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Old 06-19-2014, 08:13 PM   #1
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Fog Lights won't turn off

'03 Rubicon

There is a problem in the column mounted switch. It was intermittent until recently, now they won't turn off at all. I can tap the end of the headlight/fog light switch and they will flicker off but always return to the on position.

I have pulled the fuse as a band-aid fix, but want to remedy the problem.

Has anyone else encountered this? I have no clue how to take apart and test. I assuming it is a simple contact on the inside, but I don't know if it is serviceable.

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Old 06-19-2014, 08:54 PM   #2
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They still only come on when low beams are illuminated?

Unfortunately that multifunction switch is a tj exclusive so no alternate source

If you are a cheep bastard just use an underhood relay to power them and control relay magnet with a plus from the low beam circuit and a ground from an in cab toggle control switch

If you just want them off for now just pull the fog light relay

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Old 06-19-2014, 09:14 PM   #3
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The fog light switch is spring-loaded to the ON position. There is a plastic pin that counters the spring to open the circuit. The pin melts and fails to break the connection. When I experienced that failure, I cut a piece off of a ball point pen ink tube and slid it over the pin to restore the original length.


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They still only come on when low beams are illuminated?
If the fog light switch closes, the fog lights illuminate. Until the battery dies.

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Unfortunately that multifunction switch is a tj exclusive so no alternate source
The switch is available as an aftermarket part at many chain parts stores.

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Originally Posted by Digger84 View Post

If you are a cheep bastard just use an underhood relay to power them and control relay magnet with a plus from the low beam circuit and a ground from an in cab toggle control switch
The circuit is there already. All that is needed is to replace the original switch with a substitute.

Repair info:

Write-up to Repair multifunction switch for fog lights. Fog lights won’t shut off.
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Old 06-19-2014, 09:34 PM   #4
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Not. Really the relay is not preventing full amps thru the switch on the late model not like the early tj with two relays where bulb current does not pass thru the switch

Aftermarket multifunction switches are cheep crap and oem are pricey

For early TJ used neon are a boon but again the cheep aftermarket ones are crap as I found out a lifetime warranty on a POS is just exchangeable for another POS
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Old 06-19-2014, 09:52 PM   #5
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Not. Really the relay is not preventing full amps thru the switch on the late model not like the early tj with two relays where bulb current does not pass thru the switch
If the original switch is the problem and the problem switch is replaced by a switch that can handle the load, doesn't that eliminate the problem?
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Old 06-19-2014, 10:01 PM   #6
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Just a poor design where aa a switch controlling a relay bringing a direct battery circuit to the lights is a improvement that also allows upgraded lights if desired

Have yet to see no relay controlled light circuits where the switch consistently lasts not to mention the safety margin of just bringing the relay ground control thru the firewall

I did play with the 04 fog stalk mounted pull switch and if working properly if goes in (to off position) as park headlight knob is rotated to off but independently via under hood relay the fogs also won't come on if headlight stalk is in bright position so that should be an alternate way to turn them off as long as no one has done the relay mod
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Old 06-19-2014, 10:07 PM   #7
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I did play with the 04 fog stalk mounted pull switch and if working properly if goes in (to off position) as park headlight knob is rotated to off...
When the pin melts, that feature no longer functions as intended.
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Old 02-26-2015, 10:31 AM   #8
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The fog light switch (MFS) for a 2005 Rubicon is different than one for a TJ. MOPAR Parts said they didn't have a replacement and referred me to a dealer. There is a UTUBE showing a fix.
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Old 02-26-2015, 09:33 PM   #9
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The fog light switch (MFS) for a 2005 Rubicon is different than one for a TJ.
There only difference is a function of whether the vehicle was factory-equipped with fog lights or not. Obviously, if you have fog lights, you need the corresponding MFS.
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Old 02-26-2015, 10:13 PM   #10
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maybe this is like the ignition switch malfunction which Jeep no longer sells but is available thru several after market suppliers

i think all TJRs came with fog lites from the factory in 05
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Old 02-26-2015, 11:27 PM   #11
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I know! I've had some issues with this. Ended up replacing the stick with all the light switches on it. Thought it was that all along, ended up replacing relays, 2 dead batteries and getting stranded later, it was the switch stick.
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Old 02-27-2015, 12:23 PM   #12
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i think all TJRs came with fog lites from the factory in 05
And they came the exact same MFS as any other 01-06 model with fog lights.

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