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B1475 a/c Inverter intermittent failure?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Matt Wooten, Aug 25, 2021.

  1. Matt Wooten

    Matt Wooten New Member

    Joined:
    Aug 25, 2021
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    Location:
    Jonesborough, TN
    Vehicle:
    2008 Prius
    Model:
    Base
    Hi.
    I had my a/c start blowing heat today while set at 65F all of a sudden (blower moving normal amount of air, just went from cold to hot in a matter of minutes during a drive). On inspection I discovered that my a/c compressor was not running with a/c in the on position and cooling fans were not running either. I held down steering wheel buttons for a/c auto and recirc. and power button to check codes and came up with 21 and 75 (B1475). I have no check engine light or “triangle of death”, but borrowed a obd2 scan tool from the local parts store anyway. It said there were no current or stored codes. Toyota diagnosis flow chart seems to indicate that I need to replace the entire inverter assy. However, after letting the car cool, I restarted and now have working cold a/c again. After that I immediately discovered that my inverter coolant pump is not running at all. Any thoughts? Why no code or warning for the inverter coolant pump? What are the odds that the inverter is OK, and maybe the only issue is that the inverter overheated enough to shut off the a/c compressor, but not damage the coolant temp sensor in the inverter or the inverter itself? It seems to be running and charging normally. This just happened today, but I have no idea how long the inverter coolant pump has not been running. Thanks for your time and any thoughts or info!
     
  2. dolj

    dolj Senior Member

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    Location:
    Wellington, New Zealand
    Vehicle:
    2007 Prius
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    Replace the failed pump.
    Because there isn't one.
    Pretty high, and if the car works normally when you let it cool down, it should be fine after you change the inverter cooling pump.
    Probably quite a while especially if has been fairly cool prior to now.
     
  3. mr_guy_mann

    mr_guy_mann Senior Member

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    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    Replace the inverter pump (with a Toyota part from a reputable source) and it should be fine.

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