That explains it! When I tested it I had the lights on auto but was outside mid-day so the headlights weren't on. I pressed the rear fogs and nothing, pressed the front fogs and that forced the headlights on so the rear came on.
Then when I re-tested last night it was dark so the auto headlights were already on so the rear fogs came on when I pressed the button. Thanks, Razel!
Of course, one wouldn't need to put the rear fogs on without the headlights and front fogs on. But for testing, it is nice to know how it works.
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