Data bus system, block diagram - GF54.00-P-0004-03A
WARNING: This page is about a different car, the 2009 Mercedes-Benz CLK350 and 2008 Mercedes-Benz CLK350. However, it is still accessible from the selected car via links, so may be relevant.
All control units are interlinked through the CAN data bus.
A control unit receives a measured value from a sensor, prepares a data telegram from this and places it on the CAN data bus.
All other control units can then read and process this data packet.