I'll just cover the bits that are missing from that DIY.
There are basically atleast two configuration for the doors.
1. Models with Door Modules.
2. Models without Door Modules.
Both the DIY linked and my car are the later versions without the door modules.
Don't bother putting any resistors in series with the LEDs because the signal is already current limited and adding resistors will just make the LEDs are lot dimmer.
Definately spend money and buy the OEM LEDs because they come in a housing that clicks into the openings and at the correct angle. The OEM LEDs also come with a 2 pin socket housing at the end.
Besides all the parts listed in that other DIY to make EACH door plug and play you need the following parts.
1. 1 x Universal socket housing uncoded 4 POL. 61138380696
2. 1 x Universal pin terminal uncoded 4 POL. 61136925611
3. 8 x Pin-contact 0,2- 0,5MM² 61130005198 - these come with about 1 foot of wire attached (or if you want to crimp things yourself you need 8 x 61131383672)
4. 4 x Bushing contact 0,2- 0,5MM² 61130005197 - these come with about 1 foot of wire attached (or if you want to crimp things yourself you need 4 x 61131383776)
5. 2 x Universal pin terminal uncoded 2 POL. 61138373583
Now you need to make up a junction to split the power from each switch so that you get two new outputs to go to the two new LEDs.
What you are aiming for is a direct connection from the pin terminal uncoded 4 POL. 61136925611 to the socket housing uncoded 4 POL. 61138380696 for the pins you don't need. And a branch out for the two pins you need. These are Ground on pin 2 and +ve is on pin 3 in three doors, but in pin 4 in Driver door. I chose to make these connections on a small vero board and then covered it in heat shrink.
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Take the two output wires for the LEDs and connect them up to four Pin-contact 0,2- 0,5MM² 61130005198. The LED at the bottom door may need some extension wire so that it reaches there.
Put on the two pin terminal uncoded 2 POL. 61138373583 to the pin contacts and then you can plug the LEDs into them.
Making the holes in the doors are a pain, be very very careful when making the holes especially the one near the door handle because your drill bit can go through the handle if you are not careful. Start small and work your way slowly.
It may help to cut off the small catch on the LED exits to make it easier to mount but then you will need some glue to hold those in place.
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May sure you tape the new wiring carefully to the door and avoid the air bag routes.
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That's it. Doing it this way you can always still remove the door panels and change any of the LEDs if they blow.
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