1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Trailer Disconnect TSB Solved!

Discussion in '2.5 Gen Tundras (2014-2021)' started by Greg Marmalard, Apr 15, 2019.

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

    Greg Marmalard [OP] New Member

    Joined:
    Mar 15, 2019
    Member:
    #27637
    Messages:
    197
    Gender:
    Male
    Vehicle:
    2019 Tundra TRD Off Road Double Cab
    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
     
  2. Apr 22, 2019 at 6:51 AM
    #2
    TOYgolfer

    TOYgolfer New Member

    Joined:
    Apr 21, 2019
    Member:
    #29430
    Messages:
    2
    Gender:
    Male
    Vehicle:
    2018 BLUE Toyota Tundra TRD Sport
    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

    Joined:
    Mar 15, 2019
    Member:
    #27637
    Messages:
    197
    Gender:
    Male
    Vehicle:
    2019 Tundra TRD Off Road Double Cab
    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

    Joined:
    Nov 4, 2018
    Member:
    #21345
    Messages:
    16
    Gender:
    Male
    First Name:
    Joe
    San Rafael
    Vehicle:
    2018 TRD
    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

    Joined:
    Nov 4, 2018
    Member:
    #21345
    Messages:
    16
    Gender:
    Male
    First Name:
    Joe
    San Rafael
    Vehicle:
    2018 TRD
    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

    Joined:
    Mar 15, 2019
    Member:
    #27637
    Messages:
    197
    Gender:
    Male
    Vehicle:
    2019 Tundra TRD Off Road Double Cab
    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 A bottom line is a butt crack. Don’t prove it.

    Joined:
    Oct 9, 2016
    Member:
    #4814
    Messages:
    3,691
    Gender:
    Male
    First Name:
    Phil
    BC, Canada
    Vehicle:
    ‘08 TRD doublecab
    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

    Joined:
    Nov 4, 2018
    Member:
    #21345
    Messages:
    16
    Gender:
    Male
    First Name:
    Joe
    San Rafael
    Vehicle:
    2018 TRD
    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 A bottom line is a butt crack. Don’t prove it.

    Joined:
    Oct 9, 2016
    Member:
    #4814
    Messages:
    3,691
    Gender:
    Male
    First Name:
    Phil
    BC, Canada
    Vehicle:
    ‘08 TRD doublecab
    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

    Joined:
    Nov 4, 2018
    Member:
    #21345
    Messages:
    16
    Gender:
    Male
    First Name:
    Joe
    San Rafael
    Vehicle:
    2018 TRD
    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 A bottom line is a butt crack. Don’t prove it.

    Joined:
    Oct 9, 2016
    Member:
    #4814
    Messages:
    3,691
    Gender:
    Male
    First Name:
    Phil
    BC, Canada
    Vehicle:
    ‘08 TRD doublecab
    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?
     
  12. Sep 1, 2019 at 6:03 AM
    #12
    TonOfFunDra

    TonOfFunDra New Member

    Joined:
    Sep 1, 2019
    Member:
    #35433
    Messages:
    2
    Gender:
    Male
    Vehicle:
    2019 Silver TRD 4x4
    My dealer found the service bulletin. Here is the info:


    T-SB-0036-19 April 1, 2019

    “Trailer Disconnected “ Message


    Warranty Information:


    OP Code EL 1904


    Description Reprogram ECU

    (Trailer Brake Controller ECU)


    Time. .3


    OFP 89547-0C020


    T1 87


    T2 74


    Hope this helps. Am scheduled for the fix on Sept 4. Will let you know what happens
     
  13. Sep 10, 2019 at 2:41 PM
    #13
    MaxThurst27

    MaxThurst27 New Member

    Joined:
    Oct 16, 2018
    Member:
    #20643
    Messages:
    49
    Gender:
    Male
    First Name:
    Rod
    Vehicle:
    2019 Tundra TRD PRO Voodoo Blue!
    My 2019 vin doesn't match the vins noted above.

    My truck has yet to show connected. 2 brand new trailers. Bummer
     
  14. Aug 6, 2020 at 7:56 AM
    #14
    Jestpest

    Jestpest New Member

    Joined:
    Aug 6, 2020
    Member:
    #50410
    Messages:
    1
    Gender:
    Male
    2018 1794 edition. Had same issue. Constantly beeping while driving down the road while towing any 7-pin trailer. It was the most annoying thing ever. Found this thread and it was a simple software update. Thank you so much for posting!
     
  15. Mar 20, 2021 at 10:34 AM
    #15
    Jamesausman

    Jamesausman New Member

    Joined:
    Mar 8, 2021
    Member:
    #60172
    Messages:
    9
    Gender:
    Male
    First Name:
    Jim
    Vehicle:
    2018 5.6L SR5
    My 2018 doing this. The lights are working fine. Do the trailer brakes work? I have the trailer hooked up for the first time. Is it not safe to tow until the issue is resolved?
     
  16. Mar 22, 2021 at 5:58 PM
    #16
    pillpusher84

    pillpusher84 New Member

    Joined:
    May 4, 2020
    Member:
    #45918
    Messages:
    59
    Gender:
    Male
    Vehicle:
    2022 BMW i4 M50i
    Thanks! I need to have this done to mine as well!
     
  17. Jan 8, 2022 at 5:10 PM
    #17
    rdiddy5

    rdiddy5 New Member

    Joined:
    Jan 5, 2022
    Member:
    #72677
    Messages:
    117
    First Name:
    Ryan
    Arizona
    Vehicle:
    2018 Crewmax 1794 4x4
    I've got a 2018 1794 edition, having this issue. Booking service appt now...
     
  18. Apr 18, 2022 at 12:01 PM
    #18
    Hoologan

    Hoologan New Member

    Joined:
    Dec 27, 2017
    Member:
    #11764
    Messages:
    279
    Gender:
    Male
    California
    Vehicle:
    18 Cement Limited Crewmax TRD
    I just picked up a new trailer, and I'm having this problem now. I called the dealership and their little computer said my VIN is not affected, but I know it is because the TSB says all VINs BEFORE those listed. The 10th digit in the listed VIN is the model year with K being 2019. Mine is a J for 2018, therefore it is in fact BEFORE the listed VIN. Waiting on a service advisor to call me back about it since the receptionist would not listen to me.
     
  19. May 7, 2022 at 2:24 PM
    #19
    Badderup

    Badderup New Member

    Joined:
    Apr 16, 2022
    Member:
    #77256
    Messages:
    9
    Gender:
    Male
    First Name:
    A.J.
    Utah
    Vehicle:
    2019 Crew max
    Vent visors Side steps - wife and daughter are short
    Just bought a 2019 last week and hooked up my trailer for a trip this weekend. I got the message so scheduled a service call with local dealership and they did the software update. Problem solved. Towed it up the mountain yesterday and had zero issues.
     

Products Discussed in

To Top