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What to Do If the Horn on Your Smart 451 Is Not Working?

Model: Smart Smart 451 - Years: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
Part: Checks and maintenance

See other generations:
Video tutorial

If the horn on your Smart 451 is not working, turn off the car and disconnect the negative terminal of the battery. Using a small flat screwdriver, locate the horn, which is centrally positioned behind the grille; disconnect the connector and clean the contact with fine sandpaper or a pointed tool to remove any traces of oxidation (green/white) from both the horn terminal and the cable connector.

A brass brush can also be useful; avoid using coarse files to prevent damaging the metal. Spray a little WD-40 or dielectric grease and reassemble.

If the problem persists, check the fuse.


Posted on 5 July 2026 by ScegliAuto


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by ScegliAuto

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