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Dome light Wiring- negative switch

Discussion in '2.5 Gen Tundras (2014-2021)' started by ncorry, Mar 20, 2019.

  1. Mar 20, 2019 at 8:02 AM
    #1
    ncorry

    ncorry [OP] New Member

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    UPDATE- I tried this out using the AOB diagram 1 and tapped the pink (2019) wire behind the driver's A-pillar into the switch as the trigger and into the relay as the +12V power. I now have a separate switch to control the footwell lights and if I forget about them, the truck's 20 minute time out on the dome light will turn them off.


    I'm adding some footwell LEDs and instead of wiring them to the footwell light bulb, I want to tie them into the interior/ Dome light circuit so I can control them with the dome lights. I've searched on here for the dome light wiring and it seems that the dome light wiring is kind of a white whale.

    I tracked down the wiring but now I'm more confused. There are three wires going into the overhead front console's dome lights, pink, grey and white. The grey and pink wires are both routed down the driver's side front pillar (where grab handle should be).

    [​IMG]

    White is ground. According to my meter, the grey wire going to the dome lights is always hot, +12V, which makes sense as you can turn the lights on at the dome light switch. The pink is different. When the dome switch next to driver's left knee is ON, the pink wire has no current. When that switch is OFF, the pink wire is +12v. So, that makes the pink wire and the driver's knee dome switch a negative switch, doesn't it?

    The wiring diagram that came with my AOB switches shows wiring for a vehicles with negative ground wiring. If I added a relay and 1 amp diode and wired the pink wire to relay pin 86 as the trigger per AOB's Diagram 2, shouldn't I be able to tie it into the dome light switch?

    Alternatively, if I added a switch and relay and used the grey wire (constant +12V) as the trigger per the AOB Diagram 1, shouldn't that allow me to 1) turn the footwell lights on and off whenever I want to and 2) have them subject to the computer's 20 minute accidentally left interior lights on function?
    [​IMG]
     
    Last edited: Mar 25, 2019
  2. Mar 20, 2019 at 8:28 AM
    #2
    jawjatek

    jawjatek New Member

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    Dome light circuits are an example of a "wired-OR", where the bulb gets +12V, and any number of switches can complete the circuit to ground and make the lamp come on. A pic is worth a thousand words...

    Notice that the only time you would measure +12V on any switch leg is when they are all open (off). In this case you are reading the voltage thru the bulb. If I understand your question right, the pink is connected to the ground side of bulb. Thats why it goes to 0V when the dome switch is ON.
     
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  3. Mar 20, 2019 at 1:54 PM
    #3
    ncorry

    ncorry [OP] New Member

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    I think I'm following you now. When i initially got hte notification that I had a reply, the picture wasn't showing up. It is a lot clearer now....

    So, if I add a relay and use the grey, which is +12V as long as the computer hasn't done the 20 minute time out to interior lights, as the trigger line to the switch as shown in the AOB Diagram 1 above, it should work. I think..... We'll see.

    One thing though- the pink goes to 0 when the switch is turned on. It doesn't go negative.
     
  4. Mar 20, 2019 at 3:43 PM
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    Pudge

    Pudge Super Secret Elite Member #7

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    I tried and tried but ended up wiring to the cargo light wire. I still get a switch to use when I want it, only caveat is if I'm driving at night and turn the switch on, the cargo lights obviously turn on too. It was just too frustrating and time consuming to make it work with the dome circuit
     
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  5. Mar 20, 2019 at 5:36 PM
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    jawjatek

    jawjatek New Member

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    Why would it go negative? There's no negative voltage involved, just 12V and ground. When a switch closes, it grounds the bulb. So it reads 0. Ground.
     
  6. Mar 25, 2019 at 11:38 AM
    #6
    ncorry

    ncorry [OP] New Member

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    I updated the OP. Using the pink wire behind the driver's A-pillar as the trigger for the switch and the +12V for the relay works, and makes the footwell lights turn off with the truck's 20 minute time out. AND I don't have to have the cargo light or the dome light on to use them.
     
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  7. Mar 25, 2019 at 11:55 AM
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    Pudge

    Pudge Super Secret Elite Member #7

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    Nice job. Someone finally did it!!!
     
  8. Mar 25, 2019 at 12:08 PM
    #8
    ncorry

    ncorry [OP] New Member

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    Thank you. I figure I only 12 or so hours in it....
     
  9. Aug 7, 2019 at 8:21 AM
    #9
    av8tor

    av8tor New Member

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    Nice job! Did you by chance check the dome relay to see if it went bad before making this change?
     
  10. Aug 7, 2019 at 8:29 AM
    #10
    ncorry

    ncorry [OP] New Member

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    I'm not following you. I added a relay for the footwell lights and use the dome lights' circuit as the trigger and the source of the+12V. Looking at Diagram 1 in the first post, the diagram's red wire going from the high beam to the switch is now connected to the pink wire in the A-pillar, as is the relay's 30 pin. I never touched the dome relay.
     
  11. Aug 7, 2019 at 10:35 AM
    #11
    av8tor

    av8tor New Member

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    Thank you for the quick reply. I’m sorry, I was thinking you were trying to fix the dome lights to turn on when the door opens. My aren’t working when I open the door, but do when I press the switch and when pressed individually.
     
  12. Aug 7, 2019 at 10:48 AM
    #12
    Ynot_tonY

    Ynot_tonY Merciful

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    So do you have any pictures of where you tapped into? Close up and zoomed out for reference? I plan on adding interior LED's for under my seats and footswells soon.
     
