Question about 1991 Jeep Cherokee Limited

11 Answers

1991 Jeep Cherokee Headlights

Headlights came on by themselves. The switch was off. Switch would not work to shut them off. I replaced switch to no avail. Pulled the flash-to-pass, security alarm fuse.Now the switch works to turn the lights on and off, but if I put the fuse back in the lights stay on.
Any idea where to look next to fix this problem?

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  • 8 more comments 
  • jadco Jul 11, 2008

    Already put in a new fuse. Makes lights come on (bright) and stay on.

  • jadco Jul 11, 2008

    Link did not help with our problem.

  • jadco Jul 11, 2008

    No square metal box on passenger side. This is a 1991 Jeep Cherokee Laredo

  • jadco Jul 11, 2008

    So are, no luck

  • jadco Jul 11, 2008

    OK, so where do I find the relay??



  • jadco Jul 11, 2008

    Where is the relay??

  • jadco Jul 11, 2008

    Where would I find the relay. I have a chiltons guide but it doesn't show it.

  • jadco Jul 11, 2008

    to Leethedeuce.
    There is no relay for the headlights in that box. Only a large 40 amp fuse, which is OK. We noticed a buzzing sound for about 2 seconds when we turn the headlight switch on.

  • jadco Jul 14, 2008

    Also checked all the grounds. Still can't locate the problem. Does anyone know of a relay for the lights that would be located somewhere besides under the hood>

  • Anonymous Dec 03, 2008

    I had a 99 Ford Ranger that started to do this, I pulled out the headlight switch and noticed that there were some of the wires towards the bottom of the wiring harness were pulled out slightly, sparking from making contact with each other and starting to corrode. So that was what my issue ended up being caused by.

    Main symptoms I experienced was that my headlights would flash every now & then, my battery died rather quickly and often, and lastly my lights came on and wouldnt turn off unless the wires were 'shifted' (kinda like when headphones cut out & you have to fiddle with the wire to try and make a connection.)

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11 Answers

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Wiring diagram symbol for 1988 Jeep Cherokee, containing wiringdiagram changes, are obtained from the domestic and importmanufacturers. These are checked for accuracy and are all redrawn intoa consistent format for easy use. Temp Sense, Battery, Fuel GaugeInstrument Cluster. Again, use the legend on the first page of thewiring
diagram to determine the grid number and letter of the referencedcomponent. You can then turn directly to it without tracing wiresacross several pages. WIRING DIAGRAM SYMBOL IDENTIFICATION, Circuitbreaker, Coil Connector, Diode, Fuse and many more. The great book tocomply your factory service and repair manual book. Download Now !

1991 Jeep Cherokee Headlights - download.jpg
Tags : jeep cherokee, import manufacturers, fuel gauge, grid number, consistent format, circuit breaker, fuse, jeep, accuracy, wiring diagram

Posted on Jul 15, 2008

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Hi,

I am assuming that you have a factory installed keyless entry alarm system. When triggered, it will have the Headlights flashing, car horn honking and a worded SECURITY" light in the dash flashing. It is a box under the dash that says "security alarm" and has the Chrystler logo on it.

In most likelihood, the internal trigger/relay for the headlight has shorted out. The rest of the alarm is OK since if it is the main circuitry, then the headlights would be flashing and not a steady ON.

The technically correct procedure would be to have the alarm checked, repaired or replaced.

A temporary work around is to cut the wire leading to the flash-to-pass switch from the alarm.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 15, 2008

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Sir,

If it's the same as a 1996, you unscrew the top screw for the headlight & then you can unscrew the bottom screw, but I ended up breaking off the brackets because the 2nd screw is located between the headlight & the blinker housing, where there's absolutely no room to put any tools. I had no way to get that 2nd screw off, so you may be lucky to fit your hand in through the top & just untwist the bracket, but it's just easier to take off the housing. I guess a friend got his off by using an allen wrench? The headlight does stay in there just fine even with the brackets broken off on the bottom, just make sure you get the top screw nice & tight.

Thanks
Good luck

"don't forget to rate the solution"

Posted on Jul 11, 2008

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In my experience, if there's ever been a part that I didn't know the location of... I just went to an auto part store and one of the employees always knew what and where it was. They'll even help replace it if they have time.

