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2015 389 Peterbilt

Discussion in 'Trucks [ Eighteen Wheelers ]' started by KittyKicker, Nov 13, 2019.

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  1. Nov 13, 2019 #1
    KittyKicker

    KittyKicker Light Load Member

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    Dec 27, 2015
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    My brake lights stay on when the main instrument cluster is on. If I open the door or have the truck on the brake lights will not go out. If the truck is off and I open the door the dashboard cluster will come on and so will the brake lights. If I push the button in the door jam and hold it, all the lights will go out after a few seconds.
     
    KittyKicker, Nov 13, 2019
    KittyKicker, Nov 13, 2019
    #1
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  3. Nov 13, 2019 #2
    Roberts450

    Roberts450 Road Train Member

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    Is it just like 2 of the diode’s in the led brake lights that come on and very dimly?? I think that’s standard as the 2013 and the 2018 I have now both do this.
     
    Roberts450, Nov 13, 2019
    Roberts450, Nov 13, 2019
    #2
    spsauerland and pushbroom Thank this.
  4. Nov 13, 2019 #3
    pushbroom

    pushbroom Road Train Member

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    Yeah its normal. Lights are not actually on, just dimly back lit.
     
    pushbroom, Nov 13, 2019
    pushbroom, Nov 13, 2019
    #3
    Wheeljack, Roberts450 and spsauerland Thank this.
  5. Nov 14, 2019 #4
    KittyKicker

    KittyKicker Light Load Member

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    Dec 27, 2015
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    No, it is the full brake light, just like if you press the brake pedal.
     
    KittyKicker, Nov 14, 2019
    KittyKicker, Nov 14, 2019
    #4
  7. Nov 29, 2019 #5
    KittyKicker

    KittyKicker Light Load Member

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    Dec 27, 2015
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    Plot twist: the applied brake pressure gauge is reading 50psi with the brakes released. There is no air line that runs to the gauge. The brakes are not actually being applied. Lights are still stuck on.
     
    KittyKicker, Nov 29, 2019
    KittyKicker, Nov 29, 2019
    #5
  8. Nov 29, 2019 #6
    pushbroom

    pushbroom Road Train Member

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    Brake application sensor is probably stuck in range then. Located to the rh of the steering column accessed by the kick panel.
     
    pushbroom, Nov 29, 2019
    pushbroom, Nov 29, 2019
    #6
    spsauerland and KittyKicker Thank this.
  9. Nov 29, 2019 #7
    KittyKicker

    KittyKicker Light Load Member

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    Dec 27, 2015
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    Do you know what it looks like? Could that be what is making the brake lights stay on?
     
    KittyKicker, Nov 29, 2019
    KittyKicker, Nov 29, 2019
    #7
  10. Nov 29, 2019 #8
    Goodysnap

    Goodysnap Road Train Member

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    Should be a 3 wire pressure transducer. There will be many down there all the same. Harness/connector should be labeled. Transducers will be the same so you can swap to test.
     
    Goodysnap, Nov 29, 2019
    Goodysnap, Nov 29, 2019
    #8
    KittyKicker, pushbroom and spsauerland Thank this.
  11. Nov 29, 2019 #9
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Try turning your main power switch off for like 5 minutes.

    Let the chassis controller reboot.
     
    Dave_in_AZ, Nov 29, 2019
    Dave_in_AZ, Nov 29, 2019
    #9
    KittyKicker Thanks this.
  12. Nov 29, 2019 #10
    KittyKicker

    KittyKicker Light Load Member

    196
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    Dec 27, 2015
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    Could that also be the reason why the brake lights won't turn off?
     
    KittyKicker, Nov 29, 2019
    KittyKicker, Nov 29, 2019
    #10
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