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Unread 08-19-2012, 03:51 PM   #1
jrc0109
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2007 KJ Liberty 
 
Join Date: Aug 2012
Location: Wayne, NJ
Posts: 4
2007 Headlight wiring problem

My friends 2007 Liberty 4 cylinder driver side headlight went out. It was replaced but still did not work. Mechanic says it is the fusebox and has to be replaced for $800. Can that be correct? Is there an easier fix?


Last edited by jrc0109; 08-19-2012 at 07:36 PM..
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Unread 08-20-2012, 08:12 AM   #2
Billwill
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Quote:
Originally Posted by jrc0109 View Post
My friends 2007 Liberty 4 cylinder driver side headlight went out. It was replaced but still did not work. Mechanic says it is the fusebox and has to be replaced for $800. Can that be correct? Is there an easier fix?
Is the dipped beam working?

The fuses are all in the fuse panel inside the cabin.....check them out...the owners' manual should tell you which fuses are for the lights.

There is no way a whole fusebox can be so faulty...when there is only this one fault.....that it needs replacing. This "Mechanic" is a rip-off artist.

You need to put a voltmeter onto the light fitting to see if there is +12 volts there and a good ground on the housing.

I am not familiar with the lighting system used in the USA...I know it is different to what we have on the Export KJs. Here we have one very small light for "Park" or "Running" lights and then we have a single H7 bulb with both main and dipped filaments inside. What system do you have?...one bulb with both filaments inside or two seperate bulbs?
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Unread 08-20-2012, 10:11 AM   #3
JeepCares
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Here's some info from the 2007 KJ Service Manual:

DIAGNOSIS AND TESTING - LAMPS/LIGHTING - EXTERIOR
WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.
NOTE: When diagnosing the exterior lighting circuits, remember that high generator output can burn out bulbs rapidly and repeatedly; and, that dim or flickering bulbs can be caused by low generator output or poor battery condition. If one of these symptoms is a problem on the vehicle, be certain to diagnose the battery and charging system, then repair as necessary.
NOTE: A good ground is necessary for proper lighting operation. If a lighting problem is being diagnosed that involves multiple symptoms, systems, or components, the problem can often be traced to a loose, corroded, or open ground.

The lamps and the hard wired circuits between components related to the exterior lighting system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the exterior lighting system or the electronic controls or communication between modules and other devices that provide some features of the exterior lighting system. The most reliable, efficient, and accurate means to diagnose the exterior lighting system or the electronic controls and communication related to exterior lighting system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

CONDITION: ONE HEADLAMP DOES NOT ILLUMINATE

Possible Cause Ineffective or missing fuse.
Correction Test and replace headlamp fuse if required.

Possible Cause Ineffective or missing bulb.
Correction Test and replace headlamp bulb if required.

Possible Cause Ineffective ground circuit.
Correction Test and repair open headlamp ground circuit if required.

Possible Cause Ineffective feed circuit.
Correction Test and repair open headlamp low beam, high beam, or DRL relay output circuit if required.
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Unread 08-26-2012, 07:24 PM   #4
jrc0109
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Sorry I have not gotten back to both of you - I have not seen my friend so I have not been able to tty anything yet. Hopefully this coming week. I do not know what a dipped beam is. There is only only one bulb with two filaments.
Thanks.
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Unread 08-26-2012, 07:35 PM   #5
tjkj2002
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What country does your friend live in?

Have to ask as they can not live in north america with a '07 KJ and a 4 cylinder as none made for the north american market as that would be a CRD.Kinda need to know the correct year and such for the correct wiring.
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Unread 09-03-2012, 04:06 PM   #6
jrc0109
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My friend lives in the USA (NJ).
We tried a few things and we still cannot get the light to go on.
First - The high beam works (just the low beam does not go on).
Next- I measure voltage (11.8 volts) on both outside leads at the lamp plug.
I get the same reading on the passenger side (both low & high beam work on that side.
The center lead is grounded. I checked ground from the center lead to the metal on the firewall - close to zero resisitance.


I do not know where the headlamp fuse is. We can only see the fuse box under the hood, approximately above wheel on the driver side. We cannot find a fuse box in the cabin. Owners manuel does not help.

