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Relay Switch for new horns

Discussion in 'Gen 2 Prius Accessories & Modifications' started by mi56598, Oct 24, 2006.

  1. mi56598

    mi56598 Junior Member

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    Question, been searching forever. We have 4 2006 Prius's and 2 2005's in the family. I would like to replace the stock horns with new air horns by Stebel "Nautilus Compact Series" www.stebel.it that come with a relay. Thought of patching in the relay to the terminal in the front fuse box location and grounding but first how do I disconnect the power or batteries like regular cars. Or can it be done without disconnecting. I asked the dealer to do it but they blew it off and said they forgot. Also, will this impair the vehicle in any way and does it void warranty?

    Thanks,
    Mike
     
  2. eagle33199

    eagle33199 Platinum Member

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    Location:
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    Vehicle:
    2015 Prius v wagon
    Model:
    Two
    I'll try to answer the questions here:

    First, the battery is located in the trunk, under the passenger side cubby. To get at it, lift up the floorboard flap thingy (as though you were goign to get the spare tire), then pull out the cover over the battery.

    I believe there's also a way to disconnect the battery at the fuse box, but have never done that myself.

    I can't see how replacing a horn will impair a vehicle in anyway, and know a few people on the boards have replaced the horn with something else.

    There's really no such thing as "voiding the warrenty". Modifications you make may void parts of the warrenty, as they don't support modifications. But it's up to them to prove that the modification caused the part to fail. For example, if something goes wrong with the bladder or fuel pump or something, it would still fall under the warrenty. But if the relay for the new horn catches on fire and burns out the fusebox, well you're on your own.
     
  3. FL Buckeye

    FL Buckeye Member

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    Vehicle:
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    The factory horns are powered through a relay so, unless your new horns pull more current, you shouldn't need to use the relay supplied with the new horns.
     
  4. ttabbal

    ttabbal New Member

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    I put one of those Stebel horns on my motorcycle, that thing makes a racket! However, people do notice it. The Stebel is rated to draw 18A, so check to make sure the Prius horn relay can handle that current and if it can, just patch it in. If it can't use the horn wires to trigger your relay, get +12 from the engine compartment and ground the other side of the horn and you're up and running. Note that the horn has polarity markings near the terminals, I don't know how critical it is to obey them, but I did anyway.
     
  5. mi56598

    mi56598 Junior Member

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    Thanks everyone, I will see what I can come up with. It should not be too difficult, I've installed on other cars, just very cautious since the prius is not your everyday type of vehicle.

    <div class='quotetop'>QUOTE(ttabbal @ Oct 31 2006, 10:40 AM) [snapback]341236[/snapback]</div>
     
  6. Tom_06

    Tom_06 Active Member

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    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    <div class='quotetop'>QUOTE(ttabbal @ Oct 31 2006, 10:40 AM) [snapback]341236[/snapback]</div>
    The last time I looked, our OEM horns were on a circuit with a 10A fuse. I expect that is the horns and not the relay.

    - Tom
     
  7. FL Buckeye

    FL Buckeye Member

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    The same 10A fuse supplies both the horn and the horn relay.
     
  8. ttabbal

    ttabbal New Member

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    <div class='quotetop'>QUOTE(FL Buckeye @ Nov 1 2006, 04:55 PM) [snapback]342245[/snapback]</div>

    In that case, DO NOT wire the Stebel directly to the Prius horn wires. At best, you will blow the fuse. At worst, you could fry wiring. Just use the horn wires to trigger a new relay (the Stebel comes with one that will work) and connect a new lead to the 12V screw in the fuse panel. Be sure to use a fuse with it. I used a 30A ATC fuse holder with 12AWG wire for my motorcycle. All bought at the local auto parts store.
     
  9. Fatfenders

    Fatfenders New Member

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    One of the first things I noticed when I got the Prius, was just how pathetic the horn sounded. Today, I went to my local Carquest and pick up a set of A/B horns from them. The horns have the Carquest name on the package, but the horns themselves are marked FIAMM.

    It was a plug-and-play operation and both horns were replaced easily from the top, simply by removing the fasteners along the top edge of the grill molding. I followed these instructions: http://www.vfaq.net/mods/Horns.html

    The grill material is very flexible and I used a pieced of dense foam to hold it open so I could work with both hands to mount the horn on the right side. Only had to modify (read: bend) the mounting bracket for right side horn slightly so it would clear the grill and the a/c condensor.

    Sounds like a car now instead of a moped. It was a plug and play upgrade that took about 45 minutes.