Question about 1996 Jeep Cherokee

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All the light are out in the front as well as the head lights. I have not change the bubs. Also the bright lights, Light on the dash is on and wont go off when the light swich is on. I wont to find out what the problem is befor changing bubs in case there is something larger going on.

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  • lmeachum1 Mar 06, 2009

    All the lights are out in the front. I have just check one of the head light and it looks OK. I also check the power going to the head light ( the conintion behind the headlight) and there is no power there9No power geting to the head lights) I have the haynes repair manual but it is not showing a lighting control module. That is way I am stuck.

  • lmeachum1 Mar 06, 2009

    Let me add it is just the light in the front . the lights come on in the back OK.

  • lmeachum1 Mar 06, 2009

    The high beam ind. on the dash bord is on. I was looking at the wiring diagram (haynes) and this come from the dimmer swich.and also the rear light come on. That is what where the wiring diveds between the front and back. I am thinking that that may be the problem if the drawing is wright.

  • lmeachum1 Mar 06, 2009

    Did that befor I even post. everthing is good. everthing seems to led back to the dimmer swich. At list per the Haynes repair manual. At lest that is what I am seeing. Does that sound wright ? I am lost here.

  • lmeachum1 Mar 10, 2009

    At this time I have order a dimmer swich. I will leave this open untill I fix the problem.

  • lmeachum1 Mar 30, 2009

    The problem was not fix. So let me fill you in on what I have done.
    None of the lights work on the front of the car. the light do check ok. the fused check ok. and per the haynes repair manual wiring drawings the dimmer switch in the multi-function switch lever is where it saperates to the front and the back light {wich do work}. I replaced this switch and this did not help. I can not find the problem. Is there a inline fuse or something that can keep the head light from not working?

    Also my trun single are not working now and they where when I starded trying to find the problem.

  • lmeachum1 Mar 31, 2009

    I do have power to the dimmer swich. but to tell the truth I am getting lost in the wiring. haynes wire diagrams don't cover wich wires do what coming out of the wiring harness. So I am getting some local help today. and I also order a dealer service manual. {found one on ebay used} I will post here to let you know what happens.

  • lmeachum1 Apr 01, 2009

    1st shop though in the towl. But All the grounds are good . I found other shop that says they can find and fix it. and unlike the other shop they have real wiring digrams. Which give me hope. The problem is in the wiring harness.

  • lmeachum1 Apr 01, 2009

    The lights are fix!!!!!

    there was a wiring harness plug below the air box that shorted out. The shop that found it also though that it was the multi-function switch also but they when back and check this one connection. and found the problem.

  • Richard Scordino May 11, 2010

    One question...has anyone checked the bulkhead connector to make sure the power under the dash is getting past the firewall? (lots of people ignore the connector because it's a pain to remove.

  • Richard Scordino May 11, 2010 answer when you find it...I keep going back and trying to find something helpful for you even when I'm not writing, It's annoying because likely I could locate your problem in a really short time if I was there!!!

  • Richard Scordino May 11, 2010

    When you determined that the dimmer switch was faulty, did you check to see if power was present going into it as I suggested?
    I looked at a haynes manual after reading your posts, and found no less than five different diagrams (all listed as "typical" but not one specific...why I love haynes so much). Depending upon actual date of manufacture, you may have a wiring setup for a 1997 vehicle. They show four for that. Which one you have is anyones guess.
    Where I would go from here would be to first check every fuse & fusable link in the system (regardless of where they go) Make certain that there is a really good, clean ground on the engine block, fenders and dashboard. Check the actual light switch and make sure there is power going there. If not, trace that wire to it's source and find out why. Once you have power at the switch, then, find the wire(s) that come from the headlights and trace them to their source (or 'till you find a problem) Whatever relays, modules etc. that you encounter must have power going into them and coming out (with the lightswitch on). Check each component for proper grounding as well (if component has a ground lead connected to the body, or a ground wire in the harness going to it) When checking harnesses, most times it's not necesary to cut them open...(9 of 10 times you can identify a wire at one end and just do a continuity test at the other end to see if it's good...most wires don't fail in the middle unless there is burning or a body part has sawed through it) One exception is if a branch wire joins a wire and serves a failed component outside the system you are working on...not likely in a lighting system) An important place to check is at the bulkhead connector where the wiring main harness passes through the firewall. Connections often break down there.
    I know it is a painstaking process to check all wiring but, you haven't had lights for nearly a month. Time to start digging!
    Write down what you test to avoid tracing the same wire twice.

  • Richard Scordino May 11, 2010

    In ordering the dimmer switch, I assume that you found power at the dimmer switch (tan wire?) and nothing coming out of the switch. Is this correct?

  • Richard Scordino May 11, 2010

    Thats why it's difficult from here...I didn't see you check fuses. Well, it's worth a try...Check power into/out of dimmer switch before just buying one though. (I really hate seeing people buying stuff then finding out the problem is somewhere else!) I believe its up on the column under the dash on that one.

  • Richard Scordino May 11, 2010

    Also check any fuses/relays in power distribution center near battery Items are labeled inside cover.

  • Richard Scordino May 11, 2010

    Haynes has probably the worst diagrams I've ever seen 30 yrs in business, was a "go to" person in electronics and most times their diagrams don't show anything I need (even when I'm looking right at the part) They show an ignition module for my jeep (I don't have one) The colour codes for everything is wrong, regardless of what I'm working on etc.....I usually wind up tracing wires till I find what I need. (someday I'll get a dealer service manual or a chiltons..both are a bit expensive but at least their stuff is correct) Someone here likely has one and knows where they hid it!!! In the meantime, see if you have power to light and dimmer switch.

  • Richard Scordino May 11, 2010

    It is possible that all lights can go out, but unlikely. Check at least one bulb and see if it's OK. If it is I'd look to see if you have a lighting control module. Quite possible that's where problem is.



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This one problem makes a strong case for teleportation!!! I really hate working by remote control. All along I had a strong feeling that this was something really easy, that just got overlooked. Your problem got solved by a tech that really cares about his work and dosen't skip steps or give up!!! He should get more of your business!!!
Good luck!!!!

Posted on Apr 01, 2009


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