Brake warning buzzer

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Foxhole305, Nov 17, 2018.

  1. Foxhole305

    Foxhole305 New Member

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    I have an 04 prius i bought over the summer. The 12 volt battery died on the car. I replaced the battery and now the brake buzzer sounds every time you touch the break pedal. I didn't have any problems with this car before the battery died. Now my abs lights on and the brake light. I jumped the number 4 and 13 pins an pulled up the check screen and everything checked out ok and the buzzer went off the first time I tired this. I drove a quarter of a mile the buzzer comes on. I park and pull up check screen everything reads ok a buzzer wont go off. When i replaced the battery i removed the brake power supply box to allow for more work space to get to the battery. I reinstalled everything correctly. The new battery has a full charge. Help
     
    #1 Foxhole305, Nov 17, 2018
    Last edited by a moderator: Nov 18, 2018
  2. exstudent

    exstudent Senior Member

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    1) STOP driving the car.
    2) STOP driving the car.
    3) STOP driving the car.

    4) STOP driving the car. The audible alarm is the failsafe warning. It is there to alert the driver that there is a serious brake issue, as some drivers are visually impaired and ignore the dash warning lights.
    SEE: dash warning lights.
    FEEL: brakes not normal.
    HEAR: "DANGER WILL ROBINSON!"
    Next: CRASH.​

    5) Get the codes read w/ a Prius compatible code reader (ie Techstream software). Bluetooth OBD2 readers using Torque lite/pro will miss many Prius specific codes. Get miniVCI w/ Techstream (Amazon), or goto the Toytoa dealer, or to a shop that has a Prius capable reader.

    6) What is a "check screen"?

    7) What is this?
    You should have only removed the hold down tie, positive clamp, and negative clamp.

    8) The brake booster could have been at the end of its life, just as you changed the 12V battery. An unfortunate coincidence.
     
  3. Patrick Wong

    Patrick Wong DIY Enthusiast

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    1-4) Absolutely.

    5) I agree that the OP needs to have the DTC from the skid control ECU read to have a clue about what is wrong with the braking system.

    7) OP is referring to the bank of capacitors in the black rectangular box next to the 12V battery. It could be that the connection to that box was damaged in the process of installing the 12V battery. If so, that would cause the skid control ECU to have a fit since it no longer has access to the emergency power supply.
     
  4. Mendel Leisk

    Mendel Leisk Titanic Social Director

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    I think OP's reaction is not atypical. Maybe car designers need to rethink their warnings, if the typical reaction is "how to do I turn off this...".

    Maybe part of the problem is the international manufacture: text warnings are more difficult to institute, need translation for every destination country, maybe multiple translations per country.

    A good warning I can think of, is the metal tang on brake pads, that sounds like a tortured cat when the pads are getting low. Hard to ignore.
     
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  5. exstudent

    exstudent Senior Member

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    Add to that sounds of cat(s) in heat coming through the speakers, until repaired. Wanna kill them, as they wake me up.

    I can't see most normal people wanting to put up with that. But, then you'll probably see people driving around w/ ear plugs.
     
    #5 exstudent, Nov 18, 2018
    Last edited: Nov 18, 2018
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