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Strange sound i cant explain

Discussion in 'Hybrid General Discussion' started by varycoolman579, Jan 30, 2014.

  1. dnt1010

    dnt1010 Full Access Member

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    This same thing started on my 2009 Hybrid about a week ago (217k miles) first noticed a loud buzzing noise in the rear speakers when hitting the brakes, radio was still working normally and no other symptoms, just a loud buzzing fom the rear speakers. I turned the radio off and on a few times and it stopped, then a few days later when using the blinker it did it again. Seems like it is something to do with with the exterior lighting (brake lights and blinker) If it keeps doing it I will be able to gather more information. This Hybrid has the Bose system with rear radio controls and DVD system. I do haul around 3 young kids and they are always fiddling with rear controls so maybe they have done something just not sure what it could be? Not a major issue but very annoying.
     
  2. BG1988

    BG1988 Full Access Member

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    mine makes the buzzing sound on a very specific song
    on the CD I just skip that song on it
     
  3. BG1988

    BG1988 Full Access Member

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    i would check the ground wires honestly it sounds like a "open or high impedance ground" and it found a "path via the speakers" this can cause an electrical fire if too much current was to take this path... the least you will have blown speakers and a broken headunit and the worst being a fire and no brakes...( don't panic of you lose them Remember Shift in to engine braking will be above M4 "45mph" m3 "35mph" m2 "25mph" m1 "10mph" regen and your ebrake will bring you to a stop )

    the speakers tend to be a low impedance path 2-8 ohms

    2 or 4ohms is typical..



    or it's interference from poor ground connection


    you know check the battery terminal
    the engine block (the cable the connects to the battery) and from the rear of the engine to the chassis and the inverter from the chassis to the inverter (it's a real beefy cable , a bare cable it's just right below the inverter )



    See all these dirty ground connections :( the impedance is so high it has no issue draining the battery in about 4 days

    20191118_115023.jpg 20191118_114931.jpg 20191118_114732.jpg 20191118_114725.jpg
     
  4. BG1988

    BG1988 Full Access Member

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    it could be the aspirator fan above you that thing makes buzzing noise

     
  5. BG1988

    BG1988 Full Access Member

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    this hum you speak of might also be coming from the transmission Aux pump it uses a 3 Phase 12 volt AC motor and the radio might be picking up the 60Hz buzz from it.


    and since the radio is technically is always "on" it will emit the sound ..

    More then likely it's the 12volt 3 phase AC motor apparently it's Tied into the 12V DC system from what i have read... :D


    which is why one would need a VERY strong 12volt battery to run this machine...sure that AUX pump pulls quite a bit of power... estimated about 0.7-1.2KW?(based on the 8awg wire) i would assume it's closer to 0.7kw as that would be 28-30% of the inverter 12v output..
     
    Last edited: Dec 9, 2019
  6. dnt1010

    dnt1010 Full Access Member

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    I forgot to post back the FIX. One of the kids had hung the knob on the rear radio control with their back pack strap and damaged the rear control I replaced the entire unit (amazon about 100 bones) and all fixed now. If you do a thorough search there are several people that figured this out over time. Amazon has plenty of the replacements Git U 1
     
    Galante likes this.

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