I believe that is the light that comes on when turning. It illuminates either the left or right side of the road depending on which direction you have your turn signal. I've also noticed that they're on when your in reverse. Other than those conditions the light isn't illuminated.
Mine are accessed from the top of the headlight housing. There are two small screws and a cover that comes off. If you unplug them you'll get an error.
I'd verify if they are illuminated while driving and not turning. Mine aren't illuminated.
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