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Fog light mod--lights randomly come on now?

Discussion in '3rd Gen Tundras (2014-2021)' started by Bear, Oct 30, 2016.

  1. Oct 30, 2016 at 8:43 PM
    #1
    Bear

    Bear [OP] Fargin' Iceholes

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    PC 6" Stage II; Fuel Beast 18x9 +1mm...lights n stuff
    Howdy all! Followed the Anytime Fog Light Mod 14+ posted here on the site.

    The good: Fog lights now stay on with High Beams. Cool...annnnd low beams....cool....annnd parking lights. Cool.

    The bad: after the truck had been shut down for roughly 20-30 min? The damn lights come on on their own!! Yep. You read that right.

    20-30 min after turning everything off, the truck, sitting perfectly quiet in the driveway lights up like a Christmas tree. I'm monitoring to see if they extinguish on their own as well, but this is rather concerning. Lol

    Any thoughts from the experts??
     
  2. Oct 30, 2016 at 8:46 PM
    #2
    Bear

    Bear [OP] Fargin' Iceholes

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    Of note, if I unlock the truck with the FOB, the lights go out. This was at 2146hrs. Going to see how long it takes for them to come back on
     
  3. Oct 30, 2016 at 8:57 PM
    #3
    Bear

    Bear [OP] Fargin' Iceholes

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    That's what I just did. It's bedtime. So I killed the neg terminal. Deal with it tomorrow. There were no relays to deal with. Just a quick cut and splice. Guess I'll be unsplicing tomorrow. Grrrr
     
  4. Oct 30, 2016 at 9:14 PM
    #4
    MotoTundra

    MotoTundra The Ocho

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    -TRS Mini D2S Retrofit on TRD Pro Headlights (Apollo 2.0 Shrouds, 35w XB Ballasts, 5500k Bulbs) -Baja Designs Squadron R Sport Aux lights. -TRD Pro Grill -TRD Rear Sway Bar -BakFlip VP Tonneau w/BakBox -Dipped wheels & bumpers -Iron Cross HD steps -Undercover Swingcase -SunTek Paint Protection film -Tinted glass -Bedmat -OEM Towing Mirrors
    I haven't checked out the DIY but I hope this is mentioned in there.
     
  5. Oct 30, 2016 at 9:18 PM
    #5
    csuviper

    csuviper Moderator Staff Member

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    Some Mods :) See build thread for details
    No issues with my 2012 after the fog light mod.....that I know of
     
  6. Oct 30, 2016 at 9:30 PM
    #6
    TXRailRoadBandit73

    TXRailRoadBandit73 RUNNIN' WITH THE DEVIL AND THE TÜNDRA CRÜE

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    No prob on mine..
    I followed instructions to the T...hope u get it right
     
  7. Oct 31, 2016 at 5:34 AM
    #7
    Bear

    Bear [OP] Fargin' Iceholes

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    PC 6" Stage II; Fuel Beast 18x9 +1mm...lights n stuff
    No LEDs. Just the wire mod.

    So this morning I went out and reconnected the battery. Started the truck, turned on all the lights for a few minutes then shut everything down. All the lights went out, as advertised.

    A timer was set.

    At 21 min, almost to the second, the fog lights came on by themselves.

    As soon as I opened the door, the interior lights come on and the fog lights go out.

    Asking the experts here: Is there some kind of weird diagnostic process going on here? Why would power be turned on to anything on the vehicle after 21 mins?? Curious. Hmmmm
     
  8. Oct 31, 2016 at 6:08 AM
    #8
    MotoTundra

    MotoTundra The Ocho

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    The EVAP system for emissions turns on and off at a schedule that varies or I can't figure out.
     
  9. Oct 31, 2016 at 8:07 AM
    #9
    TundraTex

    TundraTex FRAC On!

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    I haven't looked at the mod specifics yet, but I'm assuming the mod involves either ground or 12v signals to the computer. If this is the case, and if cut wires are left open, there may be impedance unbalance triggering the fog light function in the computer.

    Did you leave the fog light switch on? You might also try turning off the fog light switch when you park. It's hard to see how the computer would ever turn on the fogs if the switch is off.
     
    GNTundra likes this.
  10. Oct 31, 2016 at 6:05 PM
    #10
    Bear

    Bear [OP] Fargin' Iceholes

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    Well, in this mod, there are actually 2 wires that are left "open". They both appear to be coming from the connector side of the equation. For the record, the fog light on/off switch on the column does nothing now. Hmmm. I.e., can't turn the fog lights off separately when the headlights are on.


    Will have to go back at it tomorrow when I have daylight. Possible I'm not getting a good connection on the splices?
     

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