Question about 1998 Mercedes-Benz M-Class

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Mercedes ML 320 1998. My horn does not work

I was told there are two horns.I replaced theWhere are the horns located to test them?

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  • Anonymous Mar 29, 2014

    if where are they located

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About four things to do, first check voltage at horn with key on and button pressed. If voltage there try moving the small gap screw back and fourth a few times. If that doen't work replace horn. If no voltage check fuse and horn relay, you should be able to hear the relay click when you push the horn button, If not and fuse is ok. Switch relay out with another on on the car. If that doesn't fix it check the horn button for continuity.

Posted on Dec 27, 2008

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How do I fix the horn on 2006 Impala


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.
?‡'
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:
?€¢
Horn switch

?€¢
Horn PCB relay

?€¢
Horn assembly

?€¢
Body control module (BCM)

?€¢
HORN fuse 15 A

How cars clock spring works

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1 Answer

How do i replace the horn on 2010 patriot. Cant locate it.. anyone know


This vehicle should have 2 horns. One on each side. It would be unusual for both horns to be defective. Possible horn relay/horn pad or fuse problem. You can test the wiring with a test light for power and ground to determine if it is a horn or power/ground issue. Here is a generic picture of the horn locations.

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2006 buick lacross horn not working


This may be a bad horn or relay or fuse, you will need to locate the horns and have someone push on horn pad while you with a test light test for power at connector. If there is power going to the horns then the horns are bad, if there is no power then check fuses first, if fuses are good then replace the horn relay.

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1 Answer

Horn is not working on my 2001 Chevrolet Silverado. Also, when I set the alarm, the "beep" doesn't work. I'm assuming it's also the horn that makes the beep. Fuses are ok, replaced horn, tested...


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.

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2 Answers

The horn won't work checked fuse and it was okay, where is the horn located at?


Most likely you will need to replace the horn relay located in or near the main fuse box or under the hood in the high amp fuse box. If you have the owner's manual it will show the fuse box diagrams.

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1 Answer

The horn on my bmw 328i stopped working. How do you trouble shoot? How to do you replace?


1.check the fuse 2.using a test light check for voltage at horn while horn button is depressed if power is present horn is bad.horn is located behind the bumper. 3. if no power at horn and fuse is good suspect clock spring this part requires removal of steering wheel to replace and test.

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My 2005 Equinox horn quit, is there a fuse I can replace? It looks like a square box that marked horn on the fuse box.


Hello,
That's the horn fuse,you have located it;
I will assume that you have checked for a blown fuse, and that the fuse is good!! If not, check that first!With a test light and a jumper wire, you can locate the problem with little effort!
You can get a test light from any auto supply store, or from Wal-mart! They are only a few dollars and are a very helpful thing to have.

A jumper wire is just a piece of wire, that you can use to run power from one location to another! If you want to be fancy, you can put alligator clips on both ends!

-Start by locating the horns and pulling the wire off of one. Attach your test light to a ground and use the probe (pointed end) to connect to the horn wire.

-Have someone hit the horn button on the steering wheel! If the test light lights, then the horn(s) are bad and will need to be replaced! Just to be sure, take your jump wire and run from the positive battery post to the horn power connector (where you pulled off the wire) and make sure that the horn does not sound with direct power!


-If there is no power to the horn, you will need to check the horn relay to see if it is getting power. If it is the relay is bad! If there is no power to the relay, the problem is in the steering column or steering wheel horn button!


-Most likely the horn or the horn relay is bad!


Good luck!!!

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1 Answer

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who told you it was a horn pin, if it is ? it is located in the steering wheel pad, you have constant power coming from the relay, which is then earthed to the column when you press the horn, it could also be the relay or the horn itself, tests will need to be carried out

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First could you do a couple of test to confirm what is actualy wrong?You will need to buy a test light/probe to confirm power to the horn etc,the tester is cheap and a good addition to any self diagnosis you do on the vehicle.Try running a wire from the horn positive terminal directly to the positive side of the battery to make sure the horn actualy works.Also make sure it is securely bolted to the car,not loose as its bolted down tight to give the horn the earth it needs to work.If horn doesnt work when directly connected to battery you will need to replace it and problem solved but if it does work then you will have to check the power to the horn button cant remember exactly but I think its the centre of the steering wheel.Make sure the wire coming through the centre has power.Let me know how you go and if problem still exists let me know.Horn is usualy located at the front of the vehicle either behind grill or in the engine bay near to the headlights.good luck.

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