Hey everyone, just thought I'd chime in. I've successfully enabled traffic jam assist on my i3 (with some info from osunick). I have a couple videos and photos of it that I will post in a bit. I suggest reading the first post of this thread http://www.mybmwi3.com/forum/viewtopic. ... 963#p39963
if you are looking to retrofit. Basically, US based i3s do not have the necessary wiring harness to get the retrofit working out of the box. The Facebook post shows this too.
Rather than going about rewiring the car , I've created a module that can be installed in the footwell and will allow you to enable traffic jam assist (provided you have coded it on). No new steering wheel, touch module, clockspring, or wiring harness is needed ( according to the Facebook group: $1200 in parts and ALOT of work to install ).
Anyways, you can pick up a module at https://www.enhancedautomods.com