Us top spec 🇺🇸 model comes with fog light at rear. Low spec model EC comes with 2 red reflector ...upper trim comes with rear fog on driver side and red reflector on passenger side.In the U.S. there is no rear fog lamps, and there are no regulations that I know of about when you can use forward facing fog lights. Of course, vehicle code is at the state level so it could be different in some states. As for my 2019 EC SEL, the fog lights work exactly as they did on my Outlander. To turn them on, the headlights must be on at the low beam setting. Then rotate the switch forward to turn them on, backwards to turn them off. If you switch to high beams, the fogs will turn off and come back on when you switch back to low beams. If you turn the headlights off, the fog lights go off too. If you turn the headlights back on, you must use the switch to turn the fog lights on. They do not come on automatically.
I could not find anything in the manual about automatic settings for fog lights. If your fog lights are coming on automatically with your headlights, something is connected improperly.
Ec with rear fog will come with same switch as outlander...however there are multiple ways of choosing how all light operate and I believe in Aries situation his model was set to operate as a day running light feature... its not any electrical wiring issue... its just settings... it can be set to use switch independent.
I believe I had selected this option where I opted for fog light to come on when I remote open asx/outlander sport ... but I change it back as I already had daylights and I prefer independent controll.... never done it on eclipse cross though.
Aries option is to ask a dealer tech to change preference ..hopefully he like you enough to do it for you otherwise find a programmer.
But its always good to have prior knowledge to tell dealer what you want to change ...than for them to spend long period of time searching for an option that might mess up your setting and then blame them to which they aren't getting paid to do.