Depending on your region, the tail light led bars are either programmed to be on or off with your DRL's.
But this can be simply fixed using a simple programmer like Carly BMW.
Mine was programmed "off" with DRL's from the factory, so I used my Carly BMW app to turn it back on with my DRL's in the app's settings -> "Daytime running lights – tail lights" • active or deactive
In my opinion, they look so much better with the led bars lit up even in the day time.
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