Is the humming noise from the front normal?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by CharlieShen, Oct 19, 2012.

  1. CharlieShen

    CharlieShen New Member

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    I can hear a strange noise from the front occasionally, independent to my operation. It sound like rolling a cassette tape in a old driver. The sound repeats every several minutes, and lasts about 5 seconds each time.

    When I standing outside the car, it hears louder from under the bonnet.

    Is this a normal noise coming from hybrid system?

    Thanks.
     
    #1 CharlieShen, Oct 19, 2012
  2. nh7o

    nh7o Off grid since 1980

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    I wonder if you are hearing the brake actuator pump running, which does occur at somewhat random intervals, but is definitely associated with brake pedal use. Is it the same sound that you hear while parked, when you step on the brake pedal prior to pushing the start button to put the car into ready mode? Sometimes opening the driver side door will cause it to run. If so, then it is normal.
     
    #2 nh7o, Oct 19, 2012
  3. CharlieShen

    CharlieShen New Member

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    Thanks. I will try after a while. But I am sure at lease this sound is really easy to be heard during the start. Does the sound you described happen every time when I press the brake and push the "Start/Stop" button?
     
    #3 CharlieShen, Oct 20, 2012
  4. nh7o

    nh7o Off grid since 1980

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    Yes. (from a cold start)
     
    #4 nh7o, Oct 20, 2012
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