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Fog lights weren't working, now work as anytime fogs

Discussion in 'Lighting' started by Ericsopa, Jul 19, 2019.

  1. Jul 19, 2019 at 7:11 PM
    #1
    Ericsopa

    Ericsopa [OP] Old man and the sea

    Joined:
    Nov 7, 2015
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    #2069
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    First Name:
    Mike
    N of Rio Grande, S of Red, E of Pecos, W of Sabine
    Vehicle:
    2013 Tundra CrewMax TRD Ltd Super Duper White OVtuned
    I don't drive a whole lot at night, but coming home last night I noticed that my fogs aren't working. They're both out. Installed SuperNova V4 LEDs back in early March and they've been working just fine. So I'm not sure what the problem is now. I checked the fuse, and it's good. Even swapped it out with another 15A, just to make sure. Swapped out the relay, too. So tomorrow, guess I'll get down by the lights and check the wiring with a volt meter. Anything I'm missing here?
     
  2. Jul 21, 2019 at 4:04 PM
    #2
    Ericsopa

    Ericsopa [OP] Old man and the sea

    Joined:
    Nov 7, 2015
    Member:
    #2069
    Messages:
    1,501
    Gender:
    Male
    First Name:
    Mike
    N of Rio Grande, S of Red, E of Pecos, W of Sabine
    Vehicle:
    2013 Tundra CrewMax TRD Ltd Super Duper White OVtuned
    Well, the fog light relay gets its 12 volts from the tail light relay. When the headlights are on low beam, the fog light switch on the turn signal stalk grounds a terminal on the Main Body ECU, which in turn grounds the fog light relay to cause it to close and turn on the fog lights. I've jumped the terminals where the fog light relay is plugged in and the lights work. There appears to be no ground signal at the relay coil with the tail lights on, so I'm next going under the dash to check the wiring on J3 and J4. One of the wires going those two plugs is not providing a ground (slot 28, J3 or slot 4, J4). In any case, I'm thinking about removing those two wires and splicing them to have anytime fogs controlled by the fog light switch (switch will provide direct ground to the fog light relay, bypassing the main body ECU). Stay tuned.
     
  3. Jul 24, 2019 at 10:45 AM
    #3
    Ericsopa

    Ericsopa [OP] Old man and the sea

    Joined:
    Nov 7, 2015
    Member:
    #2069
    Messages:
    1,501
    Gender:
    Male
    First Name:
    Mike
    N of Rio Grande, S of Red, E of Pecos, W of Sabine
    Vehicle:
    2013 Tundra CrewMax TRD Ltd Super Duper White OVtuned
    Mission accomplished. I've depinned the two wires and spliced them together. The pink wire in J3 terminal 28 and the sky blue wire in terminal 4 of J4 have been depinned and spliced together. The fog lights now work anytime and are controlled by the fog light switch on the turn signal stalk. The only other requirement for them to work is that the "parking" lights and tail lights are on. The effect on the front lights is essentially the same as the DRLs being on along wth the fog lights.
     
    NewImprovedRon likes this.

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