Ford Focus Horn Fuse & Relay Location (2012–2021) — Easy DIY Fix

Last Updated on May 9, 2025 by Nick

How’s it going everyone! If your Ford Focus horn isn’t working, don’t worry—it might just be a blown fuse or a faulty relay. In this guide, I’ll walk you through exactly where to find the horn fuse and relay on both the MK3 (2012–2018) and MK4 (2019–2021) Ford Focus models. Let’s dive in and get that horn honking again! So without further ado, let’s just get straight into it.

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🔧 Ford Focus MK3 Horn Fuse and Relay Location (2012–2018)

We’re starting off with the MK3 generation Ford Focus—the one shown here is a 2013 model.

✅ Step 1: Locate the Fuse Box

• Pop the hood and look for the engine bay fuse box on the driver’s side.
• Press the locking tabs to open the fuse box cover.

🔎 Step 2: Identify the Horn Fuse

• Look for the blue 15-amp fuse—this is your horn fuse.
• Use the included fuse puller or a small tool to remove it.
• Test the fuse for continuity, or swap it with a known good 15A fuse to check quickly.

💡 Pro Tip: The rear wiper fuse is also a 15A fuse. Temporarily swap it to test the horn.

🔁 Step 3: Check the Horn Relay

• The horn relay is located in the rear corner of the same fuse box—a small, square relay.
• If your fuse is fine but the horn still doesn’t work, this relay may be faulty.
• Try this: have someone press the horn while you tap the relay. If the horn suddenly works, the relay might be sticking.
• You can also swap it with the rear wiper relay (same type) to test without buying parts.

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🚗 Ford Focus MK4 Horn Fuse Location (2019–2021)

Now on to the MK4 Focus, covering model years 2019 through 2021. The fuse layout changed a bit in this generation.

✅ Step 1: Find the Engine Bay Fuse Box

• Open the hood and look for the fuse box between the battery and the passenger-side fender (nearside wing).
• If you’re not sure how to open it, I’ve got a video tutorial here to walk you through it.

🔎 Step 2: Locate the Horn Fuse

• You’re looking for Fuse #37, which is a yellow 20-amp micro fuse.
• Just like before—remove it, test for continuity, or swap in a known good 20A micro fuse.

⚠️ What About the Relay?

• Unlike the MK3, the MK4’s horn relay is integrated into the Body Control Module (BCM).
• That means it’s not accessible or serviceable in the same plug-and-play way.
• If your horn fuse is good but the horn still doesn’t work, the issue could be in the wiring or BCM itself.

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🔧 Final Thoughts: Diagnosing Horn Issues on a Ford Focus

That’s it! Whether you’re working with a 2012–2018 MK3 or a 2019–2021 MK4 Ford Focus, you now know how to locate and test the horn fuse—and in the case of the MK3, the horn relay too.

Need More Help?

Check out our YouTube video tutorial for a visual step-by-step guide. Have a question or another Ford Focus issue you’d like us to cover? Leave a comment below!

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