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Need Wiring Diagram/Pinout for Rear Lights

Discussion in 'Gen 3 Prius Technical Discussion' started by Benjamin Goldstein, Sep 1, 2018.

  1. Benjamin Goldstein

    Benjamin Goldstein New Member

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    Vehicle:
    2014 Prius
    Model:
    Two
    The wiring harness for the hitch I purchased is not easily plug and play. I have to manually splice it into the rear lights. The problem is that I have no idea which wires go to the following:
    1. Rear left light
    2. Rear left break light
    3. Rear left blinker
    4. Rear right blinker
    The rear left light wiring harness contains 5 wires colored red, blue, green, brown, and black/white. I believe they correspond to tail light, break light, reverse light, left blinker, and ground/power(?) cable. Any help would be greatly appreciated.
     
    #1 Benjamin Goldstein, Sep 1, 2018
  2. Elektroingenieur

    Elektroingenieur Senior Member

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    Vehicle:
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    As you may know, Toyota recommends against towing with this car (Owner’s Manual (PDF), page 326).

    That said, the Electrical Wiring Diagram is available by subscription to techinfo.toyota.com. See the Stop Light, Taillight, and Turn Signal and Hazard Warning Light pages in the System Circuit section for the wire colors and connector pinouts, and the Location and Routing section for the general location of each connector.

    In brief—and without any analysis of how much additional load (if any) the circuits can support:

    Connector R17, Rear Combination Light Assembly LH
    Connector S18, Rear Combination Light Assembly RH

    Terminal 1 – Brown – Tail/Marker Light
    Terminal 2 – Blue – Stop (Brake) Light
    Terminal 3 – Yellow (Left) or Green (Right) – Turn Signal
    Terminal 4 – Red – Back-Up Light
    Terminal 5 – White-Black – Ground

    ---------
    | 1 | 2 |
    ---------
    | 3 | 4 |
    ---------
    | 5 | 6 |
    ---------
     
    #2 Elektroingenieur, Sep 1, 2018
    Rifaqat Shah likes this.
  3. RRxing

    RRxing Senior Member

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    It's in here somewhere... :eek:
     

    Attached Files:

    #3 RRxing, Sep 1, 2018
  4. edthefox5

    edthefox5 Senior Member

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    Do not chop up the wiring, go to etrailer and buy the plug and play harness with the extra power supply.
     
    #4 edthefox5, Sep 1, 2018
    Raytheeagle and padroo like this.
  5. padroo

    padroo Senior Member

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    #5 padroo, Sep 1, 2018
  6. edthefox5

    edthefox5 Senior Member

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    Linkys no load.

    But it’s the plug and play harness and then buy the extra power supply. The existing light legs will not support the extra load of incandescent tail lights on the trailer so you need extra power supply.

    Mine etrailer light system has been installed and running well for 10 years.
     
    #6 edthefox5, Sep 2, 2018
  7. Cristian Fischer Sauthier

    Cristian Fischer Sauthier New Member

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    IV
    hello, how are you, I have a problem with the stop light on my 2017 prius, only the third light is on, the one on the trunk lid, but not the sides, can you tell me the position of the ground wire for the side lights?
     
    #7 Cristian Fischer Sauthier, Jul 24, 2023
  8. edthefox5

    edthefox5 Senior Member

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    Ii could tell you but I sold my manuals when I sold my Prius. But if you plan on keeping the car for a while i highly recommend this awesome factory manual. It has electronic schematics for every device in the car including all ground points and there physical location on the car. I couldn't live without it.

    This particular book shown here is a little expensive I have seen them as low as $25 on ebay so look around. Good Luck:


    https://www.ebay.com/itm/166040185885?hash=item26a8c42c1d:g:W~EAAOSw-W5UwF4u&amdata=enc%3AAQAIAAAA8G2MOBZ6dx4gYcbf5%2BQbTJK%2BftDHJBQUXTlf6Jfd1nvMHJ5Jjf8gH57APfWlfs1E%2BC9g%2BbjL4Pp22iLex%2FhqaoonRM%2FTbtkX3C%2B037uviFCGe9nZsjMWE3vP7gVfM8%2F5okDJEB9EKmUU2JsKfkF7uhvVCCtRw1ZBH%2FIVHZGMgAJ8priWFQWkfgFY4GitgrGioCWYo0yWiRPa1SAnROLf9g0WvubyNlFz6oCXuiDe1FoFDFVBaEoDFO%2FQJrffgaESNHRexIVumOTIyYf3Q5XUqKPxM%2FQxmAqrJl88HCFSCvX87OIGdK4rzqXRKnFt%2BPLe8g%3D%3D%7Ctkp%3ABk9SR5i-wMeyYg
     
    #8 edthefox5, Jul 26, 2023
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