The "meep-meep" OEM horns that come on the Scion xB2 sound pretty wimpy. So I upgraded them to Fiamm "El Grande" model 74100 dual electric horns.
(This mod took place September 20 2011.)
I got these from Amazon for about $17 shipped. They draw less than 10 amps so they can use the stock wiring and fuse. The horns are wired to be always grounded, and are fed power via the horn button. A relay is included but for this application is not needed. The red covers and silver grills are optional. I used the grills but not the covers.
Taking the front nose cap off an xB2 involves over two dozen clips and bolts. I've done that six times already in the past five months for previous projects. So this time I decided to get to the OEM horns by just removing the upper baffle and upper grill. Here you can see the OEM horns after the upper baffle was removed (remove 5 clips).
Removal of the upper grill (remove 3 clips and 2 bolts, plus disengage 4 clips) allows easy access to the OEM horns. Note the horn on the drivers side is mounted sideways and the horn on the passenger side is mounted hanging down. (Why? I don't know...)
Here's a comparison of an OEM horn and a Fiamm horn. The Fiamm horn is larger in diameter and much thicker. Supposedly this is one of Fiamm's "smaller" horns.
I created more slack on the passenger side horn wire by undoing a wire mount. I bent the OEM horn bracket to allow the driver side horn to hang down. Otherwise this is a simple plug-and-play installation, you don't even have to alter any electrical connections.
A quick shot of flat black spray paint on the metal mount straps, reinstall the grill and baffle, and...done!
It's a good idea to point the horn trumpets slightly downwards, to prevent moisture from pooling inside the horns.
Here's a YouTube link to what the Fiamm El Grande horns sound like...for comparison, the stock Scion xB horns sound very similar to the Hyundai Elantra horns.
Next: Intermittent Wiper Switch
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