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HOW TO: Wire up your LED/aux lights to work with CAN-BUS driven hi/low/parking headlights.

Discussion in '3rd Gen Tundras (2022+)' started by 99ways2die, Jul 20, 2022.

  1. Jul 20, 2022 at 9:02 AM
    #1
    99ways2die

    99ways2die [OP] New Member

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    This info is applicable to Platinum/1794/Capstone models with CAN-BUS LED headlights.
    It may or may not apply to SR5/Limited models, but I have not yet seen their headlights and/or their wiring, and I do not know if they are the more advanced "smart" (let's call it that) headlights, or the standard regular-wired ones.

    2022 Platinums come with nice LED headlights, but they're almost too nice (and too expensive).
    These lights are CAN-BUS driven, meaning that they only have 12V constant power wires, and a few thin wires in their connector.

    So, you got yourself a light bar (or more) and you wish to have it come ON when your high beams or low beams (or side lights) are on - how do you do that?
    (with old/regular lights, you'd just tap into your high beam wire on the headlight connector and use that as a trigger...not so here with CAN-BUS headlights)

    This is how:
    I found only one device that can read the CAN-BUS signal, and provides a 12V output when a function is performed by the system.
    Company name is CANM8 out of UK.
    They have a variety of products, but the 2 main models we're interested in are:
    Canm8 Cannect Highbeam (CAN Bus High beam Interface)
    https://www.ncs-systems.com/canm8-highbeam.html
    Canm8 Cannect IDR8 (CAN Bus 8 Output Interface)
    https://www.ncs-systems.com/canm8-idr8.html
    (NCS is the lowest-priced seller I could find (quick shipment to US as well))

    The 1st one has only 1 output - high beam. IDR8 (which is what I bought) has multiple outputs, but we'll concentrate on high, low and side light outputs here.
    I strongly suggest you buy the optional "contact-less CAN bus reader" so that you won't have to cut or splice your wiring at all (which can be done, but usually tricky as there isn't too much extra wiring to allow for easy splicing).

    Wiring:
    **Some basics of wiring will be omitted here; I assume you know how to do most of these things, and if not..."google it."
    Wire up your lights, using the preferred relay wiring method. Now you have a wire lead to the relay which when energized will power on your lights. You can wire your lights directly to the high beam trigger (we'll use high beams only here as example), or you can get more fancy with 3-way switches for better control. More on that below.
    CANM8 device needs to be powered by constant 12V+ source (per instructions), but you can also power it with "accessory" 12V+, so that it's only ON when your car/accessory is ON. I tapped into the top dashboard 12V cigarette outlet as it's only on when the truck is in accessory/on/running. It's also easy and convenient to access.
    Once you have power to the CANM8 device, you need to find CAN-BUS "high" and "low" wires in the vehicle system, between your ECU and the device/network you're using. Do not try to use the CAN-BUS wires on your ODBII connector-I tried and it wasn't picking up any signal (b/c it's an "end connection" and no info from ECU to lights flows that way).
    Manufacturer calls for connecting the CAN-BUS wires to as close to the truck's ECU, to ensure "strong signal" and that it picks up any and all CAN-BUS network signaling. I didn't look for ECU yet, and since I was already working with headlights and was running wiring front engine bay to the cab, I decided to use the CAN-BUS wires on the headlight itself for trigger input (driver side CAN-BUS high/low wires are white and purple).
    With the contact-less reader you simply place it over the CAN-BUS wires, then run the wires back to the CANM8 device. Now, use the output wire from the CANM8 device (high beam trigger output) to connect to your relay (or switch).
    [​IMG]

    End result: when your high beams are turned on (or flashed) the CNM8 device reads this output instantaneously, and provides 1Amp(max) 12V+ to the output wire, which then turns ON your light bar. High beams OFF...your light bar is OFF.

    My setup:
    I use the IDR8 device (for multiple outputs).
    Bumper led light bar to relay, then to a 3-way DPDT ON-OFF-ON switch (I use OTTRAW switches). Top switch position is fed by the CANM8 output trigger wire, or when the switch is in "up" position the lights turn on/off with my high beams. Middle switch position - lights are off no matter what. Bottom switch is fed by constant 12V+, so when switched "down" the light bar is ON regardless of any other condition.

    My amber fog lights are set up is a similar way. Top switch position is connected to CANM8 "side lights" output, which makes the fog lights come on any time the side/parking lights are on (so I can have my parking lights on, OEMM fog light on or off, fog lights). When parking lights are on, the fog lights come on with them (and with OEM driving lights). Middle position is OFF, and bottom turns them on independently of anything else.
    Here's my switching and location (this is best/only? place where I could fit a 3 switch panel):
    [​IMG]
    As you can see "light bar" is always on AUTO/top position to turn on with high beams automatically.
    Amber "fog lights" are off, and I can choose to run them auto on with side lights.
    My interior (red) lighting is wired/switched the same way (although wired differently and not via the CANM8 device).
    The 2 round button switches above are for my axillary back up lights (mounted under the rear bumper). I used the trailer hitch wiring plug to tap into, so it doesn't use the CANM8 (albeit it can be done that way as well). Mine are used with dual current limiting diodes, to achieve this:
    When truck is put in "R" the aux lights come on with my back up lights; When not in "R" I can turn the aux lights on with the left round button switch; I can also flash them with the momentary small round switch (right side) if I want to - at any time. Dual diodes ensure that pressing the switches on any any time *during driving/etc) do not trick the truck into thinking that it's in "reverse."

