Overall Network (GVN) Function - GF00.19-P-0001RFM
Model 205
as of model year 2019
Model 253 (except 253.99)
as of model year 2020
Model 253.99
Model 253.99
Overall network, general
The demands on the vehicle electronics, e.g. in the following areas, are constantly increasing:
- Vehicle safety
- Comfort
- Communication
- Diagnosis
This requires 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 bus systems are used.
The vehicle electronics are networked using the following bus systems:
- CAN
- Chassis FlexRay
- MOST
- Ethernet
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 sent digitally via 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 CANs are involved in the overall network:
- Telematics CAN
- AMG CAN (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
- Interior CAN
- Engine CAN (except model 253.99)
- Drive train CAN
- Diagnostic CAN
- Vehicle dynamics CAN
- User interface CAN
- Drive train sensor CAN (except model 253.99)
- Hybrid CAN (hybrid vehicles or vehicles with code B01 (48V technology) or model 253.99)
- Peripherals CAN
- Radar-CAN 2 (with CODE 23P (Driving Assistance package))
- Steering wheel CAN
- Fuel cells CAN (model 253.99)
- Hydrogen supply CAN (model 253.99)
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 data rate of 250 kBit/s.
The following control units are participants on the telematics CAN:
- Head unit
- Audio/COMAND display
- Audio/COMAND control panel (model 205 except code 446 (Touchpad only))
- Touchpad (with code 446 (Touchpad only) or code 448 (Touchpad))
- Engine sound control unit (with code B63 (Sporty engine sound))
- Mobile phone cradle control unit (with code 896 (Vehicle access and drive authorization via mobile phone) or code 897 (Wireless mobile phone charging) or code 899 (Multifunction telephony))
- Hand motion sensor (with CODE 77B (contactless gesture control at front))
Gateway:
The head unit forms the interface for data exchange between control units connected to other bus systems.
The following control units are connected via the LCP LIN to the Audio/COMAND control panel (model 205 except code 446 (Touchpad only)) or to the touchpad (with code 446 (Touchpad only):
- Upper control panel control unit
- Left lower control panel
- Right lower control panel
AMG CAN (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
The AMG CAN is used for the data exchange of the attached control units with one another. The AMG CAN operates at a data rate of 500 kBit/s.
The following control units are participants of the AMG CAN:
- Electronic differential control unit (with CODE 467 (Electronic differential lock))
- Active engine mount control unit (with CODE 466 (Active engine mount))
- Drive program control unit (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
Gateway:
The transmission mode control unit forms the interface for data exchange with control units that are connected to other bus systems.
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 data rate of 250 kBit/s.
The following control units are participants on the interior CAN:
- Panoramic sliding sunroof control unit (with code 413 (Panoramic sliding sunroof))
- Sliding roof control module (with CODE 414 (Sliding roof))
- Front SAM control unit
- Rear SAM control unit
- Climate control control unit
- Rear control unit (model 205.3 with code U02 (Electric belt extender), model 205.4)
- Special-purpose vehicle multifunction control unit (with CODE 965 (Taxi/rental vehicle pre-installation))
- Trailer recognition control unit (with code 550 (Trailer hitch))
- Driver seat control unit (with code (275) Memory package)
- Front passenger seat control unit (with code 242 (Electrically adjustable front passenger seat with memory))
- Left front door control unit
- Right front door control unit
- Left rear door control unit (model 205.0/1/2.253)
- Right rear door control unit (model 205.0/1/2, 253)
- KEYLESS-GO control unit
- Electronic ignition switch control unit
- Trunk lid control (KDS) control unit (with CODE 881 (Remote trunk closing))
- Liftgate control unit (with CODE 890 (EASY-PACK liftgate))
- DC/DC converter control unit (with code B01 (48V technology))
- Ambiance illumination control unit (with code 877 (Ambiance illumination))
- Overhead control panel control unit
- Left front multicontour seat control unit (with code 409 (Left/right front multicontour seats))
- Right front multicontour seat control unit (with code 409 (Left/right front multicontour seats))
Gateway:
The electronic ignition lock control unit forms the interface for data exchange between control units connected to other bus systems.
The rain/light sensor with additional functions is connected via the rain/light sensor LIN to the front SAM control unit.
