Below is a topological diagram illustrating the Infotainment data bus on the Phaeton. As with the other two busses, drivetrain and convenience, the module that operates the screen between the speedometer and the tachometer serves as the gateway that allows the three busses to communicate with each other.
There is a fourth bus on the vehicle, that being the fiber optic cable that runs between the navigation CD player and the big display screen between the two front seats. To quote VW, "An extended rear operating unit is conceivable as part of a future development of the infotainment system". In other words, a large control module could be installed in the rear seating area, with the same capability as the front screen control module. Controller number J524 has been assigned to this future development, and it will use address 27. In the meantime, the basic "Rear Climatronic Control and Display Unit" that we all have on our North American Phaetons uses address 28, and it is module E265.
The voice control module at address 67 is not illustrated in this diagram. Some Phaetons have a voice recognition feature that can be used to trigger certain functions, for example, to provide the PIN number for a mobile phone. Cars with this module will have additional buttons on the left hand side of the steering wheel, between the existing 'volume up' and 'volume down' buttons.
As with the diagrams above, text in red, including the addresses for each module, has been added by me.
Infotainment CAN bus Topology