Interestingly, my 2018 RS connector has different wire arrangement than the one you're showing here. In any case, I think I figured out the wires to tap and broke the pin for my black wire while trying to snug it in. That's what I get for buying the ebay cheap-o cable (worth a shot for only $8). I think I might just hard wire to the fuse box instead. The R3 has buttons on top and doesn't fit so well under the rear view mirror - might do better in the upper corner by the A-pillar.