Strange cycling noise after brake release

Discussion in 'Gen 4 Prius Technical Discussion' started by Craig L, Apr 5, 2021.

Tags:
  1. Craig L

    Craig L New Member

    Joined:
    Apr 4, 2021
    3
    1
    0
    Location:
    Burns TN
    Vehicle:
    2016 Prius
    Model:
    Three Touring
    I have a 2016 3 Touring with approx 89k miles. Just noticed (heard) yesterday that when releasing the brake pedal at anytime (Doesn't matter if moving or in gear or neutral) I get an electrical cycling sound for about 3-5 seconds that sounds like it is coming from under the front left grill. Applying the brake pedal cancels it and then all I hear is the regular clicking in the back brakes. I've got about 300k miles driving Priuses and I've never heard this sound.
     
    #1 Craig L, Apr 5, 2021
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    93,150
    42,213
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    can you post a video?

    does it sound like the pedestrian warning system?

    is it a buzzing sound like the brake accumulator?
     
    #2 bisco, Apr 5, 2021
  3. Craig L

    Craig L New Member

    Joined:
    Apr 4, 2021
    3
    1
    0
    Location:
    Burns TN
    Vehicle:
    2016 Prius
    Model:
    Three Touring
     
    #3 Craig L, Apr 5, 2021
  4. Craig L

    Craig L New Member

    Joined:
    Apr 4, 2021
    3
    1
    0
    Location:
    Burns TN
    Vehicle:
    2016 Prius
    Model:
    Three Touring
    yeah sorry, had to figure out how to do the video.
    I just uploaded a video, hopefully it helps. I don't believe it to be part of the ped warning system because friends of ours that always comment on how quiet the car is were the first to notice the sound and alert me. I'm the original owner.

    Thanks
     
    #4 Craig L, Apr 5, 2021
    bisco likes this.
  5. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    93,150
    42,213
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    good job recording.
    yep, that''s the pedestrian warning system. not sure why you never heard it before.

    the volume is adjustable, maybe someone bumped it. you can find it in the o/m.
     
    #5 bisco, Apr 5, 2021
    FuelMiser likes this.
  6. FuelMiser

    FuelMiser Senior Member

    Joined:
    Jun 29, 2008
    972
    686
    0
    Location:
    Monument, CO
    Vehicle:
    2016 Prius
    Model:
    Touring
    bisco nailed it. Sounds just like our '16 Three Touring. At the end of the recording, you actually hear the brake booster/accumulator pump just before the pedestrian warning comes on for the last time.
     
    #6 FuelMiser, Apr 6, 2021
    bisco likes this.
(You must log in or sign up to post here.)
Loading...
Similar Threads - Strange cycling noise
  1. douson

    Toyota Prius 2018 (strange headlight)

    douson, Dec 21, 2020, in forum: Gen 4 Prius Technical Discussion
    Replies:
    6
    Views:
    1,247
    douson
    Dec 23, 2020
  2. John Kuhn

    Will there be issues with more battery cycles, and short cycling engine?

    John Kuhn, Oct 19, 2017, in forum: Gen 4 Prius Technical Discussion
    Replies:
    7
    Views:
    2,665
    bisco
    Oct 20, 2017
  3. Asifpop

    Strange clunk noise from rear

    Asifpop, Sep 16, 2017, in forum: Gen 4 Prius Technical Discussion
    Replies:
    12
    Views:
    8,760
    Ken_Prius4
    Jan 5, 2019
  4. Greg_FR

    Strange noises when using the steering wheel after restart

    Greg_FR, Jun 25, 2017, in forum: Gen 4 Prius Technical Discussion
    Replies:
    30
    Views:
    11,685
    Vali
    Jul 4, 2021
  5. GreenJuice

    Avoided warm-up cycle after overnight park

    GreenJuice, May 19, 2017, in forum: Gen 4 Prius Technical Discussion
    Replies:
    27
    Views:
    13,119
    alanclarkeau
    Jan 29, 2021