Overall network (GVN) function - GF00.19-P-0001CE

MODEL 204.0 /2 as of model year 2009/YoM 08

MODEL 204.3

MODEL 204.9

Model 204.0/2 up to 28.2.11, model 204.9

Fig 1: Overall Network (GVN) Function Diagram - Up To 28.2.11 (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Overall Network (GVN) Function Diagram - Up To 28.2.11 (2 Of 2)

Courtesy of MERCEDES-BENZ USA

Model 204.0/2 as of 1.3.11, model 204.3

Fig 3: Overall Network (GVN) Function Diagram - As Of 1.3.11 (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 4: Overall Network (GVN) Function Diagram - As Of 1.3.11 (2 Of 2)

Courtesy of MERCEDES-BENZ USA

General overall network

The increased demands that are made of the vehicle electronics in areas

such as the following:

Vehicle safety
Comfort
Communication
Diagnosis

require networking of the existing systems in the vehicle so that the necessary information can be exchanged.

This cannot be achieved using conventional data transfer since the amount of installation space is limited and a reduction of the weight of the vehicle is targeted. This is why data bus systems are used.

The vehicle electronics are networked using the following data bus systems:

Controller Area Network (CAN)
MOST

CAN

The CAN is an electrical bus system for the transmission of data via two lines.

The CAN consists of a twisted two-core data line that connects all CAN participants (control units) via a parallel connection.

The two lines of the data line must not be swapped (low level/high level).

Each connected control unit is able to transmit or receive data (bidirectional bus). The data is transmitted digitally on the CAN at various intervals. The individual data blocks are defined in a data protocol and it is specified which data are received or transmitted by a control unit.

The sum of the data blocks, the short break between two transmission intervals and other properties of the CAN are checked constantly. Detected faults are stored and placed in the fault memory.

The CAN offers the following advantages:

Data exchange between individual control units
Provision of sensor signals for several systems
Reduction of the number of electrical lines
Improvement of the electromagnetic compatibility

The following CAN systems are involved in the overall network:

Telematics CAN
Interior CAN
Drive train CAN
Diagnostic CAN
Chassis CAN
Front end CAN
Vehicle dynamics CAN
Sensor CAN

Telematics CAN

The telematics CAN is used for the data exchange of the attached audio components with one another.

The telematics CAN operates at a transfer rate of 125 kBit/s.

The following control units are subscribers to the telematics CAN:

Radio (with code (523) MB Audio 20 radio or code (510) Audio 20 with CD changer)
Navigation module as of 1.3.11 with code (509) Navigation box)
Cradle for navigation module as of 1.3.11 (with code (508) Navigation box preinstallation or code (509) Navigation box)
Radio with auto pilot system (with code (525) MB Audio 50 APS radio or code (511) Audio 50 APS with DVD changer)
COMAND controller unit (with code (527) COMAND APS with single DVD drive (with navigation) or code (512) COMAND APS with DVD changer or as of 1.6.09 with code (528) COMAND with DVD changer)
DVD player (with model 204.9 with code (864) Rear entertainment system or code (866) Rear entertainment preinstallation)
Left rear display (with model 204.9 with code (864) Rear entertainment system)
Right rear display (with model 204.9 with code (864) Rear entertainment system)
Audio/COMAND display (with code (523) Radio MB Audio 20 or code (510) Audio 20 incl. CD changer or code (525) Radio MB Audio 50 APS or code (511) Audio 50 APS incl. DVD changer or code (527) COMAND APS with single DVD drive (with navigation) or code (512) COMAND APS incl. DVD changer or as of 1.6.09 with code (528) COMAND incl. DVD changer)
Audio/COMAND control panel (with code (523) MB Audio 20 radio or code (510) Audio 20 with CD changer or code (525) MB Audio 50 APS radio or code (511) Audio 50 APS with DVD changer or code (527) COMAND APS with single DVD drive (with navigation) or code (512) COMAND APS with DVD changer or as of 1.6.09 with code (528) COMAND with DVD changer)

Gateway:

The following control unit forms the interface for the data exchange between the telematics CAN and other bus systems:

Radio or COMAND controller unit

Interior CAN

The interior CAN is used for the data exchange of the attached control units with one another. The interior CAN operates at a transfer rate of 125 kBit/s.

