Brake lights won't work...03 Tacoma

Discussion in '1995 - 2004 Toyota Tacoma' started by skizman, Sep 22, 2018.

  1. skizman

    skizman Member

    All 3 brake lights won't come on, but all other lights work. This is what I did.
    Replaced the brake light switch...
    Replaced tail light relay under hood in fuse box...
    Checked and replaced tail and brake light fuses under hood and under dash.
    Tried different bulbs...
    Checked ground wire under bumper.
    Unplugged brake light switch plug and checked with multimeter, checked all contacts with probes and there was no voltage.
    Help!!!!!!!!!!! I have no idea what to try next.
    Brake lights always work without ignition on. Not now.
     
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  3. OR17TRD

    OR17TRD Well-Known Member

    Seems like you’ve tried everything. Does it work when the truck is on?
     
  4. Crawdad

    Crawdad Well-Known Member

    Do you have voltage at the switch?
     
  5. Lil G

    Lil G Well-Known Member

    Ground wire?I also saw on a frontier behind the brake pedal there is a plastic piece that works the brake switch that is on the fire wall behind the brake pedal. See if the taco is rigged up the same way. Just trying to help I’m sure it’s something small
     
  6. Lil G

    Lil G Well-Known Member

    Just re read you had checked everything I said sorry dude
     
  7. Crawdad

    Crawdad Well-Known Member

    I misread what he wrote too,..... ok, was there voltage in the fuse box? It should if anything does... power at relay? Connections? Find the voltage and trace it. Could be something as silly as a connector rattling loose.
     
    Last edited: Sep 22, 2018
  8. Lil G

    Lil G Well-Known Member

    I’m thinking it has to be something small and stupid we are over looking and over thinking
     
  9. OP
    skizman

    skizman Member

    No.
     
  10. OP
    skizman

    skizman Member

    I pulled the relay and crossed a couple terminals with a wire and running lights came on. That's all I could get crossing terminals.
     
  11. OP
    skizman

    skizman Member

    You mean brake light switch? I tried testing the plug with a meter and found no voltage.
     
  12. Lil G

    Lil G Well-Known Member

    It should have voltage coming to it for sure.
     
  13. kp.taco

    kp.taco Well-Known Member

    Could be a short in the trailer wiring harness. I'd start there.
     
    Lil G likes this.
  14. Crawdad

    Crawdad Well-Known Member

    Here's a very simple wiring diagram of brake lights, not specific to an 03 tacoma but hopefully this helps. So again, I'll ask, was there power coming into the switch on the pedal? (Separate power source) (find a good grounding point for negative lead, touch positive lead to either terminal on the switch, should get 12v?) Is your meter set to the correct setting? 20180923_082037.jpeg
     
    kp.taco likes this.
  15. Lil G

    Lil G Well-Known Member

    Test light if you don’t have a 12 volt meter
     
    Crawdad and kp.taco like this.
  16. Crawdad

    Crawdad Well-Known Member

    I have an incredibly old one but I wouldn't be afraid to spend six bucks on this one. 20180923_095450.jpeg
     
  17. Lil G

    Lil G Well-Known Member

    Test lights are cheap harbor freight is where I get them .
     
    OR17TRD likes this.
  18. OP
    skizman

    skizman Member

    I'm not getting any voltage out of the plug on the brake light switch. I've rechecked the fuses again. I have no choice but to take it to a shop. I've done all I could. Thanks.
     
    OR17TRD likes this.
  19. OR17TRD

    OR17TRD Well-Known Member

    Bummer. Let us know what it ends up being.
     
  20. mcodyv

    mcodyv Member

     

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