Location of horn relay does not work

System Description
The horn PCB relay is non replaceable ,soldered to the underhood fuse / relay box. . You would have to take the box a part to get at it . Is the air bag light lit on the instrument cluster ? Could have an open wire in the Clock spring , do you know what a clock spring is ? It is inside the upper part of the steering column , It allows the steering wheel to be turned full right to full left keeping the horn an all the buttons an air bag connected electrically. When the horn button is pressed, ground is applied through the horn switch contacts and the horn relay control circuit to the coil side of the relay. The horn relay coil is then energized, causing the relay switch contacts to close applying voltage through the horn control circuit to the horns. For theft deterrent functions, the body control module (BCM) also controls the horn relay by applying ground to the relay control circuit to the relay.
Circuit/System Testing
With a test lamp connected to ground, probe each of the test points on the HORN fuse while activating the horns. The test lamp should illuminate at one or both of the fuse test points.
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If the test lamp does not illuminate at either test point, refer to the Horn Switch Test.

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If the test lamp illuminates, refer to the Horn Test.

Ignition OFF, disconnect the inline harness connector C275. Ignition ON, test for B+ between the horn relay control circuit terminal B and ground.
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If less than B+, test the control circuit for an open/high resistance. If the circuit tests normal, replace the underhood fuse block.

Momentarily connect a 3-A fused jumper wire between the control circuit terminal B and ground. The horns should work.
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If the horns do not work, replace the underhood fuse block.

If all circuits test normal, test or replace the horn switch

The PCB relay horn system consists of the following components:
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Horn switch

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Horn PCB relay

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Horn assembly

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Body control module (BCM)

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HORN fuse 15 A

How cars clock spring works

Relay sounds like its working, horn is located between grill and radiator. And it sounds like horn is bad

Most of the time it is not a fuse, it is the relay. Horns use alot of voltage to work , and therefore use a relay to close the circuit to make the horn blow. some relays are under the dash, some behind gloveboxes and a few in the engine compartment. You give no make or model of your vehicle so I have no Idea where it would be. You will need and electrical schematic of your make and model to locate the relay.

2001 malibu horn fuse and relay are located in the under the hood fuse box.
location 21 should be the relay
location 43 should be the fuse.
if the relay is put in wrong the horn will not work. if you replaced the relay and the horn stopped working try pulling the relay out and turning it around. and try the horn again.

replace horn relay and horn fuse. horn relay is located in the fuse box inside your hood. horn fuse is located in your kick panel, which is beside the foot pedals inside your car

There are a couple of relay locations. There is one in the engine compartment located on the left inner fender. You will have to remove a cover to see the fuses and relays. I believe there is another panel with some relays inside the cab on the firewall behind the foot pedals on the left. Again you will have to remove a cover to see them. Not sure where the horn relay is located. If you still have your owners manual it should identify all of the fuses and relays. They are easy to replace, you just pull them out like a fuse and put a new one in. Use a test light if you have one to see if you have voltage at the horn when the horn button is pushed and check any grounds your horn might have. If you have voltage at the horn maybe the new horn is bad also. That can happen.

the explorer has two horns, they are both mounted under the driver's side headlight behind the front bumper. you will need to remove the splash shield to get to them. Hope this helps you

simple circuit, but can be hard if problem is switch in steering wheel. First check fuse and relay at fuse box. relay should click when horn button on wheel is pushed. If relay doesn't click, either button or relay is bad. If relay clicks, test for voltage at horn. You can use a simple test light available at the auto parts store if you don't have a voltmeter. If there is voltage at the horn, replace horn.
If relay does not click, replace relay to see if that fixes your problem. If new relay doesn't fix, you have a bad switch in the steering wheel or possibly bad wiring. cannot help you with switch as it's different on every car. any questions--let me know.

Horns have power to them all the time. When you push the horn button, you are completing a circuit by providing a Ground.


Before the horn gets it's power for the 2003 Pontaic GrandAm, the power goes through a Horn Relay. (Number 21 relay)

It may be a bad relay, horn slip ring contact button, (Located under steering wheel), or bad horn/s.

The horns are located up under the front air dam, tucked up close to the air conditioner condenser. VERY hard to get to.

Under the hood of your jeep on the passenger side there is the Power Distrubution Center (PDC). Remove the lid and thered will be fuses and relays in there. I could not locate the exact location of the horn reley, but if you start removing them one by one you can find the horn relay. You will know the right one when the horn stops.