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battery FAN problem

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by tomy, Jun 16, 2019.

  1. tomy

    tomy Junior Member

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    hellow, my battery fan work just when connected OBD with hybrid assistant app, if not connected fan is sleep. outside temperature 30C, what is problem can you help?
    and car battery internal resistance is 0.023-0.027ohm its normal?
     
    #1 tomy, Jun 16, 2019
  2. jerrymildred

    jerrymildred Senior Member

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    Sounds normal to me. The fan is controlled by an ecu that is monitoring the battery temperature. How hot is the battery?
     
    #2 jerrymildred, Jun 16, 2019
    Dxta likes this.
  3. Dxta

    Dxta Senior Member

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    As long as you don't see the red triangle light, when you removed the obd2 with the fan "sleeping", the car's ECU would take care of the rest.
    But from the resistance vues, appears the battery is getting hot already.
     
    #3 Dxta, Jun 16, 2019
  4. tomy

    tomy Junior Member

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    Battery temp. Is a 35-41 C
     
    #4 tomy, Jun 16, 2019
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    On my third gen, pretty sure the fan was coming on, maybe speed one or two, around 35C battery temp. It's been a few years since I monitored, so not sure.

    There's some blower motor troubleshooting info in the attached. I've only skimmed, but hopefully will help.
     

    Attached Files:

    #5 Mendel Leisk, Jun 16, 2019
  6. bisco

    bisco cookie crumbler

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    how are you determining if the fan is coming on or not? don't go by sound
     
    #6 bisco, Jun 16, 2019
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