Question about 2001 Toyota Prius

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Finding bad cell in hv system. How do I remove the rear seat. After the service plug do you diconnect the cells from the busbsr and test them one at a time.

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  • Toyota Master
  • 1,861 Answers

Hello. Welcome to FixYa.

I am a Toyota Service Manager, with all of the necessary Prius credentials..

I would seriously recommend that you do NOT fool with the HV battery, or anything inside the HV battery's protective case. Even with the service plug disconnected, you are dealing with potentially LETHAL voltages. 303 volts DC, to be exact. So, touching the wrong terminal at the wrong time could send those 303 volts across your heart, and that voltage is more than sufficient enough to stop your heart.

Plus, if you do find a bad cell, individual replacement cells are not available; you must obtain the entire HV battery.

In short, PLEASE stop what you are doing. You are taking a great risk.
If you do not have the in-depth knowledge with regard to proper handling of the HV battery, you are headed for a potential disaster.

Posted on Oct 02, 2009

  • test815 Oct 10, 2010

    Working with the HV is dangerous, however, it is less dangerous than home electricity. After reading all the scary nascence on the web and downloading the tech manuals, I decided I have worked enough with electricity to know what safe and when to stop. Do not touch any thing that is orange until you have the HV housing disassembled and the buss (which harnesses the power from the models) disconnected. Use electric tools with good insulation and do not coincidentally short any wires. A combination of common sense, electrical repairs knowledge and respect to HV electricity are essential. I am a DIY, without any official training.

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