    Last but not least, here's my power distribution.
    Circuit breaker from batt (optional; I think it is as main disconnect switch really), BlueSea 6x fuse panel; all lights/relays get it's power from this:
    [​IMG]

    Relay block/mount:
    [​IMG]

    And again, perhaps SR5/Limited wiring is simple and "old fashioned" which doesn't require a CAN-BUS interface for trigger wire output, but any and all CAN-BUS lights (seems that all new vehicles do this now, not only Toyota) need something to pick up output signal, and provide trigger outputs.
    CANM8 is the only interface I found; not widely known in US (according to them I am the 1st US 2022 Tundra user of their device(s)...and very few use it here to begin with).
    Despite our Tundra not being listed as compatible vehicle on their solutions work 100% (I assume CAN-BUS protocol is standard/universal across all car manufacturers).

    Hope this info is useful for you guys.
    If really needed, I can draw up wiring schematics for my set up, but most of it should be already known, and there are tons of web resources to guide you how to wire up lights, relays and switches.

    Feel free to ask Qs, comment, etc.
    -99
     
    Last edited: Jul 20, 2022
    TX3rdGen, ryanwgregg, mmasse and 6 others like this.
  2. Jul 20, 2022 at 5:19 PM
    #2
    Shave Ice

    Shave Ice New Member

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    Great write up! Thank you sir.
     
  3. Jul 20, 2022 at 6:02 PM
    #3
    t300

    t300 New Member

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    Great write up, I’ll be using this for sure
     
  4. Jul 20, 2022 at 6:59 PM
    #4
    DexterL

    DexterL New Member

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    Man this is huge.. wish I had seen it a few weeks ago before I ran wiring for my switch pros and all my current and future lights! How does the increased light work with the auto high beams?
     
  5. Jul 20, 2022 at 8:38 PM
    #5
    Brums

    Brums New Member

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    i remember you saying you were going to order that device, glad to see that it works great and seems like it is a rather straightforward kinda thing

    kinda looks like that high beam module *could* possibly be used for other things as well if doing like what you did, if putting it on/near the device you are wanting the signal from, if needing strictly an on/off signal, very cool

    you said you have the IDR8?
    with putting the contactless connector there at the connector for the light, were you able to get any of the other outputs that the IDR8 shows having?, like im guessing you wouldn't get speed signal there or brake output. but like the turn signals, side lights and low beam and ign on?

    thats really really cool
     
  6. Jul 20, 2022 at 8:40 PM
    #6
    Brums

    Brums New Member

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    also curious as to how much $ you have in the device and getting it here, if you don't mind sharing
     
  7. Jul 21, 2022 at 11:02 AM
    #7
    99ways2die

    99ways2die [OP] New Member

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    Low beams:
    [​IMG]

    High beams:
    [​IMG]

    High beams + light bar:
    [​IMG]

    Light bar only:
    [​IMG]

    PS:
    For pricing of the CANM8 devices, just add everything you'd wan tot the cart, then use online currency converters to get current rate/cost. I paid with VISA and my bank did this automatically.
     
  8. Aug 7, 2022 at 2:28 PM
    #8
    Prohit

    Prohit New Member

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    it would be $175 USD with the wireless connection
     
  9. Nov 13, 2022 at 5:26 PM
    #9
    virgilus11

    virgilus11 New Member

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    OP ,
    This is a fantastic find. . Would you like to draw a schematic for the high beam only, no switch ? I installed additional lights in the front and scraping my head how to run it of the high beams, strictly when high beams are on. I have the harness running from the battery to a relay then to the lights. I have the trigger wire from the relay but unfortunatelly nowhere to connect it .
    Thank you 1000 times.
     
    Last edited: Nov 13, 2022
  10. Nov 13, 2022 at 7:23 PM
    #10
    99ways2die

    99ways2die [OP] New Member

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    Virgil:
    So, your trigger wire now goes to either a 12V+ switch (so that the lights/relay are activated manually), or to the high beam output(purple) wire on the "CANM8 CANNECT HIGHBEAM" if you have/get it.
    This is assuming that you want your aux lights activated only when high beams are on, and only in that method.
    (in other words, nothing else will will turn your aux lights on-only the trigger wire connect to whatever source).


    I don't think you need a schematic here, just install the CANM8 device properly, then use it's desired output wire for the trigger, and you're done.
    Hope I'm not confusing you and this helps a bit.

    PS:
    If you're really stuck, IM me.
    -99
     
  11. Nov 14, 2022 at 2:27 AM
    #11
    virgilus11

    virgilus11 New Member

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    I did order it last night Thank you very very much. Really helpful.
     
    ryanwgregg likes this.
  12. Nov 14, 2022 at 7:43 AM
    #12
    99ways2die

    99ways2die [OP] New Member

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    BTW:
    CANM8 installation instructions call for "constant" 12V+ power source for the device, but you don't have to do that.
    There is really no need to have it powered constantly, so if you want, you can just tap power for it anywhere else, with Accessory ON wire.
    I tapped into my top of the dashboard 12V cigarette lighter outlet, since that gets turned on once the truck is in Accessory ON position. Everything works like a charm.

    -99
     
    ryanwgregg likes this.
  13. Nov 14, 2022 at 7:54 AM
    #13
    virgilus11

    virgilus11 New Member

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    Thinking to run it directly from the battery. Would this draw a lot I leave the car over the weekend ?
    Thank you for your help
     
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  14. Nov 14, 2022 at 3:09 PM
    #14
    99ways2die

    99ways2die [OP] New Member

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    Nahh. It won't draw any power to be of concern even for long term storage.
    I was just saying-if there is no need then why bother...but if you wanna leave the CANM8 box in the engine bay and keep all wiring "local" then I understand.
    I wouldn't worry either way.
    -99
     
    ryanwgregg likes this.
  15. Nov 14, 2022 at 3:25 PM
    #15
    virgilus11

    virgilus11 New Member

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    Thank you 99. Great info.
     
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