How to Replace a Horn Relay | YourMechanic Advice

How to Replace a Horn Relay

Car horns are used for a variety of purposes, not least among these safety. For a car horn to work properly, the vehicle must be equipped with a functioning horn relay.

typical horn diagram

In most circuits, when the horn button (usually located in the steering wheel pad) is depressed, power is allowed to flow through the horn relay to the horn assembly. Typically, there is power supplied to the horn relay at all times. Pushing the horn button completes the ground side of the circuit, pulling the relay contacts closed and causing the horn to honk.

A bad or failing horn relay probably requires replacing. Follow this step-by-step guide to learn how to perform this repair.

Part 1 of 2: Removing the old horn relay

In order to safely and efficiently replace your horn relay, you will need a couple of basic tools.

Materials Needed

diagram of a junction or fuse box

Step 1: Confirm the location of the horn relay. Typically, the horn relay is found in the engine compartment junction or fuse box. Consult your owner’s manual for the exact location.

hand disconnecting the negative battery cable

Step 2: Disconnect the negative battery cable. Open up your vehicle’s hood and disconnect the negative battery cable with a wrench or ratchet. Then set it aside.

hand removing the junction lid box

Step 3: Remove the junction box lid. Locate the junction or fuse box within the engine compartment and then remove the lid.

removing horn relay

Step 4: Remove the old horn relay. Remove the horn relay by pulling it straight out.

Part 2 of 2: Installing the new relay

hand installing the new relay

Step 1: Install the new relay. Install the new relay by lining up the terminals with the slots in the junction box and plugging in the relay.

junction box lid being replaced

Step 2: Reinstall the junction box lid. Replace the lid on the junction box.

Step 3: Reconnect the negative battery cable. Reconnect the negative battery cable and tighten it down.

After following these steps, you should now have a horn that blows nice and loud. If you’d prefer to have a professional tackle this task for you, the certified mechanics at YourMechanic offers expert horn relay replacement service.


Schedule Horn Relay Replacement
Service Area

$86.57 - $129.70

Price range for all vehicles
Average rating from 10 customers who received a Horn Relay Replacement.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Excellent Auto Repair Ratings.

4.2 Average Rating

Auto Repair

Service Hours

7 AM - 9 PM

7 days a week

Phone Number

Phone Hours

Mon - Fri / 6 AM - 5 PM PST

Sat - Sun / 7 AM - 4 PM PST

Address

We come to you at no extra charge

Guarantee

12-month/12,000-mile warranty

Service Area

Recent Horn Relay Replacement reviews

Excellent Rating


YourMechanic Horn Relay Replacement Service

Average Rating

5/5

Number of Reviews

10

Rating Summary
10
0
0
0
0
10
0
0
0
0

Theodore

15 years of experience
1217 reviews
Theodore
15 years of experience
Infiniti EX35 - Coolant is leaking - Lynnwood, Washington
Very knowledgeable and easy to understand...
Acura TL - Starter - Sammamish, Washington
Did a good job.

Larry

28 years of experience
13 reviews
Larry
28 years of experience
Chrysler Sebring - Horn Relay Replacement - Indianapolis, Indiana
Good job

Max

16 years of experience
35 reviews
Max
16 years of experience
Jeep Grand Cherokee - Horn Relay Replacement - Auburn, Washington
Only chatted real quick, I had work, handed him the keys and it was fixed. While at work I received photos and a summary of what was done including audio. This was my fist time using yourmechanic, works great especially as an introvert, I hate going out in public (war brain thing) so this really takes the edge off

Patrick

32 years of experience
1148 reviews
Patrick
32 years of experience
Honda Civic - Horn Relay - Austin, Texas
Professional, and willing to help!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE