^^ If you have 6NR and 6NF already added to you FA, you nede to run an FBAS cable (two wire + shield) to one of the 3 inputs on the CIC. Then there is another cable that gets run to the combox for USB, in addition to the existing one thats used for 6FL.
There is a long thread on bmwcoding about it, but its worth the read if you are going to do it yourself. Have a look at posts
28 and post
30 for pin outs etc
