Block diagram of multiplex networks of Vito Viano cars (Mercedes-Benz Vito W639)

To exchange information between the elements of the vehicle's control system, three data transmission systems are used:

class B data bus operating in the vehicle's passenger compartment (CAN B);
class C data bus operating in the engine compartment of a vehicle (CAN C);
digital data bus (D2B).

Below is a block diagram of the multiplex networks for the 639.601 models; 639.603; 639.605; 639.701; 639.703; 639.705; 639.711; 639.713; 639.811; 639.813; 639.815 manufactured before 31.03.2006 with engine 646.982 or 646.983, with automatic transmission 722.6, equipped according to the equipment codes (see table).

Code	Decoding the equipment code
EP5	Multi-disc CD player
EN₂	Autopilot system with TMS interface
EM9	DVD player with TV receiver and screen in the rear
H12	Additional heater (warm water)
EL1	Voice control of the phone (unguatronic system, German language)
ENZ	Radio preparation for the CTEL mobile communication system
ED5	Specialized parameterization block (PSM)
E57	Trailer Electrical Connector System
SF1	Seat with electrical adjustment and memory (driver)
SF2	Seat with electrical adjustment and memory (passenger)
СLO	Rear air suspension with body level control
EZ8	Parktronic system (PTS)
LD0	Upper control panel with individual lighting for driver and front passenger
D24	Transparent tilting and sliding roof of the passenger compartment