  13. Aug 7, 2019 at 10:59 AM
    #13
    ncorry

    ncorry [OP] New Member

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    I do not. I pulled the front dome light console out and did the testing there until I found that the pink wire was what i was looking for (1st pic in OP). Then I followed that sleeve of wires to the driver's side A pillar and removed it and tapped into it there.
     
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  14. Aug 8, 2019 at 11:29 AM
    #14
    TTund16

    TTund16 New Member

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    Op,
    Is the 20 minutes timer for all interior lights? There is a dome light (center) and there are 2 map lights by the mirror. Does the timer turn all off?
     
  15. Aug 8, 2019 at 11:33 AM
    #15
    ncorry

    ncorry [OP] New Member

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    As far as I know, yes. If the truck is off and keys are out, I believe that the timer will turn off the interior lights after 20 mins regardless of what position the switch by driver's left knee or switch by lights are in.

    On the other hand, it'll take about 21 minutes to test this idea.
     
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  16. Aug 8, 2019 at 12:04 PM
    #16
    TTund16

    TTund16 New Member

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    Did you use DPDT switch to control the footwell lights?
     
  17. Aug 8, 2019 at 12:31 PM
    #17
    ncorry

    ncorry [OP] New Member

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    Nope, just a SPST with an LED light tied into the dash illumination circuit.
     
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  18. Aug 8, 2019 at 10:39 PM
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    TTund16

    TTund16 New Member

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    Your footwell switch just turns the footwell light on? Basically either light is ON or control goes back to the footwell circuit?
     
    Last edited: Aug 8, 2019
  19. Aug 8, 2019 at 10:51 PM
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    TTund16

    TTund16 New Member

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    if he is tapping to the "switch side" of the 12V to trigger the footwell relay, would it be correct to assume that if the bulb is burnt, the 20 minutes timer (trigger) will no longer work!?
     
  20. Aug 9, 2019 at 12:46 AM
    #20
    SpeshulED

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    Can you post a diagram of what you did?
     
  21. Aug 9, 2019 at 7:26 AM
    #21
    ncorry

    ncorry [OP] New Member

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    Yes, the switch for the footwell lights only controls the footwell lights. If I leave the footwell switch on and don't have the domelights switched on, the footwell circuit turns off automatically after 20 minutes.
     
  22. Aug 9, 2019 at 7:31 AM
    #22
    ncorry

    ncorry [OP] New Member

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    See the first post, the picture labelled DIAGRAM 1. Only changes: 1) Red wire from switch plug goes to pink wire in Driver's side A Pilar; 2) #30 pin from relay goes to pink wire in Driver's side A Pilar (same as #1); and #87 pin from relay goes to footwell circuit instead of spot lights.

    The only thing I was trying to accomplish was to have the extra interior lighting controlled by the truck's 20 minute automatic cut off.
     
  23. Aug 9, 2019 at 11:28 AM
    #23
    TTund16

    TTund16 New Member

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    nice job. I assume you meant SPDT.

    What is the dash illumination circuit? I kind of like the idea of LED or some indication when my fog lights are on ... My other cars have a separate LED either on the switch or in the dash indicating when the fog lights are on but Tundra doesn't have it. It's not a big deal but the fog lights are so dim that if the head lights are on, you may forget that the fog lights are on.
    Anyways just curious what you mean by tied into dash illumination circuit.
    Thanks
     
  24. Aug 9, 2019 at 12:22 PM
    #24
    ncorry

    ncorry [OP] New Member

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    Mine (2019) came from the factory with fog lights and when they're on, I've got a light next to the tachometer that lights up. If you've got aftermarket fogs, I don't know what to tell you. My 2011 had OEM fogs with an indicator. My 07 did not (aftermarket).

    Otherwise, the dash illumination circuit is just the little wire going into the back of all of the dash switches that cause the switch to light up brighter when the switch is in ON position.
     
  25. Jan 27, 2020 at 8:29 AM
    #25
    Worriedman50

    Worriedman50 New Member

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    Does that path allow the footwell lights to come on when the door opens, and when the dome light switch is on?
     
    Last edited: Jan 27, 2020
  26. Jan 27, 2020 at 11:17 AM
    #26
    ncorry

    ncorry [OP] New Member

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    I don't know how someone could wire it up for two triggers (the tiny footwell that comes on when the door opens and the 20 minute timeout). I have a switch that controls the LED footwell lights that I installed, a simple on/off rocker. I used the relay tied into the front dome light for one reason only- I know that I am going to leave them on sometime so I wanted the 20 minute timeout to override my rocker on/off switch.
     
  27. Jan 27, 2020 at 12:16 PM
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    Worriedman50

    Worriedman50 New Member

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    Gotcha, thanks for the response.
     
    Last edited: Jan 27, 2020
  28. Feb 10, 2020 at 5:58 PM
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    adaird

    adaird New Member

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    Did you ever figure out what was wrong with your lights? Mine is doing the same thing. The dome and map lights work when I turn the dome switch to "on" but won't work when it's set to "door". Doesn't matter which door is open, none of them trigger the dome lights to come on.
     
  29. Mar 25, 2022 at 6:50 PM
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    athladik

    athladik New Member

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  30. Mar 25, 2022 at 6:56 PM
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    athladik

    athladik New Member

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    I too have an issue with my interior lights not turning on when the doors are open I have checked the fuses but still no lights. I was trying to install led lights in the foot well circuit but accidentally crushed the foot well light I grounded the socket but I replaced the bulb but no lights. I have 12v on the blue wire but when I connect the brown no lights. If I go straight to ground all my lights turn on but unfortunately the switch will not turn them off. There must be something before the ECM.
     

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