Never heard of this unit... surprised no one on here has talked about it. Wifi + 3G? Hmm. But by CAN bus I assume they mean I-bus wire as that is what the steering wheel controls are connected to. It is in the wiring harness, I forget which pin/color but search and you will find it.
Photo in Cleveland, Ohio
1999 323i - Totaled at 265,000 miles.
Now an e30 & e90 owner.