The following control units are subscribers to the interior CAN:

Instrument cluster
Stationary heater control unit (with code (228) Stationary heater)
Radio or COMAND controller unit
Panoramic sliding roof control module (with code (413) Panoramic glass sunroof with top sliding sunroof)
Front SAM control unit
Rear SAM control unit
Automatic air conditioning control and operating unit
Special-purpose vehicle multifunction control unit (with model 204.0/2 with code (965) Electric preinstallation for rental vehicle)
Trailer recognition control unit (with code (550) Trailer hitch)
Driver seat control unit (with code (275) Memory package (driver seat, steering column, mirrors))
Front passenger seat control unit (with code (242) Electrically adjustable front passenger seat with memory)
Parking system control unit (with code (220) PARKTRONIC)
Reversing camera control unit (model 204.0/2 up to 28.2.11 with code (218) Reversing camera and code (498) Japan version, model 204.9 with code (218)
Reversing camera and code (498) Japan version) - Left front door control unit
Right front door control unit
Left rear door control unit (with model 204.0/2/9)
Right rear door control unit (with model 204.0/2/9)
Keyless-Go control unit (with code (889) Keyless-Go)
Overhead control panel control unit (model 204.0/2 with code (414) Electric glass tilting/sliding roof)
Electronic ignition switch control unit
Tire pressure monitor control unit (with code (470) Tire pressure monitor (standard))
Weight Sensing System (WSS) control unit (with model 204.0 up to 28.2.11, model 204.9 up to 31.5.11, model 204.3 with code (U10) Front passenger seat with weight detection)
Liftgate control unit (model 204.2/9 with code (890) EASY-PACK liftgate)

Gateway:

The following control units form the interface for the data exchange between the interior CAN and other bus systems:

Front SAM control unit
Radio or COMAND controller unit

The electronic ignition lock control unit and the instrument cluster are also connected to the chassis CAN but do not have a gateway function.

Drive train CAN

The drive train CAN is used for the data exchange of the attached control units with one another. The drive train CAN operates at a transfer rate of 500 kBit/s.

The following control units use the drive train CAN:

CDI control unit (with diesel engine)
ME-SFI [ME] control unit (with gasoline engine)
Electronic transmission-control control unit (on transmission 722.6)
Electronic selector lever module control unit (with transmission 722)
Left nitrogen oxides control unit (with engine 272.98)
Left NOx sensor control unit (with engine 276.9)
Right nitrogen oxides control unit (with engine 272.98)
Right NOx sensor control unit (with engine 276.9)
Fuel system control unit (with engine 271, 272, 276, 642.8, 651.9)
Left fuel system control unit (with engine 156)
Right fuel system control unit (with engine 156)
Gear oil auxiliary pump control unit (with transmission 722.9 and code (B03) ECO start/stop function)
Fully integrated transmission-control control unit (with transmission 722.9)

Gateway:

The CDI control unit or ME-SFI control unit forms the interface for data exchange between the drive CAN and other bus systems.

Diagnostic CAN

The diagnostic CAN is used for exchanging data between the external diagnostic tester and the control units in the vehicle through the diagnostic connector (X11/4).

The diagnostic CAN operates at a transfer rate of 500 kBit/s.

The following control units are subscribers to the diagnostic CAN:

Front SAM control unit
Emergency call system control unit (with model 204.0/3/9 with code (359) TELE AID emergency call system)

Gateway:

The front SAM control unit forms the interface for the data exchange between the diagnostic CAN and other bus systems.

Chassis CAN

The chassis CAN is used for the data exchange of the connected control units from various systems with each other. The chassis CAN operates at a transfer rate of 500 kBit/s.

The following control units are chassis CAN subscribers:

Instrument cluster
Multifunction camera (as of 1.3.11 with code (238) Active Lane Keeping Assist, code (476) Automatic Lane Recognition, code (513) Speed Limit Assist or code (608) Adaptive Highbeam Assist)
Left front reversible emergency tensioning retractor (with code (299) PRE-SAFE)
Right front reversible emergency tensioning retractor (with code (299) PRE-SAFE)
Electrohydraulic power steering (in model 204.902/982/984)
Supplemental restraint system control unit
CDI control unit or ME-SFI [ME] control unit
Front SAM control unit
Electronic Stability Program control unit
Adaptive damping system control unit (in model 204.0/2 with code (483) ADVANCED AGILITY package)
Parking system control unit (as of 1.3.11 with code (230) Exclusive parking assist)
Electronic ignition switch control unit
Steering column module control unit
Tire pressure monitor control unit (with code (475) Tire pressure monitor (Premium))

Gateway:

The following control units form the interface for the data exchange between the chassis CAN and the other bus systems:

Front SAM control unit
CDI control unit or ME-SFI [ME] control unit
Electronic Stability Program control unit

Front end CAN

The front end CAN is used for the data exchange of the attached control units with one another. The front end CAN operates at a transfer rate of 500 kBit/s.

