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I might need a new ECU, from Installing LED mirror Turn signals

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Jwb2781, Oct 14, 2013.

  1. Jwb2781

    Jwb2781 Junior Member

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    So I had LED mirror turn signals installed when the car had 1000 miles(2011 model bought brand new in 2012), now the car has 15000 miles, and the battery died two days in a row. I took it into the Toyota dealership, and they say the car is not covered because of the aftermarket add-ons. They said the dome light stays on and is causing the battery to drain. I don't want to spend $600+ to fix this and I can't take it back to the shop because it's been more then a year since the work was done...no warranty....what shall I do?
     
    #1 Jwb2781, Oct 14, 2013
  2. toyotechwv

    toyotechwv Toyota Technician

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    Ok maybe I'm missing it but what ecu is bad supposedly?

    SPH-D710 ? 2
     
    #2 toyotechwv, Oct 14, 2013
  3. Jwb2781

    Jwb2781 Junior Member

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    I assume it's the main ecu....or the ecu that the turn signals, dome light, and the radio are plugged into.
     
    #3 Jwb2781, Oct 14, 2013
  4. toyotechwv

    toyotechwv Toyota Technician

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    I would seriously doubt it's an ecu problem.

    SPH-D710 ? 2
     
    #4 toyotechwv, Oct 14, 2013
    sprtent likes this.
  5. toyotechwv

    toyotechwv Toyota Technician

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    Does the dome light stay on regardless of switch position?

    SPH-D710 ? 2
     
    #5 toyotechwv, Oct 14, 2013
  6. Jwb2781

    Jwb2781 Junior Member

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    Yes, the dome light stays on regardless of the switch position. :-/
     
    #6 Jwb2781, Oct 14, 2013
  7. drysider

    drysider Active Member

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    Take the bulbs out until you figure out how the wiring is messed up. Sounds like the LED's were hooked to the wrong switch terminal.
     
    #7 drysider, Oct 14, 2013
  8. Jwb2781

    Jwb2781 Junior Member

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    That's my plan...a little bummed that it's fall/winter and it gets dark so I will be entering a dark car.
     
    #8 Jwb2781, Oct 14, 2013
    drysider likes this.
  9. toyotechwv

    toyotechwv Toyota Technician

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    Where are the mirrors wired in? Can you get me a pic?

    SPH-D710 ? 2
     
    #9 toyotechwv, Oct 14, 2013
  10. Jwb2781

    Jwb2781 Junior Member

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    I wish I could...I didn't do the install, but I am told by Toyota, that it is done in the door panel, and through the ecu.
     
    #10 Jwb2781, Oct 15, 2013
  11. toyotechwv

    toyotechwv Toyota Technician

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    Can't be in the door panel. They would have had to come out to the fuse box behind the knee pad to access the turn signal circuit. Or atleast to the lower kick panel. Who did the install?

    SPH-D710 ? 2
     
    #11 toyotechwv, Oct 15, 2013
  12. sprtent

    sprtent Member

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    I would read almost through just the first post of this thread of how owners installed the combo side mirrors DIY JDM style side mirrors combo lights (Signal+Parking+Courtesy lights) | PriusChat
    which include the wiring location of the left/right turn signal wires. This should give you at least a general idea of where to start looking for things. In particular, look at pictures # 17 and 18. This is how and where I would tap in in terms of connections of turn signals. There should not be any connection behind the door panel like toyotechwv said. The +/- wires from each LED light should loop through the mirror housing, through the door's main wiring line and into the car. But we don't know how your shop did it.
     
    #12 sprtent, Oct 15, 2013
  13. toyotechwv

    toyotechwv Toyota Technician

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    Reading that thread I see the mirrors tap into the dome light. THAT is likely where your issue is. I would pull the light down and check. If you're remotely near southern WV I'd be happy to check it for you.

    SPH-D710 ? 2
     
    #13 toyotechwv, Oct 15, 2013
  14. Jwb2781

    Jwb2781 Junior Member

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    Thank you for all your help. I got this done at a shop in Everett, WA...yes, they came from the out to the fuse box behind the knee pad to access the turn signal circuit. I noticed a lot of wires there...I may take a photo and upload it. I will check the doom light and see if wires are attached there...where is the ECU that the Toyota dealership is talking about? They said if I can get the wires that are tapped into it off, they will re-look at it for no cost. I would love to have my doom light working again.
     
    #14 Jwb2781, Oct 31, 2013
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