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Yellow Box Speedo Calibrator

Discussion in '1st Gen Tundras (2000-2006)' started by Darkness, Sep 22, 2018.

  1. Jun 27, 2020 at 8:59 PM
    #61
    04TundraTRD

    04TundraTRD Once upon a time....

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    Bilstein 5100's on all four corners, Setting 4 on the fronts, 1" Front Diff Drop Kit, 1" lift shackles out back, 1.5" wheel spacers all around, 285/75R16 BFG AT TA/KO2's, Front Brush Guard with 20" LED light bar, Kool Vue Dodge style tow mirrors, Yellow Box Speedo Corrrector by Yellr, Volant CAI, Banks Monster 3” Catback Exhaust
    The reason for the length is because the ABS ECU is on the right side of the engine, meaning the harness has to cross the engine compartment at the firewall and then still have enough length to go into the cab and be able to set the unit. I got 3 meters and where you see the unit laying just behind the e-brake pedal is as far as it would reach. You could also install this in the cab by removing the gauge cluster and splicing the harness there and use a keyed power and ground inside the cab. I preferred going under the hood because it is easily reversed if I ever go back to a stock tire size. As far as the programming. Yellr can set your correction ratio before they send you your unit so you don’t have to. Also, like you the first unit I purchased was a 2-wire unit. Yellr exchanged it free of charge, so don’t go selling it just yet. They sent me my new one and just asked I send the first one back in the same package as return to sender. They did only exchange the unit and not the harness so you may be stuck with it. What length did you purchase and how is it configured? I ask because you may be able to use it.
     
    Last edited: Jun 27, 2020
  2. Jun 27, 2020 at 9:08 PM
    #62
    Darkness

    Darkness [OP] Allergic to white

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    @04TundraTRD that's some clean work, glad you found a way to make it happen!
     
  3. Jun 27, 2020 at 9:23 PM
    #63
    Tohopko

    Tohopko New Member

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    I ordered the V5 plug and play version, along with 3m of harness. Essentially 4 wires with plugs.
     
  4. Jun 28, 2020 at 5:57 AM
    #64
    04TundraTRD

    04TundraTRD Once upon a time....

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    Bilstein 5100's on all four corners, Setting 4 on the fronts, 1" Front Diff Drop Kit, 1" lift shackles out back, 1.5" wheel spacers all around, 285/75R16 BFG AT TA/KO2's, Front Brush Guard with 20" LED light bar, Kool Vue Dodge style tow mirrors, Yellow Box Speedo Corrrector by Yellr, Volant CAI, Banks Monster 3” Catback Exhaust
    The harness is the same for both units. You could try to find the connector to match the PnP or just cut it and use it as is.
     
  5. Jun 28, 2020 at 1:01 PM
    #65
    seth419

    seth419 New Member

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    This is awesome, thanks for figuring it out!!! Bare with me as electrical stuff is not my strong point. It looks like the fuses in my 05 are completely different than the 04 and I have to tap into the key power in the fuse panel under the driver side dash and I need to figure out what pwr fuse is the key power.

    I only have 2.5 meters of harness so I will probably just have to extend that with extra wire I have. Before I break it, how do you disconnect the ABS ECU connector? Just push in the side tabs and pull up?IMG_0788.jpg IMG_0789.jpg
     
  6. Jun 28, 2020 at 7:20 PM
    #66
    04TundraTRD

    04TundraTRD Once upon a time....

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    Bilstein 5100's on all four corners, Setting 4 on the fronts, 1" Front Diff Drop Kit, 1" lift shackles out back, 1.5" wheel spacers all around, 285/75R16 BFG AT TA/KO2's, Front Brush Guard with 20" LED light bar, Kool Vue Dodge style tow mirrors, Yellow Box Speedo Corrrector by Yellr, Volant CAI, Banks Monster 3” Catback Exhaust
    I honestly cant remember how the connector is disconnected, but I'll check it out tomorrow. As far as your key power I would check the two fuses listed as IGN on your in cab fuse panel, and with a short harness I would probably do the complete install in the cab. Also, I'm pretty sure that the speedo wire on the '05 is a different color but can still be spliced behind the speedo itself. It is completely up to you though, if you do go under hood you will definitely have to extend the harness. Good luck, and let me know how it turns out. I'll keep an eye on the thread if you have any questions.
     
    seth419 likes this.
  7. Jun 29, 2020 at 10:27 AM
    #67
    seth419

    seth419 New Member

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    I figured out the ABS connector, its kind of a cool design. You just press the side tabs and wiggle the white locking part up and it comes right off. I contacted Jennifer and she was nice enough to offer me a new harness, so I will just request 4m. I sent her this thread and she was surprised that it didn't throw a code when splicing the ABS. Your previous post said the speedo wire is white/violet on 05-06, which I was able to find at the ABS under the hood. I do like the idea of doing it all in the cab though.

    I will keep this thread updated with photos of my install for all the 05-06 guys out there.
     
