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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  • Master
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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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Posted on Jan 02, 2017

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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:
?€¢
Horn switch

?€¢
Horn PCB relay

?€¢
Horn assembly

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Body control module (BCM)

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HORN fuse 15 A

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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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