Exception in rendering!

Message: window is not defined

ReferenceError: window is not defined
    at new c (/tmp/execjs20161209-4303-1rp3x8pjs:136:3912)
    at m.mountComponent (/tmp/execjs20161209-4303-1rp3x8pjs:47:15602)
    at /tmp/execjs20161209-4303-1rp3x8pjs:49:31860
    at a.r.perform (/tmp/execjs20161209-4303-1rp3x8pjs:47:12503)
    at Object.a [as renderToString] (/tmp/execjs20161209-4303-1rp3x8pjs:49:31821)
    at r (/tmp/execjs20161209-4303-1rp3x8pjs:50:21164)
    at Object.S.ReactOnRails.serverRenderReactComponent (/tmp/execjs20161209-4303-1rp3x8pjs:32:6073)
    at eval (eval at <anonymous> (/tmp/execjs20161209-4303-1rp3x8pjs:173:8), <anonymous>:10:23)
    at eval (eval at <anonymous> (/tmp/execjs20161209-4303-1rp3x8pjs:173:8), <anonymous>:17:3)
    at /tmp/execjs20161209-4303-1rp3x8pjs:173:8

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

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

More related articles

The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
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...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: Cooling fan staying on after washing engine

Hello. Water may have gotten into a relay or the fuse box, which could be causing the fan to run or not work properly. I would suggest that you have a certified technician, like one from YourMechanic, inspect the cooling...

Q: Horn keeps on going off

Hello. There are a couple of reasons why your horn keeps going off. It is possible that one of the horn contacts is stuck or making contact in error. It is also possible that there is an issue with your...

Q: No heat, no sound, no nothing

Hi. An electrical diagnostic by a certified professional would determine if the blower motor, resistor, relay, wiring, and switch are operational. It is not unusual for the resistor block to go bad and certainly that can be looked at first....