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Old 03-04-2013, 06:08 PM   #1
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Factory Fog Light Diagnostics

Hey everyone, I recently purchased a 2001 Sahara and my factory fog lights don't work. The wiring diagram hasn't been all that helpful. It shows two fuses and two relays. So far I can only find one of the relays (under the hood, by the battery). When I pull the switch the indicator in the dash does not come on either.

David

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Old 03-04-2013, 06:43 PM   #2
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Theres also a relay mounted on the multi-function in the steering column. I had this same problem when I purchased my 2001 Sport. I changed the relay under the hood, check the fuse, and ended up changing the multi-function switch on the column. Works great now. If you decide to change it make sure you swap over that rellay mounted on the switch.

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Old 03-05-2013, 01:39 AM   #3
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You are looking at a diagram for 2000 or earlier. The fog light switch is on the end of the turn signal lever for a 2001. Starting in '01 there is only 1 relay (in the PDC) & one fuse, #19 also in the PDC. Those switches are known to go bad. To replace you need the left m-f switch as Ken said. Make sure the one you get has the fog light switch in it as there are both kinds & yes, be sure to transfer that relay, it is the turn signal & 4 way flasher relay.

Go here & pick 2002 TJ to see what you should have on your 2001.

See online read only FSMs here:
Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.
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Old 03-05-2013, 02:34 AM   #4
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i had a problem w/ my factory fog lights, i replaced the multi-function switch and that solved it. do a search on this forum there is a good write-up with pix on the process.

btw, do not buy the switch from your local jeep dealership, they charge twice what autozone does. i got burned that way.
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Old 03-05-2013, 10:38 PM   #5
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Thanks for the replies everyone! At $70, it's not my highest priority.
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Old 10-04-2013, 09:22 AM   #6
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Okay, since I started this thread, I bought a FSM, so I have my correct wiring diagram.

I have decided to add a simple rocker switch to the dash, and I would like to wire it to control my factory fog lights until I upgrade them at some point down the road. The FSM is somewhat helpful, but I would still like some help wiring through a rocker switch.

It appears that the White wire with the Orange stripe is the relay output, so I stripped a small portion of the insulation and sent 12v to the WT/OR wire, and nothing happened.

My next step was to check each wire under the relay in the PDC. None were +12v. What next?
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Old 10-04-2013, 10:13 AM   #7
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Originally Posted by dlm32067 View Post
Okay, since I started this thread, I bought a FSM, so I have my correct wiring diagram.

I have decided to add a simple rocker switch to the dash, and I would like to wire it to control my factory fog lights until I upgrade them at some point down the road. The FSM is somewhat helpful, but I would still like some help wiring through a rocker switch.

It appears that the White wire with the Orange stripe is the relay output, so I stripped a small portion of the insulation and sent 12v to the WT/OR wire, and nothing happened.

My next step was to check each wire under the relay in the PDC. None were +12v. What next?
It appears the red/orange energizes the relay. You are trying to send power to an open switch. If a 2002 diagram is the same as your 2001.
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Old 10-04-2013, 11:02 AM   #8
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It appears the red/orange energizes the relay. You are trying to send power to an open switch. If a 2002 diagram is the same as your 2001.
Just to clarify, the RD/OR should be powered? Always or switched at the ignition?
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Old 10-04-2013, 01:50 PM   #9
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The red/orange only has power when the high beams are on to open the relay & turn the fogs off.

Powering the white/orange should turn the fogs on if the relay is in place, good & the high beams are not on.

You are missing the purpose of the relay. The relay only switches OFF the fogs when the high beams are on. The fog light switch has no affect on the relay. The power to the switch is from the pink/light green wire (from fuse19) & the output (from the switch) is the white/orange wire. If you put the new switch between those 2 wires you should have the same function as with the OEM switch. If you want the fogs to work any time even when the high beams are on you can go from the fuse 19 wire to the light blue wire (relay output) that goes from the relay to the lights.
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Old 10-04-2013, 03:05 PM   #10
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Well, that explains a few things. Thanks for the information! I'm fairly good at installing new electrical accessories, but my experience is very limited with diagnosing or modifying existing factory circuits. Thanks again.
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Old 12-09-2013, 07:32 PM   #11
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The red/orange only has power when the high beams are on to open the relay & turn the fogs off.

Powering the white/orange should turn the fogs on if the relay is in place, good & the high beams are not on.

You are missing the purpose of the relay. The relay only switches OFF the fogs when the high beams are on. The fog light switch has no affect on the relay. The power to the switch is from the pink/light green wire (from fuse19) & the output (from the switch) is the white/orange wire. If you put the new switch between those 2 wires you should have the same function as with the OEM switch. If you want the fogs to work any time even when the high beams are on you can go from the fuse 19 wire to the light blue wire (relay output) that goes from the relay to the lights.
So since my TJ is a 99 and the wiring is slightly different. Does anyone know which wire I need to jump around so that my fog lights will stay on when I switch to the high beams? Thanks!
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Old 12-09-2013, 08:18 PM   #12
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So since my TJ is a 99 and the wiring is slightly different. Does anyone know which wire I need to jump around so that my fog lights will stay on when I switch to the high beams? Thanks!
Here's a drawing of the factory fog light circuit on a "99". Both relays are just to the right of the fuse block behind the glove box. Relay #2 is the one that shuts off the power to relay #1 when the high beams are turned on. There are a few ways to disable it. Easiest way is to clip the red/gray wire. Another way is to jump the black/yellow and the dark green/yellow wire.
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