2005 prius will not start but 12v battery seems to be working

Discussion in 'Gen 2 Prius Technical Discussion' started by geo2000, Dec 22, 2019.

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  1. geo2000

    geo2000 New Member

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    Also where is the power source ecu located?
     
    #41 geo2000, Dec 29, 2019
  2. geo2000

    geo2000 New Member

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    Also I am planning to go to pick and pull to get a used power button.
     
    #42 geo2000, Dec 29, 2019
  3. TMR-JWAP

    TMR-JWAP Senior Member

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    The Power Source Control ECU appears to be mounted behind the dash, just under the combination meter, against the firewall.

    As to what, if any voltages should be present at the switch pins, I don't know at this moment. It would be fairly easy to check continuity of the switch contacts though. That would at least let you know if the switch was functioning.

    It may be worth checking that harness connector at the switch just to make sure it isn't loose. Even if it's not, you may want to reseat it. Stranger thangs have happened.
     
    #43 TMR-JWAP, Dec 29, 2019
  4. SFO

    SFO Senior Member

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    #44 SFO, Dec 30, 2019
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  5. geo2000

    geo2000 New Member

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    TMR-JWAP I purchased power switch from pick and pull still not working. It is like no power is coming to the power switch from the fuse box from the driver side. I checked ig1 relay and it is working. Question: Are the 7.5A ECU-ig fuse and 10A gauge fuse suppose to be hot--constantly on? Just wondering.
     
    #45 geo2000, Dec 31, 2019
  6. geo2000

    geo2000 New Member

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    Also is there a way to check ig2 relay? That is really hard to get to.
     
    #46 geo2000, Dec 31, 2019
  7. TMR-JWAP

    TMR-JWAP Senior Member

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    Read through this attachment, page 13 has a chart...kind of leads one to the power source control ecu.
    Just give it a good look before jumping in too deep.
     

    Attached Files:

    #47 TMR-JWAP, Dec 31, 2019
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  8. geo2000

    geo2000 New Member

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    Thanks for all your help TMR-JWAP. I will let you know the results.
     
    #48 geo2000, Jan 3, 2020
  9. geo2000

    geo2000 New Member

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    Hallelujah! The prius is finally working again! In short, the problem was the power source control ecu. I went to pick and pull car yard and purchased another power source control ecu off another 2005 prius for $8.00 and it works! I want to thank TMR-JWAP for his patience and guidance for helping me through my car problem. I appreciate the attachment you gave me. It was extremely helpful. I will keep you in mind when I run into other prius issues. Take care!
     
    #49 geo2000, Jan 4, 2020
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  10. SuperDave

    SuperDave Member

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    Geo Where you able to replace the ECU from under the dash or did you have to remove the dash to get to it?
     
    #50 SuperDave, Feb 19, 2020
  11. christian cox

    christian cox Member

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    What and where is the power source control ecu ??
     
    #51 christian cox, Apr 14, 2022
  12. TMR-JWAP

    TMR-JWAP Senior Member

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    Look at the attachment in post 47. Second page has a diagram and shows it's location.
     
    #52 TMR-JWAP, Apr 14, 2022
  13. Xaoh

    Xaoh New Member

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    Thanks just read this, I’ll go buy a power control ecu, it seems these codes lead to this !
     
    #53 Xaoh, Mar 16, 2023
  14. edthefox5

    edthefox5 Senior Member

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    If you have a key icon on the dash when you try to start the car that means the car is not detecting the fob. You have a bad fob.
     
    #54 edthefox5, Mar 27, 2023
  15. wirelessjava

    wirelessjava Member

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    I find that AAA batteries go downhill after 2 years but getting the Toyota OEM 85 months battery is worth the headache than wasting your MONEY on lesser batttries
     
    #55 wirelessjava, Aug 12, 2023
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