  8. Jun 29, 2020 at 11:00 PM
    #68
    CodyP

    CodyP New Member

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    I’d sure appreciate a diy for the 06
     
  9. Jul 1, 2020 at 9:08 PM
    #69
    Tohopko

    Tohopko New Member

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    Well, thanks to Neil's encouragement and great detective work finding that the ABS signal drives the speedo, I can now say the Yellow Box works on the 2004 Double Cab auto as well. I did not use exactly the same method--the colors for the double cab at the ABS computer are different, and I could not locate exactly the color I needed. While I was searching, however, I ran across the page in the factory manual that shows the inputs and pin positions for the "combination meter"...i.e. dash cluster. I was able to determine that plug "C", pin #2 was the wire feeding the signal to the speedo and tapped there. Too easy!

    Power is from the dash fuse panel, since the 04DC has the power outlets fused there. Used a fuse doubler in the power outlet slot and connected to the red wire on the Yellowbox harness (V5 with the prewired harness, but I cut the plugs off the transmission end)20200701_193518~2.jpg 20200701_193525~2.jpg

    Next, the black wire is grounded to a metal screw beneath the kick panel--the box will rest here as well, after programming.20200701_193615~2.jpg

    Now, pull the cluster, and carefully unplug the 4 plugs connecting the wire bundles. You want plug C, which is the second from the passenger side.20200701_193916~2.jpg
    Locate the wire from pin #2 (ignore that white wire, it is the Yellowbox harness, just snuck into the picture), in my case, blue with a white stripe and two silver rings. Cut the wire, leaving enough room for your connectors. The white wire from the Yellowbox will take the input form the ABS computer to the Yellowbox, the blue wire feeds it back to the speedo plug.20200701_193939~2.jpg


    Boom, just like that, Bob's your uncle. Now just follow the programming directions, seal everything up, and enjoy a calibrated speedo.


    For the 2005 and 2006 Double cab, there were changes to the speedo cluster, but I'll bet it is very similar. The 05/06 FSM should show the correct pin and input.
     
  10. Jul 1, 2020 at 9:09 PM
    #70
    Tohopko

    Tohopko New Member

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    Cody, see the post above. I'll bet we can figure this out.
     
  11. Jul 1, 2020 at 10:53 PM
    #71
    CodyP

    CodyP New Member

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    I just saw it. But as ‘smart’ as I am. I can’t follow wiring diagrams so I may just pass on this whole thing.
     
  12. Jul 2, 2020 at 3:45 PM
    #72
    Tohopko

    Tohopko New Member

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    Cody, have you had your cluster out of the dash? Is it two plugs? I believe the speed signal comes from pin A24--at least according to the 05-06 FSM.
     
  13. Jul 2, 2020 at 4:06 PM
    #73
    CodyP

    CodyP New Member

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    No I haven’t on this truck
     
  14. Jul 3, 2020 at 4:33 AM
    #74
    04TundraTRD

    04TundraTRD Once upon a time....

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    Bilstein 5100's on all four corners, Setting 4 on the fronts, 1" Front Diff Drop Kit, 1" lift shackles out back, 1.5" wheel spacers all around, 285/75R16 BFG AT TA/KO2's, Front Brush Guard with 20" LED light bar, Kool Vue Dodge style tow mirrors, Yellow Box Speedo Corrrector by Yellr, Volant CAI, Banks Monster 3” Catback Exhaust
    Great write up man. I’m glad to see you were able to adapt it to work on the DC. With a little teamwork we’ll get Cody going too.
     
  15. Jul 3, 2020 at 4:35 AM
    #75
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    I love this kind of innovation. :yes:
     
  16. Jul 3, 2020 at 4:38 AM
    #76
    04TundraTRD

    04TundraTRD Once upon a time....

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    Bilstein 5100's on all four corners, Setting 4 on the fronts, 1" Front Diff Drop Kit, 1" lift shackles out back, 1.5" wheel spacers all around, 285/75R16 BFG AT TA/KO2's, Front Brush Guard with 20" LED light bar, Kool Vue Dodge style tow mirrors, Yellow Box Speedo Corrrector by Yellr, Volant CAI, Banks Monster 3” Catback Exhaust
    I’ll be out of pocket for most of the day. If I have some extra time tonight I’ll dig into my ‘06 FSM and see about your harness Cody.
     
    CodyP likes this.
  17. Jul 3, 2020 at 9:43 AM
    #77
    CodyP

    CodyP New Member

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    You’re amazing. I’m not stupid but I only know enough about wiring to get me into trouble.
     
  18. Jul 3, 2020 at 7:54 PM
    #78
    04TundraTRD

    04TundraTRD Once upon a time....

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    2004 Tundra TRD 4WD AC
    Bilstein 5100's on all four corners, Setting 4 on the fronts, 1" Front Diff Drop Kit, 1" lift shackles out back, 1.5" wheel spacers all around, 285/75R16 BFG AT TA/KO2's, Front Brush Guard with 20" LED light bar, Kool Vue Dodge style tow mirrors, Yellow Box Speedo Corrrector by Yellr, Volant CAI, Banks Monster 3” Catback Exhaust
    I understand where you're coming from. I've been an equipment tech now for 3 years and it's helped me be more confident in my skills when it comes to the electrical troubleshooting and repairs. Especially when it comes to reading wiring diagrams. I'm attaching some PDF's of the relevant wiring diagrams and the combination meter connectors. It appears that the Speedo gets its signal from Pin 24 on Connector A at the combination meter. It should be a Violet w/ White Tracer Wire. Let me know if you have more questions.
     

    Attached Files:

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