2010 Prius - Rear Window Defrost Inop

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Eric Smallwood, Dec 20, 2025 at 9:24 PM.

  1. Eric Smallwood

    Eric Smallwood Junior Member

    Joined:
    Mar 22, 2023
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    Location:
    Lawrenceburg, IN
    Vehicle:
    2010 Prius
    Model:
    IV
    When pushing the button, no light. Not working at all. Any ideas?
     
    #1 Eric Smallwood, Dec 20, 2025 at 9:24 PM
  2. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
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    Location:
    Canada
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    Do the mirrors heated up? That way you can tell if it's the switch itself or the rear defroster wires.
     
    #2 Tideland Prius, Dec 21, 2025 at 2:29 AM
  3. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
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    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    He wire or lug disconnected so y cause no light I don't believe . Just no heat . Usually in my stuff the adhesive has loosened at one of two lugs on back glass . Atom adhesives is the glue . Course on a gen3 i do not know . 8 have this lug issue right now on two gen2 on site mirrors work back glass no we have MFD no ligh I think on hen2
     
    #3 Tombukt2, Dec 21, 2025 at 7:42 AM
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