Hello,
To make custom ambient lights using 3mm tube link:
https://www.aliexpress.com/item/32667312373.html?spm=a2g0s.8937460.0.0.44a12e0e5k3yJR
1. First of all is to remove the door panel.
2. After removing panel remove the screws (T20) marked with yellow arrows (picture 1).
3. After removed screws there will hold 2 clips (one is harder to reach) marked with red arrows (picture 1).
4. Drill a small hole for the tube using 4mm drill bit (picture 2).
5. After drilling hole put tube in the place (picture 3).
6. I my case I am using 2 5mm red LED with 300 Ohm resistance on both sides of tube (picture 4).
7. Put shrink tube on LED and heat if needed too mach LED size.
8. After that put LED on tube (picture 5).
If u want clean look from inside of door panel
9. Positive wire in door panel is with color GREY (PIN 2) (picture 6).
10. Negative wire in door panel is with color BLACK/WHITE (PIN 1) (picture 7).
And that's what it looks like at night (picture 8).