AC light is Always lit/on

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by priinoob, Sep 16, 2023.

  1. priinoob

    priinoob Junior Member

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    Hello folks. So I have this issue with AC button is always lit. When I press it to disable or to switch the regular fan nothing happens. I can turn it off completely with OFF button but whenever I use fan buttons it always lits the AC led even when it’s not in defrost or floor mods. What might be causing this issue? I tried generic troubleshooting with holding down two buttons to see if I get any codes based on this video:
    .
    AC works fine when it comes to cooling or heating but I don’t understand why it wouldn’t switch to regular fan mode. I tried to hold it down, wiggle it to see if the button is stucked but did not help.
    There is also no lights on the dashboard.
    I appreciate any help.
     
  2. bisco

    bisco cookie crumbler

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    is the compressor always on when the button is lit?
     
  3. priinoob

    priinoob Junior Member

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    I’m not sure where to look :/
     
  4. bisco

    bisco cookie crumbler

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    looks like the lower front left around 4:30, but you really don't need to see it, it makes a pretty loud buzzing noise, especially after the engine shuts down:

    search
     
  5. priinoob

    priinoob Junior Member

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    It’s not always on. Loud buzzing noise is gone after a minute or two.
     
  6. bisco

    bisco cookie crumbler

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    well, at least you know it's just the light and not the compressor.

    i guess you'd have to trace the schematic at techinfo.toyota.com
     
  7. priinoob

    priinoob Junior Member

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    at this point i’ll just ignore and use ac heating in winter. is it bad idea?
     
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  8. bisco

    bisco cookie crumbler

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    Not at all, that should work fine
     
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