Sounds like the same issue I and several others had. It is your multifunction switch and needs replacing. Here is a linky to a repair video.....cost me $65 to fix it.
Before you do it though, check to see if it the fuse first.
Fog Lights not working
I have a 2012 Kia optima ex and recently my fog lights stopped working. High beams and low beams are working just fine. The fog lights would come on with the right turn signal on but would not come on any other time. I read that it could be the switch gone bad and replaced the turn signal stalk. Fog lights are still not working and now they don’t even come on with the right turn signal on. The fog light indicator on the dash does not come on either when they are turned on. Any suggestions on what the problem could be?
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The fog light fuse is in the cabin fuse box. There is an older post in the forums showing the location.
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