The following control units are connected to the A/C system control unit via LIN:
- Stationary heater control unit (with CODE 228 (Stationary heater)) via the climate control LIN 2
- Electric refrigerant compressor (hybrid vehicles, model 253.99) via air conditioning control LIN 2
- Rear air conditioning operating unit (with code 581 (Automatic air conditioning)) via climate control LIN
- Climate control operating unit via climate control LIN
The following control units are connected to the rear SAM control unit via heater LIN:
- Front seat heating control unit (with code 401 (Seat climate control for driver and front passenger) or code 873 (Seat heating for driver and front passenger) and except code 242 (Electrically adjustable front passenger seat with memory function) and except code 222 (Electrically adjustable right front seat))
- Rear seat heater control unit (with code 872 (Seat heater in rear))
- Driver's seat control unit (with CODE 221 (Electrically adjustable left driver's seat))
- Front passenger seat control unit (with CODE 222 (Electrically adjustable right front seat))
- AIRSCARF control unit (with code 403 (AIRSCARF system))
Engine CAN (except model 253.99)
The engine CAN is used for the data exchange of the connected control units with one another. The engine CAN operates at a data rate of 500 kBit/s.
The following control units are participants of the engine CAN:
- CDI control unit or ME-SFI [ME] control unit
- Drivetrain control unit
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- CDI control unit or ME-SFI [ME] control unit
- Drivetrain control unit
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 data rate of 500 kBit/s.
The following control units are participants on the drive train CAN:
- CDI control unit or ME-SFI control unit (except model 253.99)
- Drive program control unit (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
- Fuel system control unit (except model 253.99)
- Drivetrain control unit
- Fully integrated transmission control unit (transmission 724, 725)
- Engine sound control unit (with code B63 (Sporty engine sound))
- Midline sound system amplifier control unit (model 205 with code 853 ("Midline" sound system) and with code B63 (Sporty engine sound))
- Sound system amplifier control unit (with code 810 (Sound system) and with code B63 (Sporty engine sound))
- Accelerator pedal sensor (model 253.99)
- Power electronics control unit (model 253.99)
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- CDI control unit or ME-SFI control unit (except model 253.99)
- Drive program control unit (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
- Drivetrain control unit
Diagnostic CAN
The diagnostic CAN is used for the data exchange of the external diagnostic tester with the control units in the vehicle. The diagnostic CAN operates at a data rate of 500 kBit/s.
The following control units are participants on the diagnostic CAN:
- Electronic ignition switch control unit
- HERMES control unit (with code 362 (HERMES LTE))
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- Electronic ignition switch control unit
- HERMES control unit (with code 362 (HERMES LTE))
The Supplemental Restraint System control unit and the HERMES control unit (with code 362 (HERMES LTE)) are connected to each other over the seat occupied LIN.
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 data rate of 500 kBit/s.
The following control units are participants on the vehicle dynamics CAN:
- Supplemental restraint system control unit
- Electronic Stability Program control unit
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- Supplemental restraint system control unit
- Electronic Stability Program control unit
The following control units are connected to the Supplemental Restraint System control unit via the seat occupied LIN:
- Weight sensing system (WSS) control unit (with code U10 (Automatic front passenger airbag shutoff))
- HERMES control unit (with code 362 (HERMES LTE))
User interface CAN
The user interface CAN is used for the data exchange of the attached control units with one another. The user interface CAN operates at a data rate of 500 kBit/s.
The following control units are participants of the user interface CAN:
- Instrument cluster
- Head unit
- Head-up-display (with code 463 (Head-up display))
- Left front reversible emergency tensioning retractor (with CODE 299 (PRE-SAFE® system))
- Right front reversible emergency tensioning retractor (with CODE 299 (PRE-SAFE® system))
- Reversing camera control unit (with code 218 (Reversing camera) except code 235 (Parking Pilot with PARKTRONIC))
- Supplemental restraint system control unit
- Drive program control unit (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
- Electronic ignition switch control unit
- Tire pressure monitor control unit (with CODE 475 (Tire pressure monitor))
- Augmented reality camera (with code 21U (video recording function (dashcam)) or code U19 (augmented reality))
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- Head unit
- Drive program control unit (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
- Electronic ignition switch control unit
Drive train sensor CAN (except model 253.99)
The drive train sensor CAN is used for the data exchange of the attached control units with one another. The drive train sensor CAN operates at a data rate of 500 kBit/s.
