@langers2k thank you for your reply, I saw you name pops up while I spend hours looking around this forum. I'm not trained to read the wiring diagram, and exactly this image is what you sent on year 2021:
could you advice, light L251 will have 3 outputs:
1. I have to connect the LIN to T27A pin 16, which I checked that this show be the door connector?
2. i have to connect the power to T27A pin 15, which it's connected to fuse 8? does this means if i connect to pin 15 i don't have to do anything else? cause it's internally wired?
3. I have to connect the ground to T27a pin 18? so this as well is internally connected? or.... i have the track the output of T27a does to where ultimately?
I going crazy.. please help. 😞