Posted on Jul 11, 2008

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Check with closed circuits with the help of a professional...

Thank you for using Fixya

Posted on Jul 11, 2008

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When the security system activates, it causes the lights to flash. I'd say the security system has malfunctioned, causing the lights to stay on. You will more than likely have to replace the ecm (control module) for the alarm system.

Posted on Jul 11, 2008

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  • Ryan Rogers
    Ryan Rogers Jul 11, 2008

    If you take the alarm system fuse out and that solves the problem, then you put it back in and the problem is there again, then you've narrowed it down to the alarm system causing the problem, not a relay.

  • Ryan Rogers
    Ryan Rogers Jul 11, 2008

    Please do update us on how the relay did not fix your problem!!

  • Ryan Rogers
    Ryan Rogers Jul 12, 2008

    You test the alarm system control yet?

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  • Jeep Master
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It is a short somewhere in the wiring, or a faulty lights instrument. Possibly get the wiring diagrams for your car, for example buy the haynes book for your model.
Buy also a tester to test your car.
Test the power in the circuits from the instruments to the lights, starting to test the power on the wiring coming to the light switch.
One of the wire should have no power, if it does have there is a short in the wires, if not, as normal, then is the light switch faulty.

Posted on Jul 11, 2008

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It sounds like the relay is the problem not the switch. It is a fairly common problem.
Hope that helps.
Thanks,
Lee

Posted on Jul 11, 2008

  • 5 more comments 
  • Lee A.
    Lee A. Jul 11, 2008

    should be the big plastic box in the engine bay usually, with all the other relays. The part itself is only about 6-10$.
    Enjoy,
    Lee

    also if you found this helpful I would greatly appreciate you accept and rate accordingly as I strive to provide fast,accurate, and economical solutions.


  • Lee A.
    Lee A. Jul 11, 2008

    This definitely sounds like your problem I hope that you found my solution helpful in the least if not FixYa, as I am sure once you replace the relay all should be good.
    Thanks and keep me updated,
    Lee


  • Lee A.
    Lee A. Jul 11, 2008

    Did you look for it on the jeep itself? It should be under the hood near one of the sides. I have a 96 jeep which is the same exact thing basically they changed in 97. I will go take a look and let you know for sure. But they are all together it is the head-lamp relay.
    Thanks,
    Lee


  • Lee A.
    Lee A. Jul 11, 2008

    Ok, I did more research you are right they don't have a relay, just the
    I thought a 20A fuse, If you have 12V at the light socket. Then it
    sounds like you have a ground problem. Check your grounds make sure
    there isn't corrosion etc. Clean them up I think this may be your
    issue. You changed the switch so that is the only other thing that
    would usually cause that. Check your grounds and let me know.
    Thanks,
    Lee

  • Lee A.
    Lee A. Jul 11, 2008

    Is this an after market security system you are referring to? When you pull the fuse then your headlights work? If so check the grounds for your security alarm to. It could be your security alarm causing the problem. You may have to keep it disabled/replace it.
    Let me know.
    Thanks,
    Lee


  • Lee A.
    Lee A. Jul 11, 2008

    http://jeep.larrynova.com/93/IgnitionSwi...
    There is a diagram that may help you to reference as well in the future.
    Thanks,
    Lee


  • Lee A.
    Lee A. Jul 15, 2008

    Need some feedback from the questions I posted. Is this an aftermarket alarm system?
    Thanks,
    Lee


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You sais security alarm you tryed unlocking all the doors with with the key security swicht in the door if it that normally lighy flash day light module in those years im pretty sure they dont have that but its worth a look on firewall passager side sqare metal box good lock pierre

Posted on Jul 11, 2008

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There could be short in the wiring which is causing this problem or loose connector try manual inspection on the wiring the car...
Please use this link:

http://www.autozone.com/addVehicleId,1629101/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152800a9dbc

If you have any problems please let me know ,,


Good luck.......

Posted on Jul 11, 2008

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Try replacing that fuse with a new one.

Posted on Jul 11, 2008

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