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Trailer Disconnect TSB Solved!

Discussion in '3rd Gen Tundras (2014+)' started by Greg Marmalard, Apr 15, 2019.

  1. Apr 15, 2019 at 4:51 PM
    #1
    Greg Marmalard

    Greg Marmalard [OP] New Member

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    Howdy,

    Got local Toyota to perform ECU flash as per TSB 0036-19 and it solved the problem on my 2019 Tundra. Finally towed today with no problems confirming it works in my case.

    I gather some dealers couldn't figure it out but it does exist and it did work in my case.

    See attached and show service department if they can't figure it out.

    Good luck!

    Greg

    tsb.jpg
     
    Durania and Watt maker like this.
  2. Apr 22, 2019 at 6:51 AM
    #2
    TOYgolfer

    TOYgolfer New Member

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    Hi Greg, my 2018 Tundra is doing the same thing . Can you give me the name and location of your dealer so I can reference them when I take my truck in. For some reason i could not print your screen page. Thanks.
     
  3. Apr 22, 2019 at 7:25 AM
    #3
    Greg Marmalard

    Greg Marmalard [OP] New Member

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    Hi,

    Desert Toyota in Tucson performed the TSB for me

    I couldn't make it to the dealer who told me (Earnhardt in Mesa AZ) and first one I called argued that one does not exist! Refused to even consider it and insisted on leaving Tundra there all day so they can do numerous system checks!

    Called Desert Toyota who was less argumentative and in 5 minutes found the TSB, made an appt and in 2 hours was done (they did the the other recall radar deal too). Can take as little as 15 minutes but it relies on Toyota server and connection speed etc.

    All they need is the 0036-19 and that 19 may mean 2019 specific. Perhaps you can talk them into doing it on a 2018....

    HTH

    G
     
  4. Apr 26, 2019 at 6:02 PM
    #4
    Joek

    Joek New Member

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    Having mine programmed tomorrow.they say it should fix the problems with my 2018 Here is the TSB print out

    20190426_174200.jpg
     
  5. Apr 27, 2019 at 5:11 PM
    #5
    Joek

    Joek New Member

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    Looks like it still doesn't address the non communication with electric over hydraulic issues my truck has. My truck still doesn't acknowledge my airstream trailer plugged in. But works with regular electric brakes....hopefully this will help out your other issues. Super bummed
     
  6. Apr 27, 2019 at 6:55 PM
    #6
    Greg Marmalard

    Greg Marmalard [OP] New Member

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    My Airstream came with a crummy Bargman electric plug. Mine hardly seats at all but is working. I bought a highly recommended Pollak plug for $10 or less on Amazon and it is a super tight positive fit.

    I'm gonna replace mine when I have some spare time. May be worth a shot. Only trick is wiring diagram... I think I found one somewhere. Message me if you want to try that and I'll find it.

    Greg
     
  7. Apr 27, 2019 at 7:03 PM
    #7
    landphil

    landphil I know nothing, and I’m still confused.

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    Phil
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    I’m assuming you’ve changed the setting to “electric-over-hydraulic” and still having the issue then? If not, here’s all about setup.

     
  8. Apr 27, 2019 at 7:37 PM
    #8
    Joek

    Joek New Member

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    The system doesn't even acknowledge the trailer connected even though all the lights work. If it doesn't see the trailer you cannot change the settings. I went through this with Toyota engineer's supplying them resistance values between the harness and and the control module in the airstream 7 months ago What gets me is no one can tell me what value the module need to see to acknowledge the trailer is connected. It's a resistance feed back from the trailer brakes that it needs to see. Looks like I either have to put in a new controller system cut and splice into my new truck or different brand truck. Never had any towing or trailer issues with my dodge.
     
  9. Apr 27, 2019 at 7:52 PM
    #9
    landphil

    landphil I know nothing, and I’m still confused.

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    Interesting that you can’t select a brake system type without it recognizing the trailer.

    The integrated brake controller on the Tundra has had a lot of complaints on the forum but I wouldn’t give up on your Tundra over it.

    What about adding a resistor wired in parallel with the brake pump unit on the trailer. Something like:

    https://www.amazon.com/PHILIPS-1895...er/dp/B00P2D46N2#immersive-view_1556419877195

    5W and 21W versions available.
     
  10. Apr 27, 2019 at 8:04 PM
    #10
    Joek

    Joek New Member

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    That's the resistance values I have been asking for from Toyota but no one seems to know.
     
    landphil likes this.
  11. Apr 27, 2019 at 8:26 PM
    #11
    landphil

    landphil I know nothing, and I’m still confused.

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    You might find this interesting.

    https://www.etrailer.com/faq-testing-trailer-brake-magnets-for-proper-function.aspx

    I know it’s talking about electric brakes, but based on the individual magnet resistance specs at the bottom, 1.5 to 1.9 ohms total for a single axle trailer with 10/12” brakes, or 0.75 to 0.95 ohms total for a tandem axle. I know it’s comparing electric brakes to electric over hydraulic, but somewhere in that resistance range should get recognized.

    What electric over hydraulic brake unit does your trailer have? And what is the resistance between the brake pin and ground?
     

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