2012 ProStar W/Cummins no brake lights

Discussion in 'International Forum' started by area1509, Nov 27, 2013.

  1. area1509

    area1509 Bobtail Member

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    Mar 1, 2010
    Phoenix, AZ
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    Well with the key in the on or acc position the brake lights work some times but hears the kicker with the key in the off position they work fine?? OK i'm stumped.
    any ideas please post.

    other problems I can live with.
    ESC on the display and triangle seem to be permanently on flashing from time to time.
    the eight square lights four to the right and left of the display don't work.
    the four gauges on the right seem to get tired and shut off every now and then but usually come back on within a few minutes.

    any questions please ask as the brake lights are pretty important to me and those behind me.
    thanks A.J.
     
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  3. luvtotruck

    luvtotruck Road Train Member

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    Jul 30, 2013
    Phoenix Arizona
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    A.J. I'm not sure what to tell you, sounds crazy, Those brake lights will get you an OOS! Right where you sit! Take it to a dealer.
     
  4. baha

    baha Road Train Member

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    Jul 25, 2013
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    start at fuse box, pull and clean all ck brake light switch under dash 2 wire switch,ck ground wire con. lower firewall.l
     
  5. BuckeyeCowboy63

    BuckeyeCowboy63 Medium Load Member

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    May 28, 2013
    Cincinnati, OH
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    Sounds like similar problem im experiencing with my headlights. Have been told that my ground fault interrupter is going out...might check that too....im limited to day driving till i get to terminal.
     
  6. Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    It is actually a rather complicated brake switch and circuit. The switch has a zener diode and resistor in it. The circuit works differently between key on and key off. It is probably the switch, but you should have someone hook up to it to see what input voltages the body controller is seeing.
     
  7. darkknight82

    darkknight82 Bobtail Member

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    Nov 8, 2013
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    circuit diagrams are the attachments
     
  8. area1509

    area1509 Bobtail Member

    41
    5
    Mar 1, 2010
    Phoenix, AZ
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    Where is that switch located?
     
  9. Heavyd

    Heavyd Road Train Member

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    I believe it is buried behind the cluster in the dash.
     
  10. AndyKang

    AndyKang Bobtail Member

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    Oct 16, 2019
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    Did you ever find a solution to this boss?
     
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