In my wife's car with DRLs enabled, it must use the light sensor because at night, if I turn off my headlights while the engine is running, the DRLs do not light up -- unlike the M2.
I also wait to pick up my kids and leave the engine running (for heat) and I want to extinguish all lights. Kind of a pain to turn DRLs on/off at night -- which will no doubt lead to leaving them off by accident.
[Which reminds me of the Residual Heating (REST) Function which I miss on the M2. I had it on my previous BMW and used it all the time in the winter. Shut the car off and if it's warmed up, push REST it ran the heater/blower].
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