A/C Compressor relay

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Lewielewie, Jun 15, 2016.

  1. Lewielewie

    Lewielewie New Member

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    Just less than year ago, dealer replaced all my A/C parts except compressor. Now A/C out again, refrigerant level fine per local mechanic, but no variation from baseline pressures when start A/C, which just blows warm air. Mechanic thinks compressor not working. Before I go to dealer, would like to check relay to compressor isn't bad. Can anyone tell me what it's labeled on diagram under lid of fuse box/relay compartment, or better yet, send picture of that compartment with arrow drawn to the correct relay?

    Thanks, Lew
     
  2. ChapmanF

    ChapmanF Senior Member

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    In your 2006 you would be looking a long time for a compressor relay. :) Your compressor is not driven by a belt and electric clutch, it's driven by its very own, high voltage, three phase electric motor, which is driven at variable speeds by three-phase AC waveforms fed to it from the inverter assembly, under orders from the HVAC computer in the dash.

    There are some pricey parts in that picture, so you probably don't want to pursue the old "replace things until I get lucky" repair strategy. In the new era, to troubleshoot the way God and Toyota intended, you would ask the HVAC computer to tell you what the trouble is, and then fix that.

    In a 2006, starting with the power off, hold down both the 'auto' and 'recirc' steering wheel buttons, while you turn the car on (two POWER presses without touching the brake) ... or READY (one POWER press, while pressing the brake). Wait for a beep and the multifunction display switching to the climate screen. Note down any two-digit numbers shown in the top right corner. These can be looked up in the repair manual.

    I said ON or READY because I don't think it really matters ... I've seen a post that says to use READY, I know just ON works on my Gen 3 (and is what the manual says), I think you get the same codes either way. :)

    -Chap
     
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  3. Lewielewie

    Lewielewie New Member

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    Thanks, Chap. Did that procedure, and got "21" code back, although found it in middle between up and down arrows for setting temp on Climate screen, alternating with current temp setting (76). (Upper right of screen just had current outside temp).

    I obviously need a repair manual, but don't have one. Can you tell me which one is best to get, and where to order it? And in meantime, if you are able to find that code in your manual and tell me what it means, or if it's possible to find that out online, I'd be very grateful--although am certainly very grateful to you already!

    All the best,

    Lewis
     
  4. Lewielewie

    Lewielewie New Member

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    Found manual online, but can't seem to find "21" as a diagnostic code. ??
     
  5. ChapmanF

    ChapmanF Senior Member

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    Sorry, didn't see this right away. Pretty sure 21 is the code for solar sensor in the dark. Not a problem if you actually are in dark or shade when you ask for codes. Only indicates a problem if still shown even when sunlight is falling on the sensor.

    But I strongly recommend checking the manual rather than trusting my memory on codes.

    So, if that was the only code shown, then whatever other problems exist will have to be tracked down the hard way.

    -Chap
     
  6. ILuvMyPriusToo

    ILuvMyPriusToo Active Member

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    While there isn't a relay, there should be a fuse somewhere that would be worth checking. Surprising the ECU didn't give you a trouble code. Maybe more info would be available over a miniVCI check of that ECU.
     
  7. ChapmanF

    ChapmanF Senior Member

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    The high-voltage system has very few discrete, replaceable fuses, as far as I know ... I'm not aware of any, other than the main one that's co-located with the orange service disconnect at the traction battery.

    -Chap
     
  8. b100

    b100 Member

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    There is a ac fuse inside the inverter.
     
  9. Gregory kitchens

    Gregory kitchens New Member

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    I know this is an old thread but on my 04 model my a.c. doesn't work. I get codes
    00, 13, 62 and 74. The copressor doesn' cycle at all, and it reads over pressure on the low side and it does not change when I turn the a.c. on, nor do I see anything in the sight glass. I' assuming the amplifir is out, but it' also throwing 74 so I'm not surem I made a post, but since I just registered (finally) it's still waiting admin approval and has been for a few hours.
     
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  10. Qwer

    Qwer New Member

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