The following control units are participants on the drive train sensor CAN:
- CDI control unit or ME-SFI [ME] control unit
- Catalytic converter heater control unit (model 205 except 205.012/212, with engine 651.9 and code 494 (USA version))
- NOx sensor control unit (engine 274.9 with CODE 920 (Gasoline direct injection with stratified charge))
- NOx sensor control unit downstream of diesel particulate filter (engine 626.9 or engine 651.9)
- NOx sensor control unit downstream of SCR catalytic converter (engine 626.9 or engine 651.9 or engine 654.9 or engine 656.9)
- NOx sensor control unit upstream of diesel oxidation catalytic converter (engine 654.9, 656.9, with code U79 (BLUETEC (SCR) diesel exhaust gas aftertreatment, 3rd generation))
- AdBlue® control unit (diesel engine)
Gateway:
The CDI control unit or the ME-SFI [ME] control unit forms the interface for data exchange between control unit connected to other bus systems.
Hybrid CAN (hybrid vehicles or vehicles with code B01 (48V technology) or model 253.99)
The hybrid CAN is used for the data exchange of the connected control units with one another. The hybrid CAN operates at a data rate of 500 kBit/s.
The following control units are subscribers to the hybrid CAN:
- Battery management system control unit (model 205.012/013/047/053/147/212/213/247/253, model 253.311/353/911/953/99)
- Charger (model 205.013/047/053/147/213/247/253)
- Alternating current charger for high-voltage battery (model 253.311/353/911/953/99)
- HERMES control unit (with code 362 (HERMES LTE))
- Drivetrain control unit
- Power electronics control unit (model 205.012/013/047/053/147/212/213/247/253, model 253.311/353/911/953)
- Starter alternator (engine 264 with code B01 (48V technology))
- Sound generator (model 205.013/047/053/147/213/247/253, model 253.311/353/911/953/99, with code B53 (acoustic presence indicator))
- Sound generator 2 (model 253.311/353/911/953, with code B53 (acoustic presence indicator))
- DC/DC converter control unit (model 253.99)
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- Drivetrain control unit
- HERMES control unit (with code 362 (HERMES LTE))
Peripherals CAN
The periphery CAN is used for the data exchange of the attached control units with one another. The periphery CAN operates at a data rate of 500 kBit/s.
The following control units are participants of the periphery CAN:
- Mono multifunction camera (model 205 with code 513 (Traffic Sign Assist), code 640 (High Performance LED) or code 641 (Dynamic LED headlamps for left-hand traffic) or code 642 (Dynamic LED headlamps for right-hand traffic) or code 22P (Lane Tracking Package))
- Active Brake Assist controller unit (with code 258 (Active Brake Assist))
- Integrated outer right rear bumper radar sensor (with CODE 234 (Blind Spot Assist))
- Integrated outer left rear bumper radar sensor (with CODE 234 (Blind Spot Assist))
- Left headlamp control unit (with CODE 631 (Static left-hand traffic LED headlamp) or CODE 632 (Static right-hand traffic LED headlamp) or CODE 640 (High-performance LED) or CODE 641 (DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP) or CODE 642 (DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP))
- Right headlamp control unit (with CODE 631 (Static left-hand traffic LED headlamp) or CODE 632 (Static right-hand traffic LED headlamp) or CODE 640 (High-performance LED) or CODE 641 (DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP) or CODE 642 (DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP))
- Left front LED matrix lamp unit control unit (with code 640 (High Performance LED) or code 641 (Left-hand drive dynamic LED headlamp) or code 642 (Right-hand drive dynamic LED headlamp))
- Right front LED matrix lamp unit control unit (with code 640 (High Performance LED) or code 641 (Left-hand drive dynamic LED headlamp) or code 642 (Right-hand drive dynamic LED headlamp))
- Electronic ignition switch control unit
- Drivetrain control unit
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- Electronic ignition switch control unit
- Drivetrain control unit
Radar-CAN 2 (with CODE 23P (Driving Assistance package))
Radar CAN 2 is used for the data exchange of the attached control units with one another. Radar CAN 2 operates at a data rate of 500 kBit/s.
The following control units are participants of radar CAN 2:
- Right outer rear bumper radar sensor
- Left outer rear bumper radar sensor
- Mercedes-Benz Intelligent Drive control unit
Gateway:
The Mercedes-Benz Intelligent Drive control unit forms the interface for data exchange between control units connected to other bus systems.
Steering wheel CAN
The steering wheel CAN serves for data exchange between the connected control units. The steering wheel CAN operates at a data transfer rate of 125 kBit/s.
The following control units are subscribers to the steering wheel CAN:
- Steering column module control unit
- Steering wheel electronics
- Lower multifunction steering wheel button group electric controller unit (with code U88 (AMG steering wheel buttons (AMG DRIVE UNIT)))
Gateway:
The steering column tube module control unit forms the interface for the data exchange with control units that are connected to other bus systems.
