Strange Sound When Backing Up

Discussion in 'Gen 4 Prius Main Forum' started by Colorado Boo, Jul 22, 2021.

  1. Colorado Boo

    Colorado Boo Member

    Joined:
    Jun 23, 2021
    173
    98
    1
    Location:
    Monument, Colorado USA
    Vehicle:
    2021 Prius
    Model:
    LE AWD-e
    I asked AMD (the Car Care Nut on Youtube) about this sound and he told me to get it on video, so I did. It's hard to describe (especially with the stupid backup beep) but kind of sounds like a hum of two thin sheets of metal rubbing together.) Yes, it makes the sound every time I back up.
    Our 2017 Prius makes no sounds like this when backing up, and never has.

    Have a listen....anybody else have this? (It is an AWD car but not sure if that makes a difference.)


     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    93,888
    42,549
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    that's your VPNS vehicle pedestrian notification system. it was adjustable in 2017, now it is required by nhtsa.
    it is on forward and backward up to around 18mph, but the conditions have to be right to hear it inside the car.
    toyota has had it since 2012

    nhtsa was petitioned by the federation for the blind, because they were being killed by prius left and right because they were too quiet.
    the back up beep is for you because toyota drivers are all old and senile, and can't detect which direction they are going
     
    #2 bisco, Jul 22, 2021
    Last edited: Jul 22, 2021
    jerrymildred and Pulse07 like this.
  3. Pulse07

    Pulse07 Member

    Joined:
    Feb 24, 2020
    140
    77
    0
    Location:
    California
    Vehicle:
    2020 Prius
    Model:
    XLE AWD-e
    Thats what I am hearing, its the "HUMM" for pedis unless I am not hearing what you are describing. Set a gopro shoot a video of yourself moving forward and in reverse , you'll hear the hum
     
    jerrymildred likes this.
  4. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    9,911
    12,147
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    Yup! It's the pedestrian warning system. Much louder outside the car on the new ones. My 2017 is almost inaudible on the loudest setting. Gotta make sure the EVs are 10 times louder than the RAM 2500 diesels.
     
    Mambo Dave and alanclarkeau like this.
  5. MIkeDr

    MIkeDr Member

    Joined:
    Sep 16, 2020
    127
    79
    0
    Location:
    Seattle, WA
    Vehicle:
    2020 Prius
    Model:
    XLE AWD-e
    And I think it could be worse. The Honda CR-V hybrid sounds like a chirping robotic bird.
     
  6. Pulse07

    Pulse07 Member

    Joined:
    Feb 24, 2020
    140
    77
    0
    Location:
    California
    Vehicle:
    2020 Prius
    Model:
    XLE AWD-e
    the sound volume can be changed?
     
  7. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    9,911
    12,147
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    Yes if it's previous to the 2021 MY. It's the first item on the customizable feature list in the 2017 owners manual. The manual says a dealer has to do it, but lots of OBDII phone apps will also allow you to change this along with a bunch of other settings.
    Screen Shot 2021-07-24 at 9.56.59 AM.png
     
    Pulse07 likes this.
Loading...