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06 Prius horn not working in warm weather

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by jm98, Jun 11, 2017.

  1. jm98

    jm98 Member

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    Location:
    Texas
    Vehicle:
    2006 Prius
    Model:
    Four Touring
    My Prius exhibits a common issue of horn not functioning in warm weather. It has worked in winter months. I understand there is a spring I need to check. Can someone share a picture or diagram where to look for loose contacts including spring?
     
    #1 jm98, Jun 11, 2017
  2. xliderider

    xliderider Senior Member

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    Vehicle:
    2011 Prius
    Model:
    Three
    Spring? Maybe a relay, or check the wiring harness terminals that connects to the horn(s) for corrosion.

    If the Gen 2 has two horns like the Gen 3, and both don't work, it's probably a relay.
     
    #2 xliderider, Jun 11, 2017
    Raytheeagle likes this.
  3. andrewclaus

    andrewclaus Active Member

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    Probably talking about the clockspring, also called the spiral cable.

    Look in "The File Library" section of this forum for wiring diagrams.

    If other steering wheel buttons don't work, it's the clockspring. Otherwise it's probably a relay or fuse.
     
    #3 andrewclaus, Jun 11, 2017
  4. jm98

    jm98 Member

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    Location:
    Texas
    Vehicle:
    2006 Prius
    Model:
    Four Touring
    Steering wheel controls work fine and horn seems to work in winter. Horn has not worked in last three summer months so some contact coming loose in hot summer weather.

    I will check relay and fuse.
     
    #4 jm98, Jun 11, 2017
  5. Kevin_Denver

    Kevin_Denver Active Member

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    Vehicle:
    2009 Prius
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    N/A
    Have you tried rotating the wheel and trying the horn at every position? My horn was only working when the steering wheel was rotated 90 degrees. Replacing the clock spring solved the problem. If the horn works at some positions but not others it's almost certainly the clock spring. All of the other steering wheel controls may also be affected, so I would try them as well (climate, audio, cruise control).
     
    #5 Kevin_Denver, Jun 11, 2017
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