Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. How to Replace a Horn Relay

How to Replace a Horn Relay

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

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

More related articles

Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...
P0477 OBD-II Trouble Code: Exhaust Pressure Control Valve Low
P0477 code means that the PCM has detected an abnormally low voltage reading often due to the exhaust back pressure control valve circuit.


Related questions

Q: Starter replaced. Battery at 12V. Still clicking

Hi there. Check all of the connections from the battery to the starter and to the ground. Make sure that all of the connections are tight and free of corrosion. Then check the relay to the starter relay that is...

Q: Anti-theft system issues after leaving key in overnight. Car won't start.

Hello. From what you describe it would appear that your security system may be activated and needs to be reset. This likely happened as a result of leaving the keys in the vehicle overnight. The procedure for resetting the security...

Q: No power at fuel pump fuse

Hi there, thanks for writing in about your 2007 Dodge Nitro. It is probably a faulty fuel pump relay which is located in the TIPM (Totally Integrated Power Module). It is not removable as it is soldered in place. You...