Fuel cells CAN (model 253.99)
The fuel cells CAN is used for the exchange of data between the connected control units. The fuel cells CAN operates at a data transfer rate of 500 kbit/s.
The following control units are subscribers on the fuel cells CAN:
- Exhaust air turbocharger
- Fuel tank control unit
- Fuel cell control unit
- Fuel cell management system control unit
- Drivetrain control unit
- Fuel cell DC/DC converter control unit
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- Fuel tank control unit
- Drivetrain control unit
Hydrogen supply CAN (model 253.99)
The hydrogen supply CAN is used for the exchange of data between the connected control units. The hydrogen supply CAN operates at a data transfer rate of 500 kbit/s.
The following control units are subscribers on the hydrogen supply CAN:
- Hydrogen sensor 1
- Hydrogen sensor 2
- Hydrogen sensor 3
- High-voltage crash sensor control unit
- Fuel tank control unit
Gateway:
The fuel tank module control unit forms the interface for the data exchange with control units that are connected to other bus systems.
Chassis FlexRay
The chassis FlexRay is a quick, deterministic and fault-tolerant bus system. Signals are not transmitted based on an event but during fixed defined time windows. As a result, the bus load can be reduced. The time windows are divided into static and dynamic sections.
The chassis FlexRay consists of a twisted two-core data line that transmits differential signals in order to improve the interference resistance. Each connected control unit is able to transmit or receive data in the form of voltage pulses.
The chassis FlexRay is used for the data exchange of the attached control units with one another. The chassis FlexRay operates at a data rate of up to 10 Mbit/s.
The following control units are participants of the chassis FlexRay:
- Stereo multifunction camera (with code 513 (Traffic Sign Assist), code 640 (High Performance LED) or code 641 (Left-hand drive dynamic LED headlamp) or code 642 (Right-hand drive dynamic LED headlamp) or code 23P (Driving Assistance Package))
- Mono multifunction camera (model 253.99)
- Distance Pilot DISTRONIC controller unit (model 205 with code 239 (Active Distance Assist DISTRONIC))
- Active Distance Assist DISTRONIC electric controller unit (model 253 with code 239 (Active Distance Assist DISTRONIC))
- Short and long-range radar sensor (with code 23P (Driving Assistance package))
- Electronic Stability Program control unit
- AIRmatic control unit (model 205 with CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRmatic))
- AIR BODY CONTROL control unit and AIR BODY CONTROL Plus control unit (model 253 with code 489 (AIR BODY CONTROL))
- Adaptive damping system control unit (with code 459 (DYNAMIC BODY CONTROL suspension with adjustable damping))
- Rear axle electronic level control system control unit (model 253.99)
- Parking system control unit (with code P44 (Parking Package) or code P47 (Parking Pilot with 360° camera))
- Mercedes-Benz Intelligent Drive control unit (with code 23P (Driving Assistance package))
- Electrical power steering control unit
- Electronic ignition switch control unit
- Steering column module control unit
- Drivetrain control unit
- Drive program control unit (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
- All-wheel drive control unit (model 253.388/389/988/989 with transmission 725.096)
Gateway:
The following control units form the interfaces for data exchange between control units connected to other bus systems:
- Electronic Stability Program control unit
- Electronic ignition switch control unit
- Drivetrain control unit
- Steering column module control unit
- Drive program control unit (with code 466 (Active engine mount) or code 467 (Electronic locking differential))
- Mercedes-Benz Intelligent Drive control unit (with code 23P (Driving Assistance package))
MOST
The MOST is an optical bus system. Here, data are transferred via fiber optic cable to the connected information, navigation, and communication components. The MOST operates with a data rate of 22 Mbit/s.
The following control units are participants on the MOST:
- Head unit
- Midline sound system amplifier control unit (model 205 with code 853 ("Midline" sound system))
- Sound system amplifier control unit (with code 810 (Sound system))
- TV tuner control unit (model 205, 253.99, with code 865 (TV tuner))
Gateway:
The head unit forms the interface for data exchange between control units connected to other bus systems.
Ethernet
The Ethernet vehicle access is used for data transfer to the head unit.
The Ethernet vehicle access operates with a data rate of 100 Mbit/s.
The bandwidth of 100 Mbit/s makes it possible, e.g. to program the Digital Owner's Manual, the head unit and the MOST components without a separate DVD.