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Install louder horn and separate button on the steering wheel

Discussion in 'Gen 2 Prius Accessories & Modifications' started by Troy DIY, Sep 13, 2023.

  1. Troy DIY

    Troy DIY New Member

    Joined:
    Sep 12, 2023
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    Location:
    Fort Lauderdale FL
    Vehicle:
    2007 Prius
    Model:
    II
    This is my first post and I have learned much over the past few months here.

    The 2007 Prius horn is wimpy and I bought a high low air horn to add and not to replace the existing one. I could install a momentary switch on the dash panel but want to have quick access to the button. My steering wheel controls has an empty section because I don’t have the navigation and handsfree phone option. I recently replaced the clock spring and realize there are unused path ways.

    Are there diagrams that shows the wheel side and column side pin outs for the connectors? If none exists then I’ll use a multimeter to test for open unused pathways.

    Thanks!
     
    #1 Troy DIY, Sep 13, 2023
    douglasjre likes this.
  2. bisco

    bisco cookie crumbler

    Joined:
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    #2 bisco, Sep 13, 2023
  3. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
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    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Welcome to PriusChat!!
    There are digital copies posted in the forum, and some members will host or send them as well. The advanced search feature works.

    Try this : https://priuschat.com/attachments/prius-wiring-pdf.33780/
    If you do test, please post anything learned.

    Please use this thread to document this mod so that others can learn, and include lots of pictures, as everyone loves those.

    FYI : you're moderated until you've posted 5 times.
     
    #3 SFO, Sep 13, 2023
  4. Primetime Paul

    Primetime Paul Junior Member

    Joined:
    Aug 7, 2023
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    Location:
    San Diego, CA
    Vehicle:
    2006 Prius
    Model:
    N/A
    Tap into the existing horn connection with a 4 pin relay. I did this on my motorcycle with a Stebel Nautilus air horn. Works great and no codes.


    Pixel 7 Pro ?
     
    #4 Primetime Paul, Sep 28, 2023
  5. douglasjre

    douglasjre Senior Member

    Joined:
    Sep 13, 2008
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    Location:
    Null, NL
    Vehicle:
    2010 Prius
    Model:
    ----USA----
    I've never had a horn prevent a collision but I like it. I want a train horn for mine
     
    #5 douglasjre, Sep 28, 2023
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