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I been having some problems with my car's alarm. Well it does lock and unlock, but the horn doesn't make any noise. I check all the wiring, and everything is in working order. So do I need a new horn for my alarm??? Any suggestions??

 
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Does the horn work when using the horn button ??

 
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I forgot to mention that it is an after market alarm and no the horn doesn't work when I press the horn button.

 
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7th Generation ??

The horn relay and one of the other relays can be swapped as a simple test to rule out the horn relay. (the horn relay is the middle relay in the group of three relays on the far left of under-hood fuse box)

Not likely the relay more likely the horn itself, Do you have a test light or volt meter available ??

 
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yes i have a test light and i think it is the horn relay that is mess up. Do you know anyway it can be replaced and thanks for the info.

DT

 
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So it does use the factory horn ??

I was thinking after posting it may use another (siren type) horn. (they are for the most part a speaker)

The relays just plug in and out, The horn relay is the center one in the group of three on the far left of the under-hood fuse box. You should be able to here the relay click and possibly feel the click if you touch it.

Check that the part #s printed on the relays match (the ones in my 05 do) and simply swap it with one of the matching relays above or below the horn relay. (use a Sharpie and put a small H on the relay so you can keep track of its origin)

If it is not the relay the horn itself would be next to test. Tough to get to on a 7th gen Civic.