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2019 Tundra Air On Board wiring

Discussion in '3rd Gen Tundras (2014+)' started by ncorry, Feb 11, 2019.

  1. Feb 11, 2019 at 1:55 PM
    #1
    ncorry

    ncorry [OP] New Member

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    I'm seeing a ton of conflicting information on the wiring of an Air On Board switch to a LED bar. Are 2019 Tundra headlights a negative switch or a positive switch? Is there a diode required? Air On Board doesn't seem to know the answers.
     
  2. Feb 11, 2019 at 3:22 PM
    #2
    coastaldad

    coastaldad New Member

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    Following, as I need the answer also. Installed an RC "30 lightbar yesterday and want to replace the switch it comes with. I have an air on board switch and wasn't sure about the wiring. Mine is a 2018
     
  3. Feb 11, 2019 at 3:34 PM
    #3
    NewImprovedRon

    NewImprovedRon SouthBoundSteve Fan Club President

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    The AOB switch should have a diagram on the reverse side (?) for the wiring. Is it a 4-wire switch? Are you using your own wiring harness/relay or are you using a wiring harness that came with your light bar? The switch itself, if it is a 4-wire switch, should have a ground wire, a trigger wire that goes to your relay to turn it on, a power wire that goes to fuse tap, and an illumination wire that goes to your dash illumination circuit. The illumination wire enables the switch to be back lit when you turn on your lights from the light stalk switch.
     
    831Tun likes this.
  4. Feb 11, 2019 at 4:44 PM
    #4
    coastaldad

    coastaldad New Member

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    Using the wiring harness that comes with the lightbar as it already has the relay installed.
    The RC lightbar come with a three wire switch. Black, blue, and white wires.
    The AOB switch has four. Red, Green, Blue, and Black. The below diagram is what comes with the AOB switchA6341A6F-E514-4B72-A1DC-D36DE44FA400.jpg 3EAEB4D1-0D22-4701-AF68-99BEDCBC4FC6.jpg 324145C2-A1B8-4D4C-8E67-4746BD3DE29F.jpg
     
  5. Feb 11, 2019 at 5:33 PM
    #5
    NewImprovedRon

    NewImprovedRon SouthBoundSteve Fan Club President

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    Ok, take a look at this post and see if it answers your questions. Start at post #6:

    https://www.tundras.com/posts/703139/
     
    Last edited: Feb 11, 2019
  6. Feb 11, 2019 at 7:31 PM
    #6
    coastaldad

    coastaldad New Member

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    I’m not sure why I can’t quite figure this out. Have read that thread a few times and it’s just not clicking.
     
  7. Feb 12, 2019 at 5:03 AM
    #7
    NewImprovedRon

    NewImprovedRon SouthBoundSteve Fan Club President

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    Did any instructions or a diagram come with the original relay and switch? Is your wiring harness/relay the same as the one pictured in the post I linked? We just need to figure out what each wire is for (blue, black, white) from the 3-wire harness and convert it to the the AOB 4-wire switch. If your harness/relay is like the one I posted in the link, we already know that the red wire going to the terminal ring connects to the relay Pin 30 because it has an in-line fuse.
     
  8. Feb 12, 2019 at 6:05 AM
    #8
    coastaldad

    coastaldad New Member

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    It’s the same harness as in the other post. Did not come with a wiring diagram, since was prewired to the switch. You just connect wires to battery, mount relay, and run wiring inside the truck. I’ve hooked it up and it works just fine with the factory switch. I just want to use the AOB switch to match other factory ones. The black, blue, and white wires are the part of harness going from relay into cab to the exisitng switch.
    I appreciate your help very much.
     
    NewImprovedRon likes this.
  9. Feb 12, 2019 at 6:17 AM
    #9
    NewImprovedRon

    NewImprovedRon SouthBoundSteve Fan Club President

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    Ok, can a little wiring insulation going to the relay be removed to see which color wires are connected to which pins on the relay? Once you know, you can always re-cover with electrician's tape. If we can see which pins the wires go to, we can tell which wires colors need to go to your AOB switch. The relay should have 4 pin numbers on it Pin 87, Pin 30, Pin 85, and Pin 86
     
  10. Feb 12, 2019 at 6:52 AM
    #10
    ncorry

    ncorry [OP] New Member

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    NewImprovedRon- looking at the AOB diagram in post #4, should we be using Diagram 1 or Diagram 2?

    I'm really trying to be certain on this, as there have been reports of frying the ECU by hooking up the wrong switch wires to the illumination circuit. ( )
     
  11. Feb 12, 2019 at 9:03 AM
    #11
    danz75

    danz75 New Member

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    I have the RC 30" curved light bar and used the AOB switch.

    The blue wire from the RC harness is the wire you want to connect to green wire on the AOB switch. I also grounded the black wire from the RC harness.

    From the AOB switch, black goes to ground, red goes to the add a fuse on the drivers side fuse panel for power on ignition, and the blue wire is tapped from an adjoining lighted switch. Depending on where you install the switch, just find the closest switch that is backlit when the lights are turned on. The tricky part is finding the correct wire for the backlight.
     
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  12. Feb 12, 2019 at 10:30 AM
    #12
    coastaldad

    coastaldad New Member

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    Thanks. I’ll give that a shot.
     

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