9th, 2024 AT 4:45 PM
Tiny
ANDREWMILLER
  • MEMBER
  • 6 POSTS
Replacement horns fixed the problem.
Thanks
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Friday, February 23rd, 2024 AT 11:38 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
Hi,

Thanks for the update and you are very welcome. I'm glad to hear you got it taken care of.

Take care of yourself and feel free to come back anytime in the future. You are always welcome here.

Joe
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Friday, February 23rd, 2024 AT 8:20 PM

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