Communication between Telematic Communication Box and headunit
WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
For the transfer of telematics information the Telematic Communication Box (TCB) is connected to the headunit via a USB cable. The transfer is effected on the USB standard 2.0.