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Ignition Fuse

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by mjoo, May 30, 2017.

  1. mjoo

    mjoo Senior Member

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    Hello Everyone,

    I'm new to hybrids and am ready to do my first maintenance. I'll disconnect the hybrid battery by pulling the orange jumper. Is there an easier way to disconnect the 12V battery than disconnecting the terminals?
     
    #1 mjoo, May 30, 2017
    Last edited: May 30, 2017
  2. bisco

    bisco cookie crumbler

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    sorry, no idea. what maintenance are you doing?
     
    #2 bisco, May 30, 2017
  3. mjoo

    mjoo Senior Member

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    engine coolant and inverter coolant changes. Removing and cleaning the EGR, EGR cooler, intake manifold, throttle body, MAF sensor. Checking spark plugs. Adding an oil catch can.

    The maintenance will take at least a week or two and I'm planning on keeping a charger on the 12V battery
     
    #3 mjoo, May 30, 2017
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  4. bisco

    bisco cookie crumbler

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    i think it used to be the dome light fuse in the gen 2, not sure about gen 3. you could always pull the orange safety plug on the hybrid battery.
     
    #4 bisco, May 30, 2017
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  5. ChapmanF

    ChapmanF Senior Member

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    Doesn't look like anything you're planning would require disconnecting either battery. Just don't chew on any orange cables while doing the work. Might just make sure both batteries are at a relatively high state of charge before beginning the week of work. Has your 12 volt been seeming to lose any significant amount of charge over a week?

    -Chap
     
    #5 ChapmanF, May 30, 2017
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  6. mjoo

    mjoo Senior Member

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    That's a good question and something on the back of my mind...
     
    #6 mjoo, May 30, 2017
  7. mjoo

    mjoo Senior Member

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    Thanks for bearing with my newbie questions.

    With the traction battery disconnected, I'm assuming this prevents the motor from turning? Will this also prevent the spark plugs from firing and the fuel pump from operating or is it prudent to also disconnect the 12V battery?
     
    #7 mjoo, May 31, 2017
  8. ChapmanF

    ChapmanF Senior Member

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    You're not going to have the car in READY while you're working on it, are you?

    None of that stuff will happen if the car's not in READY.

    -Chap
     
    #8 ChapmanF, May 31, 2017
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  9. Shaun_Collins

    Shaun_Collins Junior Member

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    The only thing you should be concerned about doing the msintenance you describe besides shorting the large orange wires is ever doing work in the brakes involving calipers and or wheel cylinders & brake fluid as the electric brake booster pump runs off the Aux 12v battery and can run on its own accord if sensors tell the controller pressure is low & cause severe problems so in that case pull the (I think IIRC) it Is a 30amp brake relay.

    However pulling the HV Traction battery orange fuseable link is a best practice you should exercise.
    LG-H918 ?
     
    #9 Shaun_Collins, Jun 1, 2017
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