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Low beam not working

Discussion in '2nd Gen. Tacomas (2005-2015)' started by adubbs77, Aug 12, 2021.

  1. Aug 12, 2021 at 12:04 PM
    #1
    adubbs77

    adubbs77 [OP] Member

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    My driver side low beam headlight went out, put in new bulb, no fix. Checked the connector with a multimeter, the high beam is reading 12 volts roughly, low beam connector nothing. I dont see any debris or rust on terminal inside connector housing. Fuses are good to go, any quick fixes on this?
     
  2. Aug 12, 2021 at 12:19 PM
    #2
    b_r_o

    b_r_o Gnar doggy

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    Not really any quick fixes. You'll need a wiring diagram to trace back and see where you have (and don't have) power
     
  3. Aug 12, 2021 at 5:24 PM
    #3
    Philrab

    Philrab Curator of useless knowledge

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    Assuming you have low beam and high beam relays, swap them and check. Easy way to rule them out, and a cheap fix if that’s the issue.
     
  4. Aug 12, 2021 at 5:49 PM
    #4
    davidstacoma

    davidstacoma Friendly Curmudgeon

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    Are you sure you checked the right fuse?
    There are 4, one for each high beam, 1 for each low beam per this schematic:
    E46D75EC-CDB1-46CD-8378-49AEA55D48F1.jpgD7EE468F-96B8-4A0F-B64F-0F189F80559D.jpg
    Here’s the full headlight wiring diagram so you can see the relays as well:
     

    Attached Files:

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  5. Aug 12, 2021 at 11:43 PM
    #5
    Jimmyh

    Jimmyh Well-Known Member

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    The power source for the low and high beams all come from the Headlight Relay and get separated at the DIM Relay. So if one of the Headlights work on DIM and the other doesn't it is an issue down stream of the Headlight and DIM Relays. The only things downstream is the wires, bulb sockets and the fuses.

    I suggest rechecking the fuses ( all four ) with a meter.

    The money says a blown fuse for that position that isn't working.
     
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  6. Aug 13, 2021 at 9:08 AM
    #6
    Sprocket1505

    Sprocket1505 Well-Known Member

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    does sound like a fuse or relay issue. before you buy new relays, just bypass them and see if they work. Process of elimination
     
  7. Aug 13, 2021 at 10:11 AM
    #7
    Dm93

    Dm93 Test Don't Guess

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    They are both fed off the same relay so if one side works and the other doesn't it can only be a fuse, wiring, or bulb.
     
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  8. Aug 13, 2021 at 10:25 AM
    #8
    Sprocket1505

    Sprocket1505 Well-Known Member

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    Start from the source and check everything in between. Where where you have voltage and the voltage stops, that’s you issue. Could be a broken wire, don’t know. Trace it out with your meter and find out why the power is not getting to the lights.
     
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  9. Aug 13, 2021 at 10:33 AM
    #9
    Dm93

    Dm93 Test Don't Guess

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    I will add if it comes down to poking wires to check for power make sure to seal up your poke holes with a little liquid tape.
     
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  10. Aug 13, 2021 at 11:17 AM
    #10
    Sprocket1505

    Sprocket1505 Well-Known Member

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    for sure, he replaced the bulb already, fallow the wire and find the issue.
     
  11. Oct 12, 2021 at 12:19 PM
    #11
    Jab-dough

    Jab-dough New Member

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    Dealing with same issue. Replaced bulb, replaced fuse and then found no voltage going to the plug. Interested to see if you found a fix and I'll post when I get it figured out.
     
  12. Oct 12, 2021 at 1:23 PM
    #12
    adubbs77

    adubbs77 [OP] Member

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    I ended up switching the high and low beam electrical feeds in the bulb harness. I don’t have a high beam now but do have a low beam. A lot of troubleshooting in the wiring, harnesses, fuses, etc. and that’s the only half-ass fix I could come up with.
     
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  13. Oct 12, 2021 at 1:35 PM
    #13
    Jab-dough

    Jab-dough New Member

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    Never thought of that. Good idea if I can't figure it out. Thanks.
     
  14. Oct 13, 2021 at 2:47 PM
    #14
    Jimmyh

    Jimmyh Well-Known Member

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    What is hard about following a wire backwards from the socket to find the real problem area?
     
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  15. Feb 18, 2025 at 8:26 AM
    #15
    blairrad

    blairrad Yoter

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    How does an adult misspell “follow”?
     
  16. Feb 18, 2025 at 2:29 PM
    #16
    Pigpen

    Pigpen My truck is never clean

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    Auto correct, maybe?
     
  17. Feb 18, 2025 at 3:43 PM
    #17
    Sprocket1505

    Sprocket1505 Well-Known Member

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    Wow, you felt like you had to interject and call me out for misspelling a word that was probably caused by auto correct. Well, I hope my mistake made your day, so you can call me out and help you feel better about yourself. You should ask your therapist why you think you feel like you had to do that. How do you trust an adult narcissist. I hope your life gets better.
     
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  18. Feb 18, 2025 at 5:39 PM
    #18
    ABA180

    ABA180 It burns when I pee....

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    Though they did dig up a 4 year old thread to follow you, how nice..
     
  19. Feb 18, 2025 at 6:34 PM
    #19
    davidstacoma

    davidstacoma Friendly Curmudgeon

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    lol nice, I missed that!
     
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  20. Feb 18, 2025 at 8:35 PM
    #20
    Sprocket1505

    Sprocket1505 Well-Known Member

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    Must have been waiting for his chance and realized he missed it by a few years. Better late than never.
     
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