Buzzing noise from engine bay

Discussion in 'Gen 2 Prius Technical Discussion' started by Saz, Aug 25, 2019.

  1. Saz

    Saz New Member

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    So I just got this Prius 170k miles, battery has been replaced. Well on the way home I started getting a buzzing noise. It's on and off at all times even when turned off for about an hour.
    Any ideas?

     
  2. Aegean

    Aegean Junior Member

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    It is the inventer pump. It is normal noise which I hear for 14 years on my Prius. Actually, if I don’t hear it I would start to worry now.
     
  3. ChapmanF

    ChapmanF Senior Member

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    In what Gen 2 does the inverter pump run when the car is off?
     
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  4. audiodave

    audiodave Active Member

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    Sounds like the brake actuator. Not good running all the time. It's not going to last.
    Posted via the PriusChat mobile app.
     
  5. bisco

    bisco cookie crumbler

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    congrats and welcome!

    probably the brake accumulator, which you'll hear when you open the drivers door or step on the brake. if the frequency keeps increasing, that could be impending failure.

    but listening to the video, i've never heard that sound, i wouldn't describe it as buzzing
     
  6. Saz

    Saz New Member

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    Thank you for the replies! After quite a bit of looking around and with the help of a buddy, we replaced the brake accumulator. Went to reset all the warning lights pretty much lit up like a Christmas tree. Even the fuel isn't reading correctly. Says flashing in E when it has almost a full tank. Followed instructions on how to reset them and it's not working.
    So with a jumper pin in fourth from the left(top) and fourth from the right (bottom) I push brakes turn on, and press brakes 8 times within 5s (meanwhile the diagnostic mode comes up on the display). Then hold brake and turn off. Remove pin, and restart like normal. Nothing happens when I do this. Tried about 7 or 8 times.
    Oh God. I hope I didn't mess anything up replacing the brake accumulator. I marked everything during the replacement to not F anything up and it was very straightforward.

    Any thoughts?
     
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  7. bisco

    bisco cookie crumbler

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    maybe time for tech stream?
     
  8. Saz

    Saz New Member

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    Just bought techstream. But before doing anything on it I figured I missed something.. opened up the inverter and everything was perfect. Went to put the service plug back in and realized that my dumb nice person self hadn't locked the plug in previously. (The slide down part). Reset the warning lights now I'm about to bleed the brakes. I can't believe I did that.
     
  9. Saz

    Saz New Member

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    Also - I love the autocorrect for Prius forums lol. I wrote my dumb a self and it made it nicer
     
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