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Tapping the Dash Lights Circuit

Discussion in '3rd Gen. Tacomas (2016+)' started by jadoiron, Feb 2, 2016.

  1. Nov 14, 2018 at 12:12 PM
    #61
    Donkeythekidd

    Donkeythekidd Well-Known Member

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    I don't want to plug it into any 12v source because it would be lit all the time. I'm planning on tapping into the rear differential lock switch right there. It only has 4 wires going into it. One has to be for illumination
     
  2. Nov 14, 2018 at 5:31 PM
    #62
    bagleboy

    bagleboy Well-Known Member

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    Actually you need two wires, illumination power and illumination ground. The other two are switch power and switch output. Can you drop the overhead panel and take a pic of the switch and connector? The internals are all pretty much the same for each switch style, just the laser etching differs. Inside there's a printed circuit board with two leds, two resistors, and one push button switch. If the leds dont match either in color or brightness you can easily (and I mean rank beginner level soldering easy) swap in a different 3mm led or 1/4w resistor.
     
  3. Nov 14, 2018 at 8:29 PM
    #63
    Donkeythekidd

    Donkeythekidd Well-Known Member

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    For the illumination ground I'm just going to ground it to the chassis. I did the same with the switchs I installed on the left side of the steering wheel over a year ago and there still working fine. I tapped all 5 into the same illumination wire coming off one of the switchs there, and then just grounded all the wires, screwed them to the chassis.

    20181113_115351.jpg Screenshot_20181114-182405_Chrome.jpg

    Below is the back side of the upper center console
    Screenshot_20181114-202655_Gallery.jpg
    20181113_182012.jpg
     
  4. Nov 14, 2018 at 9:33 PM
    #64
    bagleboy

    bagleboy Well-Known Member

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    Only need illumination ground if you want dimming, otherwise chassis ground is fine. Keep in mind that one of the more common electrical issues is bad ground which is why some prefer to use a ground wire or buss that is connected to the battery, no rust issues.
     
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  5. Nov 15, 2018 at 9:23 PM
    #65
    bagleboy

    bagleboy Well-Known Member

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    Snug top Rebel, Thule tracks, ditch tracks, Bagged rear suspension, F/R anytime camera, intermittent wiper switch...
    4 wires on diff lock left to right:
    Black(?) illumination ground
    Black/white(?) illumination power
    Red/white 12v switch power
    Tan switch output.

    Since the aftermarket switches seem to have the same layout as the oem ones this would be my first choice for verification.

    The (?) are because I'm not certain of the colors I'm seeing in the pic which is why left to right is also listed.
     
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  6. Nov 15, 2018 at 10:05 PM
    #66
    bagleboy

    bagleboy Well-Known Member

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    2 of the 4 wires will have 12v but only 1 will always be hot with ignition on while the other should only be hot with the headlights on as well.
     
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  7. Mar 17, 2019 at 11:45 AM
    #67
    Donkeythekidd

    Donkeythekidd Well-Known Member

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    So I'm finally getting around to hooking up the illumination right now. I'm using posi-taps to splice into the rear diff switch. I tapped into the black for illumination ground and the black/white for illumination power. When I turn on my lights to illumate all my switches my garage door switch lights for a split second then goes out? Any ideas?
     
  8. Mar 17, 2019 at 2:06 PM
    #68
    Donkeythekidd

    Donkeythekidd Well-Known Member

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    So it seems like the red/white wire is illumination. I hooked it up to that wire and it works, now I just need to figure out which one is illumination ground, it's not the black one.
     
  9. Mar 17, 2019 at 3:21 PM
    #69
    Donkeythekidd

    Donkeythekidd Well-Known Member

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    Got it working right. Red/white was illumination power and the Black/white was illumination ground.

    20190317_150547.jpg 20190317_151400.jpg
     
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  10. Mar 17, 2019 at 5:27 PM
    #70
    bagleboy

    bagleboy Well-Known Member

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    Congrats, so you've got dimming and switch function now? All switch leds have an associated resistor that prevents over current and being diodes aren't harmed by reverse polarity so it's sometimes just a matter of seeing what works. Toyota doesn't seem to follow any standard color scheme and changes colors on a whim. On mine green is illumination power and green/white illumination ground. Even your aftermarket garage switch doesn't use the same colors as ch4x4 save for black being illumination ground.
     
  11. Mar 17, 2019 at 5:41 PM
    #71
    Donkeythekidd

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    Yup dimming works. :bananadance: The harness coming off the garage switch isn't from CH4x4. I bought a garage switch off ebay for $6 that came from China that stopped working correctly right after I hooked it up, I would have to push it 3-4 times for it to work. So I didn't bother hooking up the illumination. I finally got a new garage switch from CH4x4 that matches the light blue factory leds but kept the old harness since it was already soldered to my garage opener.
     
  12. Mar 17, 2019 at 6:06 PM
    #72
    bagleboy

    bagleboy Well-Known Member

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    The ebay and Amazon switches still have the same internal layout as ch4x4 and use the same connector plug, they just don't color code the wires the same as ch4x4 but should still be a simple swap. They're 5-pin connectors that don't use the center pin. I crunched one of mine by accident and opened it up to see how to change led color and intensity. Pretty simple stuff.
     
  13. Mar 17, 2019 at 6:28 PM
    #73
    banzaikid1

    banzaikid1 Well-Known Member

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    A43B80EC-D2AA-42BA-8439-B5360A393CED.jpg I used an add a fuse on the TAIL FUSE and the lights on my switches come on when I turn the lights on
     
  14. Mar 17, 2019 at 8:19 PM
    #74
    bagleboy

    bagleboy Well-Known Member

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    Lots of ways to illuminate switches but this thread is specifically about tapping the dash circuit to keep Oem dimming on all switches. If you want yours to dim as well connect the switch ground to illumination ground, not the same as chassis ground as our trucks use a variable relative ground to achieve dimming. Every switch and panel that dims will have a dimmer ground wire. I accessed the circuit at the ac controls plug using the nite-eyze instructions since my two switch panels are below it.
     
  15. Jun 10, 2019 at 8:03 PM
    #75
    The_Devil

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    Thank you for this info. It helped me wire the way I really wanted to. FYI on the 2018 Tacoma, the pins you reference above are correct, but the negative wire is tan in color.

    I used a T tap with two wire slots, and a inexpensive blue backlight LED push switch that has two bulbs: one for the writing wired to dash lights, and the other bulb lights up when the LED bar is turned on.

    Tap.jpg
    Switch.jpg
     
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  16. Aug 1, 2020 at 8:37 AM
    #76
    kperatt09

    kperatt09 Well-Known Member

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    Which switch panel did you use to get the 4 switches in?
     
  17. Aug 1, 2020 at 9:11 AM
    #77
    Donkeythekidd

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  18. Aug 1, 2020 at 9:27 AM
    #78
    fishing4boulders

    fishing4boulders Active Member

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    So reading thru this, for the CH4x4 4-wire switches.....if I wanted to be able to dim the switch lights I tap red 2 to the green wire illumination (+) and the ground to the green w/ white wire as an illumination (-). If I didn’t care about the dimming capability I could run the illumination (+) to a add-a-fuse plugged into something like the taillight fuse to power the lights (so I could more easily reverse the switches if I wanted).
     
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