Any additional thought would be much appreciated. Thanks.
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Unread 09-04-2012, 02:41 AM   #7
Billwill
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Quote:
Originally Posted by jrc0109 View Post
My friend lives in the USA (NJ).
We tried a few things and we still cannot get the light to go on.
First - The high beam works (just the low beam does not go on).
Next- I measure voltage (11.8 volts) on both outside leads at the lamp plug.
I get the same reading on the passenger side (both low & high beam work on that side.
The center lead is grounded. I checked ground from the center lead to the metal on the firewall - close to zero resisitance.


I do not know where the headlamp fuse is. We can only see the fuse box under the hood, approximately above wheel on the driver side. We cannot find a fuse box in the cabin. Owners manuel does not help.

Any additional thought would be much appreciated. Thanks.

The headlamp fuses are in the main fuse panel which is inside the cabin.
On the right side of the dash ie. the passenger side in your LHD Jeep....there is a vertical panel that you will see if you have the door open. Unclip that panel and all the fuses are there.....the headlamp and dipped beam lamp fuses are somewhere near the bottom....your Owners' Manual should tell you which fuses are which but I would recommend you look at fuses 4, 5, 26 and 27....all 10 Amp fuses.
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Unread 09-08-2012, 11:02 AM   #8
jrc0109
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Can't find fuses in the cabin. I do not think it is a fuse problem anyway since I measure voltage at the headlight. For some reason, it is not getting any current. Maybe a high resistance wire or connection somewhere. Any other suggestions would still be appreciated. Thanks.
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Unread 09-09-2012, 01:53 AM   #9
Billwill
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Quote:
Originally Posted by jrc0109 View Post
Can't find fuses in the cabin. I do not think it is a fuse problem anyway since I measure voltage at the headlight. For some reason, it is not getting any current. Maybe a high resistance wire or connection somewhere. Any other suggestions would still be appreciated. Thanks.
When you measure the voltage at the headlight are you measuring with the red lead of your voltmeter on the lamp contact and the black lead of your meter going to the chassis ground or the negative pole of the battery?

If you do get voltage there then you may not be getting a proper ground going to the light bulb itself. You need to measure directly across the bulb...on the bulb contact and on the bulb ground and you would expect to get 12 volts there.
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Unread 09-09-2012, 02:04 AM   #10
HurricaneRZA
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I say bad grounds too, I'm not sure of the colours of the wires on your friend's vehicle, but it should be the black one. Follow it to see if it goes to a bolt, I've seen them bolted onto sheet metal. While this works it is not a very good ground, you could try removing the bolt, pull the ground wire loose and connect it to another wire grounded to the battery (for example, pull the headlamp ground wire and use a jumper cable from the negative post on your battery to the wire that should work as a ground for the light). If the bulb lights up you know you need to fix your ground.

If not then you may need to inspect the socket itself for any wear or damage that may prevent the bulb seating against the contacts correctly.
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Unread 01-19-2015, 03:28 PM   #11
rt2al
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did anyone figure out the issue? Jeeps have voltage control to go between high and low beam. If you check voltage on the headlight, in high beam, the high beam lead should have 12.5 volts and the low beam should drop to 11.04. In low beam, the low beam lead will be 12.5 volts and high beam lead will be 11.04. That is the switching process. If your are getting below 12 volts on both leads neither high or low beam will work.
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Unread 01-20-2015, 02:15 AM   #12
Billwill
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Quote:
Originally Posted by rt2al View Post
did anyone figure out the issue? Jeeps have voltage control to go between high and low beam. If you check voltage on the headlight, in high beam, the high beam lead should have 12.5 volts and the low beam should drop to 11.04. In low beam, the low beam lead will be 12.5 volts and high beam lead will be 11.04. That is the switching process. If your are getting below 12 volts on both leads neither high or low beam will work.
Sorry but I totally disagree with your statement above.
There is a High Beam Relay on the front of the internal fuse panel and a Low beam Relay on the rear side of the panel.....you either have more or less +12 volts on the High beam filament and nothing on the Low beam filament or vice-versa while there is a common ground for both filaments. If you had +12 volts on both filaments at the same time...due to modified wiring....both filaments would light up but you would soon melt your headlight assembly from the heat generated.

The Canadian models have a Daylight Running Relay fitted instead of the High Beam Relay and they do some funny things with it (resistors inside) so that you have dimmer beams on all the time while driving even if the lights are not switched on.
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