Brake light assistance

Discussion in 'KJ General Discussion' started by Awwphooey, Aug 1, 2019.

  1. Awwphooey

    Awwphooey New Member

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    Hi Folks-

    I'm at work here trying to help a colleague solve her brake light issue (I'm a Ford guy myself -no disrespect no disrespect!!! ;P ).

    She has an '07 Liberty, brake lights not activating when brake pedal pushed. Checked her 7 and 9 fuses, they were fine. Then decided to pull them all just for kicks, all fuses were fine. Changed out the bulbs, no difference (original bulbs were fine also). Went down to O'Reilly and bought a new brake switch, crawled under and installed, turned the little lever, and still nothing. Plunger comes fully out. Anything else I should be considering?

    Thanks in advance for the help everyone :)

    Phoo
     
  2. Billwill

    Billwill Full Access Member

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    You need to check if +12 volts is getting to the contacts inside the globe holder with respect to chassis and also with respect to the ground inside the socket..when brake pedal is depressed.

    Does the third brake light up high light up? This takes a slightly different path.

    Did you replace the whole brake switch assembly....the existing assembly cannot be removed and put back in place again!

    The rear brake/light sockets on the KJ are known to overheat and melt themselves into the plastic so they no longer make contact with the bulbs.

    The 2007 Wiring diagrams are pretty much impossible to get hold of but the 2006 Wiring diagram should be close enough although wiring colors will probably be different.

    You can download the 2006 Jeep Service Manual here...section 8W has the wiring diagrams.

    www.colorado4wheel.com/manuals/Jeep/KJ/

    Edit: don't know why this link is not working now?
     
    Last edited: Aug 2, 2019
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  3. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

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  4. Billwill

    Billwill Full Access Member

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    Thanks for fixing the link...I do not usually need to put the http:// garbage in!;)
     
  5. Awwphooey

    Awwphooey New Member

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    Thanks for taking the time to respond, much appreciated.


    You need to check if +12 volts is getting to the contacts inside the globe holder with respect to chassis and also with respect to the ground inside the socket..when brake pedal is depressed.

    (Ok, will give that a try)

    Does the third brake light up high light up? This takes a slightly different path.

    (No)

    Did you replace the whole brake switch assembly....the existing assembly cannot be removed and put back in place again!

    (Yes, replaced it with new)

    The rear brake/light sockets on the KJ are known to overheat and melt themselves into the plastic so they no longer make contact with the bulbs.

    The 2007 Wiring diagrams are pretty much impossible to get hold of but the 2006 Wiring diagram should be close enough although wiring colors will probably be different.

    (I’ll also search for it)


    Thanks again, will keep you posted!
     
  6. Awwphooey

    Awwphooey New Member

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    Oh, i didnt scroll down and missed the linbk. Coffee just now starting to kick in. Thanks guys.

    So was just thinking, if the top brake light is also not working, this would seem to indicate a different cause, no? I'll still go out and try the sockets.

    Everyone at work got a kick out of seeing me underneath and upside down, crammed under the steering column. My neck is killing me this morning. ;D
     
  7. Ray A

    Ray A New Member

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    Circuit
    The circuit boards in the tail light assemblies were my problem when my brake lights didn't work when the headlights were on. It's worth a check.
     
  8. Awwphooey

    Awwphooey New Member

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    Ok, update. The one thing I didn’t check when diagnosing was the high brake lamp. I just assumed it was on the same circuit as the bottom brake lamps and thus why it wasn’t lighting. I opened that up and indeed the bulb was burnt out. Replaced it and high brake lamp is fine. So here’s where I sit:


    Checked all under dash fuses, all were fine.

    Changed all the bulbs.

    Put in a brand new brake switch.


    At this point the tail lights work, the high brake light works, but the regular brake lights do not.

    I did consider trying to exchange the circuit board, but it looks like they are only sold separately for the 2008 and higher. Nothing available for the 2007, guessing it’s because you have to by the whole assembly. At this point though, doesn’t seem it would be the circuit board. I did check the contacts for the brake lamps, and they are in fine shape.

    At a loss here, going into wiring is a bit beyond my abilities, going to send her to an auto electrical shop. Unless there is anything else you folks suggest to check?


    Thanks in advance, again.

    Phoo
     
  9. Awwphooey

    Awwphooey New Member

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    You need to check if +12 volts is getting to the contacts inside the globe holder with respect to chassis and also with respect to the ground inside the socket..when brake pedal is depressed.

    (Forgot to check that BillWill, thanks!)
     
  10. Billwill

    Billwill Full Access Member

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    If you are not getting +12 volts at the actual contacts inside the bulb sockets with respect ground then you need to trace the correct colored wires back towards the front of the Jeep to see where the voltage goes missing.

    Make use of the 2006 Jeep KJ Service manual...section 8W. Other than wiring colors the layout should be about the same as will be the fuses inside the cabin and under the hood.

    You can trace the status of these wires going from the front to the rear..sometimes through connectors inside the cabin. Tape a pin/needle to one of your meter leads and you can then jam down the brake pedal and pierce the wire that you tracing and check if +12 volts is there with respect to ground and hopefully find where it goes missing...fix up the hole in the insulation with some glue.;)

    I will try to post the relevant pages from the 2006 manuals wiring section and maybe we can go over it together!

    OK I do not think that the wires go through the rear tailgate area...I was thinking of another problem so I have deleted that statement to reduce any further embarresment!;)

    The wiring diagrams are full of errors and the 2006 wiring diagrams got a lot worse then the previous years...other than the fact that the rear right and left brake lamps get their power through a certain connector pin which may be dirty there is not too much difference to the high-level brake light.

    I still think the problem is in the actual rear bulb-socket area...you need to really check if voltage is on the leads going to the socket pins themselves. I am clutching at straws here because I live and breath at having the correct wiring diagrams in front of me and at this stage this is not happening...cannot find a "free" 2007 KJ Wiring diagram!:mad:
     
    Last edited: Aug 3, 2019
  11. Jeremy-WI

    Jeremy-WI Full Access Member

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    Do the 4 way hazzard lights work? I think the regular brake lights go through that circuit and the center high brake light bypasses the hazzard switch
     
  12. Billwill

    Billwill Full Access Member

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    The 4 way hazard switch only lights up the turn signals...not the brake lamps...so the hazard switch is not relevant here...unless things changed with the 2007 model!
     
  13. Jeremy-WI

    Jeremy-WI Full Access Member

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    I guess I am still used to chevy's
     
  14. Leeann

    Leeann Full Access Member

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    It's not that - the last o in Colorado is missing in the actual link, not in the bold type ;)
     
  15. Billwill

    Billwill Full Access Member

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    I do not quite follow you Leean...I have often used that link without problems and my post shows all the "o"s in the correct place.

    I posted that post early in the morning here so had not even started on the Red Wine yet!;)

    Edit to add: OK I see now in the actual link the missing "0"....don't know where that went to!

    No problem.
     
    Last edited: Aug 5, 2019
  16. Leeann

    Leeann Full Access Member

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    Beats the hell outta me! I didn't know you could have different text showing vs. the actual link, at least not on this forum.
     
  17. J33Pfan

    J33Pfan Full Access Member

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    Some after market bulbs dont fit properly or touch all the needed contacts in the socket. check for volts in the socket.

    Sometimes the wrong bulb is installed and everybody else looks at the wrong bulb and installs a New wrong bulb instead of the correct bulb.
     
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