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Running down battery

Discussion in 'Gen 2 Prius Main Forum' started by ekc, Nov 21, 2004.

  1. ekc

    ekc New Member

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    I want to play with my Nav in my new car and try to pre-set a trip. Will I run the little battery down if I just turn accessory power on, or should I have the car running in the driveway? I don't need a dead battery. Thank you.
     
    #1 ekc, Nov 21, 2004
  2. efusco

    efusco Moderator Emeritus
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    I don't think you'll have any problem if you take less than 30-45 minutes. If it'll be longer just put it in IG ON mode and it'll use the HV battery which will have plenty of juice.
     
    #2 efusco, Nov 21, 2004
  3. ekc

    ekc New Member

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    By IG ON, do you mean when you power it up and it says 'ready', as opposed to hitting the power button once without touching the brake peddle?
     
    #3 ekc, Nov 21, 2004
  4. IsrAmeriPrius

    IsrAmeriPrius Progressive Member

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    <div class='quotetop'>QUOTE(ekc\";p=\"51958)</div>
    No. You push the power button twice without pressing the brake pedal. All the systems and accessories will operate, but the engine will not run.
     
    #4 IsrAmeriPrius, Nov 21, 2004
  5. ekc

    ekc New Member

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    As long as I don't touch the brake peddle, I only have to hit the power button once. However, I was wrong...I thought that meant that it was running on the 12 V. Thank you...
     
    #5 ekc, Nov 21, 2004
  6. efusco

    efusco Moderator Emeritus
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    <div class='quotetop'>QUOTE(ekc\";p=\"51979)</div>
    I'm not sure you understand completely...I apologize if you do, but your sentence above makes it sound like you don't.

    No Brake:
    1 Press = ACC mode--12v battery only
    2 Preses= IG ON mode--12v and HV battery, not ready to run the car, but the HV battery will recharge the 12v to run the various equipment that has a higher drain than the 12v alone could handle.

    Brake Pressed=1 Push = Ready mode
     
    #6 efusco, Nov 21, 2004
  7. DanMan32

    DanMan32 Senior Member

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    <div class='quotetop'>QUOTE(efusco\";p=\"52003)</div>
    I'm not sure you understand completely...I apologize if you do, but your sentence above makes it sound like you don't.

    No Brake:
    1 Press = ACC mode--12v battery only
    2 Preses= IG ON mode--12v and HV battery, not ready to run the car, but the HV battery will recharge the 12v to run the various equipment that has a higher drain than the 12v alone could handle.

    Brake Pressed=1 Push = Ready mode[/b][/quote]

    That is incorrect. The HV relays cut off the HV power from the inverter. Only in Ready will the HV provide power to the inverter.
    However, the Battery ECU is operative, so it can get and report the HV battery condition based on the voltages across the packs.
     
    #7 DanMan32, Nov 22, 2004
  8. efusco

    efusco Moderator Emeritus
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    Ok, thanks for the correction DanMan.
     
    #8 efusco, Nov 22, 2004
  9. Gurmail

    Gurmail Member

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    <div class='quotetop'>QUOTE(DanMan32\";p=\"52099)</div>
    I'm not sure you understand completely...I apologize if you do, but your sentence above makes it sound like you don't.

    No Brake:
    1 Press = ACC mode--12v battery only
    2 Preses= IG ON mode--12v and HV battery, not ready to run the car, but the HV battery will recharge the 12v to run the various equipment that has a higher drain than the 12v alone could handle.

    Brake Pressed=1 Push = Ready mode[/b][/quote]

    That is incorrect. The HV relays cut off the HV power from the inverter. Only in Ready will the HV provide power to the inverter.
    However, the Battery ECU is operative, so it can get and report the HV battery condition based on the voltages across the packs.
    [/b][/quote]

    I am not so sure. I hear the same humming from the HSD (under the HSD cover) whether the engine has turned off while stopped in ready mode or if while parked I use IG-ON mode to listen to music etc.
     
    #9 Gurmail, Nov 23, 2004
  10. DanMan32

    DanMan32 Senior Member

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    That noise you are hearing is probably the inverter coolant pump. If you were to put a voltmeter across the 12v supply lines, you would see that it is 12v or less in all modes but Ready, and 14V in Ready. The 14V is from the DC-DC converter charging the 12V battery and providing 12V to the electronics.

    I have examined and read the service manual, and it does indicate the main relays only power up in READY mode.
     
    #10 DanMan32, Nov 24, 2004
  11. ekc

    ekc New Member

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    So, I'm back to 2 presses, no brake, to be sure not to wear the battery down...right??
     
    #11 ekc, Nov 24, 2004
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