Some background, I looked at the parts listing for 5AR (Traffic Jam Assist) on etkbmw:
https://www.etkbmw.com/bmw/EN/search/op ... 8170/S5ARA
Basically, three are listed- a wheel with capacitive touch sensors, a new switch cluster with the Traffic Jam button, and a new clockspring/stalk assembly with wiring for the touch sensor. (note that 5AT is a required option for 5AR, which is the adaptive cruise and pedestrian detection option)
I ordered the parts and waited months for them to arrive. After getting them, i installed them, which was largely fine except for airbag removal, which is by far the most annoying part of the process. After installing all the parts, I VO Coded the car to add 5AR and then coded the right modules. (BKOMBI, BDC, KAFAS2). Then I ran rheingold to calibrate the touch sensor. One error- Missing LIN Slave on the Touch Sensor. Basically the touch sensor wasn't getting power. I looked at the schematic and looks like touch is powered by fuse 58 in the box, which had no fuse in my US car. I put in a fuse, no joy. I finally took everything apart and turns out there is an 8 pin connector on the back of the clockspring with 4 live pins on the clockspring without touch, and 6 live pins on the touch enabled clockspring. The harness on the car side is an 8 pin connector but BMW did not include the extra two wires for touch in the harness for non TJA cars. At this point, I'm not going to mess with the vehicle side harness, but thought this information might be helpful. Car is back to stock now, no issues.
If anyone has ideas, wants to buy my parts from me, or wants to borrow them to see if they can figure out the wiring, PM me. Hope this helps.