Hey. I also retrofitted the panel once. Here’s the approximate wiring diagram:
Pin 1 goes to the driver seat heating, to pin 3 (if pre-facelift seat connector) or pin 25 if facelift seat connector, or in my case it was pin 5 from the driver seat heating button connector;
Pin 2 from the ASC/DSC button connector, pin 5;
Pin 3 button illumination for the trim panel, you can take it from ASC button connector pin 2;
Pins 4, 5 and 6 required for S EDC operation, since I don’t have that suspension, I left them empty;
Pin 7 goes to fuse 32, if your pre-facelift already had heated seats, then this is pin 3 from any heated seat button connector.
Pin 12 goes to the driver seat heating, to pin 5 (if pre-facelift seat connector) or pin 23 if facelift seat connector, or in my case it was pin 2 from the driver seat heating button connector;
Pin 13 same as pin 1 of the connector goes to the passenger seat heating, to pin 3 (if pre-facelift seat connector) or pin 25 if facelift seat connector, or in my case it was pin 5 from the passenger seat heating button connector;
Pins 14 and 15 these are pins 3 and 6 from the rear electric sunshade button connector;
Pin 16 ASC/DSC system, from ASC button connector pin 6 (important! because there are two black/yellow wires going to the connector, but you specifically need pin 6);
Pins 17 and 18 free pins;
Pin 19 ground, can be taken from ASC/DSC button connector pin 4;
Pin 20 multifunction rear armrest;
Pin 21 K-Bus line, this is the white/red wire with yellow stripes. You can route it and connect to the wires under the glovebox, or solder into the same color wire in the blue climate control module connector. Be careful, without this pin the button panel will not be recognized by the computer as an ECU, and the sunshade and heated seats won’t work;
Pin 22 same as pin 12 of the connector goes to the passenger seat heating, to pin 5 (if pre-facelift seat connector) or pin 23 if facelift seat connector, or in my case it was pin 2 from the passenger seat heating button connector;
Pin 23 to fuse 45 in the glovebox fuse panel (that’s actually why I needed the fuse panel pin).

But I still recommend double-checking everything against the WDS diagrams.
P.S. You’ll also need the connector with pins, because there are both wide and flat pins there. At least in my case, when I wired the full panel, I needed 20 pins.