2010 Prius Intermittent Front Wiper Problem, works when pushed

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Shamrock2012, Jan 12, 2019.

  1. Shamrock2012

    Shamrock2012 New Member

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    II
    the wipers on my 2010 Prius starting having issues working only on the highest setting at random, sometimes stopping in the middle of the windshield. The wipers will operate if I physically push the wipers back and forth a few times, once they are running they seem to work until I cycle power or change the setting off and on.

    Seeing other user's post's, I checked the fuse and then replaced the wiper switch to see if that would help and it did not. The wipers only work intermittently on the highest setting of the switch.

    Any ideas? Anything I can try before getting a new motor? Is that what I even need?
     
  2. tankyuong

    tankyuong Active Member

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    Sounds like a weak motor
     
  3. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    It's the switch contacts in the wiper transmission. Almost every car on the road does this the same way- the wiper power is routed through the stalk switch, and wired in parallel to a secondary switch inside the wiper transmission. That second switch is open when the wipers are at the full-down park position, and it closes when the wipers are in any other position. This way you get automatic wiper parking.

    The switch inside your wiper transmission has worn or broken. I haven't tried to repair a toyota wiper assembly, but generally speaking they aren't worth it. Much easier just to replace the assembly with a used one from a junkyard.

    It's an integrated assembly that includes the motor, usually looks like this:

    [​IMG]
    (general reference only; not a toyota part)

    In this example the transmission is the black plastic box in the middle, but the junkyard would almost certainly deal with it as a complete assembly as pictured.
     
    Robert Holt, Raytheeagle and JC91006 like this.
  4. Shamrock2012

    Shamrock2012 New Member

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    II
    Thanks, the strength is very weak and I put new wiper blades that was relatively sticky and harder to push.

    If put the blades up removing all contact with the windshield, the wipers do move on all settings(if I’m not mistaken)

    Still look like I need new assembly with motor? I ordered a used one off eBay.
     
  5. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    Two
    They'll work when they're free up in the air because there is enough inertia in the assembly to re-close the internal parking switch. The delicate "make or break" balance is shifted towards "make." When the wipers are on the glass, there's too much drag. Sometimes you'll see a difference depending on whether the glass is wet or dry- the water lubricates the blades.

    Still needs the same fix.
     
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