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john aka eauto
john aka eauto, The Car Guy
Category: Mazda
Satisfied Customers: 16051
Experience:  ase tech,shop owner
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I have a 2010 Mazda CX-9. Last night I discovered my horn is

Customer Question

Hi, I have a 2010 Mazda CX-9. Last night I discovered my horn is not working. I checked the fuse and it was bad. I replaced it with another 15A fuse, it it blew right away. Does this mean there is a short somewhere? Could the horn relay be bad?
Might be related, but when we get a really heavy rain or go through the car wash, the alarm/horn will start going off seemingly randomly, like some water got in somewhere. After a while it clears up. But, I havn't washed the vehicle and we haven't got any rain recently. I had seen an issue with CX-9 with moon roofs having issue with drain clog causing water to penetrate BCM. My vehicle doesn't have moon roof so don't think there is an issue there.
Submitted: 12 months ago.
Category: Mazda
Expert:  john aka eauto replied 11 months ago.

usually thats a bad horn try unplugging one horn at a time see if the fuse still pops

Customer: replied 11 months ago.
John, you are right. I picked the high horn and disconnected it. When I tried to honk the horn, still no sound but the fuse did not blow. Connected the horn, then when tried to honk the horn, fuse blew.Two follow-up questions:
1) Does it make sense that the low horn doesn't make a sound when high horn is disconnected?
2) Do I need to just replace the high horn?Thanks,
Expert:  john aka eauto replied 11 months ago.

exactly there is a low tone and a high tone 2 tones

Customer: replied 11 months ago.
should I replace both horns?
Expert:  john aka eauto replied 11 months ago.

id start with the one you unplugged

Expert:  john aka eauto replied 11 months ago.

but horns are cheap it cant hurt to just replace them,, aftermarket are probably 20 bucks each

Expert:  john aka eauto replied 11 months ago.

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