The following control units are front end CAN subscribers:

Left rear bumper intelligent radar sensor (as of 1.3.11 with code (234) Blind Spot Assist)
Right rear bumper intelligent radar sensor (as of 1.3.11 with code (234) Blind Spot Assist)
Front SAM control unit
Headlamp control unit (as of 1.3.11 with model 204.0/2/3 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic))
Left xenon light control unit (up to 28.2.11 with model 204.0/2 with code (614) Bi-xenon headlamp unit or code (618) Bi-xenon headlamp or code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic), with model 204.9 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic))
Right xenon light control unit (up to 28.2.11 with model 204.0/2 with code (614) Bi-xenon headlamp unit or code (618) Bi-xenon headlamp or code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic), with model 204.9 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic))

Gateway:

The front SAM control unit forms the interface for the data exchange between the front end CAN and other bus systems:

Vehicle dynamics CAN

The vehicle dynamics CAN is used for the data exchange of the attached control units with one another. The vehicle dynamics CAN operates at a transfer rate of 500 kBit/s.

The following control units are subscribers to the vehicle dynamics CAN:

DISTRONIC electric controller unit (as of 1.3.11 with code (233) DISTRONIC PLUS or code (237) Active Blind Spot Assist or code (238) Active Lane Keeping Assist)
Yaw rate sensor for lateral and longitudinal acceleration (up to 28.2.11, as of 1.3.11 (with code (233) DISTRONIC PLUS, code (237) Active Blind Spot Assist or code (238) Active Lane Keeping Assist and model 204.077/277/375)
Electronic Stability Program control unit
Video and radar sensor system control unit (as of 1.3.11 with code (233) DISTRONIC PLUS, code (237) Active Blind Spot Assist or code (238) Active Lane Keeping Assist)

Gateway:

The following control units form the interface for the data exchange between the vehicle dynamics CAN and the other bus systems:

Electronic Stability Program control unit
Video and radar sensor system control unit

Sensor CAN

The sensor CAN is used for the data exchange of the attached control units with one another. The sensor CAN operates with a transfer rate of 500 kBit/s.

The following radar sensors use the sensor CAN:

Left front bumper DISTRONIC (DTR) sensor (with code (233) DISTRONIC PLUS)
Right front bumper DISTRONIC (DTR) sensor (with code (233) DISTRONIC PLUS)
Left rear bumper radar sensor (with code (237) Active Blind Spot Assist)
Right rear bumper radar sensor (with code (237) Active Blind Spot Assist)

Gateway: The video and radar sensor system control unit forms the interface for data exchange between the sensor CAN and other bus systems:

MOST

MOST is an optical data bus system.

Here, data are transferred via fiber optic cable to the connected information, navigation, and communication components. The MOST operates with a transfer rate of 22 Mbits/s.

The following control units are subscribers to the MOST:

Radio or COMAND controller unit
Digital TV tuner (as of 1.6.09 with code 498) Japan version)
Sound system amplifier control unit (with code (810) Sound system)
Media interface control unit (with code (518) Media interface)
Digital Audio Broadcasting control unit (with code (537) Digital radio)
SDAR control unit / high definition tuner (model 204.0/9 as of 1.6.09 up to 31.5.10 with code (512) COMAND APS incl. DVD changer or with code (528) COMAND incl. DVD changer and with code (536) SIRIUS satellite radio)
Satellite digital audio radio (SDAR) control unit with model 204.0 with code (536) SIRIUS satellite radio and code (523) MB Audio 20 radio or code (510) Audio 20 incl. CD changer, with model 204.0 up to 31.5.09 with code (536) SIRIUS satellite radio and code (512) COMAND APS incl. DVD changer, with model 204.9 with code (536) SIRIUS satellite radio and code (523) MB Audio 20 radio or code (510) Audio 20 incl. CD changer, with model 204.9 up to 31.5.09 with code (536) SIRIUS satellite radio and with code (512) COMAND APS incl. DVD changer, with model 204.0/9 as of 1.6.10 with code (536) SIRIUS satellite radio, with model 204.3 with code (536) SIRIUS satellite radio)

Gateway:

The radio or COMAND controller unit forms the interface for the data exchange between the MOST and other bus systems.

Overview of system components for overall network (GVN)

GF00.19-P-9997CE