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Trailer Wiring Type or Connection Fault

Discussion in '2.5 Gen Tundras (2014-2021)' started by spyshot, Sep 9, 2021.

  1. Sep 9, 2021 at 9:04 AM
    #1
    spyshot

    spyshot [OP] New Member

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    Here are the facts:

    Getting this error on my dash intermittently when towing my old/restored camper.
    Using integrated brake controller.
    When the error comes on, my trailer brakes do not work.
    Error will clear itself but then may come back on.
    Just started happening on my recent trip when raining heavily.
    Have towed this camper with this truck for two years and many miles with no issues.
    Have towed other trailers with brakes with no issues.
    I don't think it is the truck, I'm looking into the camper as the issue.
    No water is getting into the vehicle plug.

    What causes this error to appear? (the instruction manual said something about reverse voltage??) The vehicle must see that there is a trailer attached but is seeing a problem. Dead short on the brake circuit?

    I'm thinking about re-wiring the brakes back to the plug just to eliminate a possible problem with worn insulation on wiring.

    Thoughts?
    Thanks
    Adam
     
  2. Sep 9, 2021 at 9:55 AM
    #2
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

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    There have been a lot of known issues with the OEM brake controller. Some folks have gotten a positive outcome by having their dealership update the program on the controller. Others have not been able to get it resolved. Do a search (upper right on screen) for OEM brake controller and you will get a lot of reading to wade through. Some folks have gone with a 3rd party controller and been happy with the result. Good luck in getting things resolved.
     
  3. Sep 10, 2021 at 2:35 PM
    #3
    spyshot

    spyshot [OP] New Member

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    In the research that I've done, it seams the message that most people are getting is "trailer disconnected, so I really do not think it is the truck. I know I'm on a Tundra forum and not a trailer forum, but was hoping to get a few techie guys to help anyway. I did some testing today. Right now I cannot get the message to appear under normal conditions. I was thinking why this message and not "trailer disconnected" message. Well the truck must be seeing that the trailer is there but sees a problem. A direct short maybe? So I disconnected my trailer's main brake wires and tied them together creating a short. Sure enough, without even applying the brakes, the message appeared. So it seams the truck must send out a periodic signal and can tell when there is a direct short. It did not blow a fuse so it must cut power under this condition.

    I don't think this particular message is an issue with the OEM brake controller.
     
    Last edited: Oct 3, 2021
  4. Oct 3, 2021 at 5:47 PM
    #4
    spyshot

    spyshot [OP] New Member

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    ***Problem found***

    **The manufacturers run the brake wires through the inside of the axle to get from one side to the other. Problem is that since the wires are not tied down, they vibrate and rub through the insulation. I pulled mine out of one axle and sure enough! I found a spot where that had happened and bare wire was exposed. That would cause a direct short and would cause that message to come up on the dash.

    This is not an issue with the OEM brake controller.

    I am rewiring the camper this week.

    Adam
     
  5. Oct 12, 2021 at 6:16 PM
    #5
    spyshot

    spyshot [OP] New Member

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    Update: Problem solved
     
    Jtundra81 and Tundratoofun like this.
  6. Oct 12, 2021 at 6:21 PM
    #6
    Tundratoofun

    Tundratoofun redline redneck

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    so the bare wire inside the axle was grounding on the axle itself?
     
  7. Oct 13, 2021 at 4:01 AM
    #7
    spyshot

    spyshot [OP] New Member

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