GF00.19-P-0001RI Overall Network (GVN) Function

GF00.19-P-0001RI Overall Network (GVN) Function
- MODEL 230.4 as of model year 2009 /YoM 08 model refinement package

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 (data bus/CAN bus) (CAN)
- Media Oriented System Transport (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
- Reduces number of electrical lines
- Improves electromagnetic compatibility

The following CAN systems are involved in the overall network:
- Interior CAN (CAN B)
- Engine compartment CAN (CAN C)
- Diagnostic CAN (CAN D)
- Vehicle dynamics CAN (CAN H)
- Electrohydraulic brake CAN (CAN EHB) (without code (P99) Special model "AMG Black Series")

Interior CAN
The interior CAN is responsible for data transfers in the vehicle interior. It interconnects the different systems that can be operated by the driver or the front passenger (e.g. power windows, climate control). The interior CAN operates at a transfer rate of 125 kBit/s.

The following control units are subscribers to the interior CAN:
- Instrument cluster (A1)
- PSE controller unit with combined functions (A37)
- COMAND operating, display and control unit (A40/3)
- Restraint systems control unit (N2/7)
- Rear SAM control unit (N10/8)
- Driver-side SAM control unit (N10/10)
- Right SAM control unit (N10/11)
- AAC [KLA] control and operating unit (N22)
- AIRSCARF control unit (N25/7) (with code (403) AIRSCARF system)
- Front seat adjustment control unit with memory, left (N32/1) (without code (P99) Special model "AMG Black Series", with code (P99) Special model "AMG Black Series" with code (494) USA version)
- Front seat adjustment control unit with memory, right (N32/2) (without code (P99) Special model "AMG Black Series", with code (P99) Special model "AMG Black Series" with code (494) USA version)
- Roll bar Vario roof control (RVC [UVS]) control unit (N52) (without code (P99) Special model "AMG Black Series")
- PTS control unit (N62) (with code (220) PARKTRONIC)
- Left door control unit (N69/1)
- Right door control unit (N69/2)
- Keyless-Go control unit (N69/5) (with code (889) Keyless-Go)
- Overhead control panel control unit (N70)
- Lower control panel control unit (N72)
- EIS [EZS] control unit (N73)
- Steering column tube module (N80)
- Vehicle power supply control unit (N82/1)
- TPM [RDK] control unit (N88) (with code (470) Tire pressure monitor (standard) or code (475) Tire pressure monitor (premium))
- Central gateway control unit (N93)
- WSS (Weight Sensing System) control unit (N110) (with code (494) USA version)
- AMG DRIVE UNIT control unit (N145) (with transmission 722.930 or code (P99) Special model "AMG Black Series")

Gateways:
The following control units form interfaces for the exchange of data between the interior CAN and other bus systems:
- Central gateway control unit (interface to engine compartment CAN and diagnostic CAN)
- COMAND operating, display and controller unit (interface to the MOST)

Engine compartment CAN
The engine compartment CAN is responsible for the data transfer between the drive and chassis systems. The engine compartment CAN operates at a transfer rate of 500 kBit/s.

The following control units are subscribers to the engine compartment CAN:
- Instrument cluster
- DTR controller unit (A89) (with code (219) Distronic (DTR))
- ME-SFI [ME] control unit (N3/10)
- ETC [EGS] control unit (N15/3) (with transmission 722.6)
- Electronic selector lever module control unit (N15/5)
- ESP, SPS [PML] and BAS control unit (N47-5)
- ABC control unit (N51/2) (with code (487) Active Body Control (ABC))
- EIS [EZS] control unit
- Steering column module
- Central gateway control unit
- Fully integrated transmission control unit (VGS) (Y3/8n4) (with transmission 722.9)

Gateway:
The following control unit forms the interface for the exchange of data between the engine compartment CAN and the other bus systems:
- Central gateway control unit (interface to interior CAN and diagnostic CAN)

Diagnostic CAN
An external tester (e.g. Star Diagnosis) can be connected to the diagnostic CAN via the data link connector (X11/4). The diagnostic CAN operates at a transfer rate of 500 kBit/s.

The following control units are connected to the diagnostic CAN:
- Central gateway control unit
- Xenon headlamp control unit (E1n1)
- Xenon headlamp control unit (E2n1)
- Fuel pump control unit (N118) (with code (P99) Special unit "AMG Black Series")
- Emergency call system control unit (N123/4) (for code (359) TELE AID emergency call system)
- External tester (e.g. STAR DIAGNOSIS)

Gateway:
The following control unit forms the interface for the data exchange between the diagnostic CAN and the other bus systems:
- Central gateway control unit (interface to interior CAN and engine compartment CAN)

Vehicle dynamics CAN
The vehicle dynamics CAN connects the yaw rate and lateral acceleration sensor (B24/15) and the ESP, SPS [PML] and BAS control unit.

EHB CAN (without code (P99) Special model "AMG Black Series")
The following control units of the Sensotronic Brake Control (SBC) system are connected to the CAN EHB for exchanging data:
- SBC control unit (A7/3n1) (without code (P99) Special model "AMG Black Series")
- ESP, SPS [PML] and BAS control unit

MOST
MOST is an optical networking 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 connected to MOST:
- COMAND operating, display and controller unit
- TV combination tuner (analog/digital) (A90/1) (with code (863) Digital/analog TV tuner)
- TV digital tuner (A90/3) (with code (865) TV tuner)
- Amplifier for sound system (N40/3) (with code (810) Sound system)
- Digital Audio Broadcasting control unit (N87/3) (with code (537) Digital radio and code (833) Great Britain version)
- SDAR control unit (N87/5) (with code (517) HD radio or code (536) SIRIUS satellite radio)
- Media interface control unit (N125/1) (with code (518) Media interface)

Gateway:
The following control unit forms the interface for the exchange of data between the MOST and the interior CAN:
- COMAND operating, display and controller unit