If I'm not mistaken the CS/ CSL has dual LEDs. And changing to the yellow DRLs, and recoding isn't going to give you the white without the white LED being there. When cars were much easier, back in the 1990s, all you would have to do was add the second bulb color, and use a relay to switch colors.
When the parking lights were on the stalk, you could use the parking lights for yellow, and switching to headlights, the relay would switch, the yellow LED off, and switch the white LED on, with the headlights, today, it's far more complicated.
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