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Home >> Mercedes Benz >> 2008 >> C 300 4MATIC (204.081) V6-3.0L (272.948) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Description and Operation >> GF00.19-P-0001CW Overall Network (GVN) Function

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




GF00.19-P-0001CW Overall Network (GVN) Function
- MODEL 204.0 up to Model Year 8







A1 Instrument cluster
A2 Radio (with code (510) Audio 20 with CD changer or with code (523) MB Audio 20 radio)
A2/56 Radio with auto pilot system (with code (511) Audio 50 APS with DVD changer or with code (525) MB Audio 50 APS radio)
A40/3 COMAND controller unit (with code (512) COMAND APS with DVD changer or with code (527) COMAND APS (with navigation system))
A40/8 Audio/COMAND display
A40/9 Audio/COMAND control panel
A76 Left front reversible emergency tensioning retractor (with code (299) PRE-SAFE)
A76/1 Right front reversible emergency tensioning retractor (with code (299) PRE-SAFE)
A98 Panoramic sliding roof control module (with code (413) Panoramic glass sunroof with top sliding sunroof)
B24/15 Yaw rate, lateral and longitudinal acceleration sensor
E1n1 Left xenon light control unit (with code (614) Bi-xenon headlamp unit or with code (622) Intelligent Light System (right-hand traffic))
E2n1 Right xenon light control unit (with code (614) Bi-xenon headlamp unit or with code (622) Intelligent Light System (right-hand traffic))
N2/10 Supplemental restraint system control unit
N3/9 CDI control unit (with diesel engine)
N3/10 ME-SFI [ME] control unit (with gasoline engine)
N10/1 Front SAM control unit with fuse and relay module
N10/2 Rear SAM control unit with fuse and relay module
N15/3 Electronic transmission control control unit (on transmission 722.6)
N15/5 Electronic selector lever module control unit (with transmission 722)
N22/7 Automatic air conditioning control and operating unit
N26/9 Special-purpose vehicle multifunction control unit (with code (965) Electrical preinstallation for rental vehicles)
N28/1 Trailer recognition control unit (with code (550) trailer hitch)
N30/4 Electronic Stability Program control unit
N32/1 Driver seat control unit (with code (275) Memory package (driver seat, steering column, mirrors))
N32/2 Front passenger seat control unit (with code (242) Electrically adjustable front passenger seat with memory)
N40/3 Sound system amplifier control unit (with code (810) Sound system)
N62 PARKTRONIC control unit (with code (220) Parktronic system (PTS))
N69/1 Left front door control unit
N69/2 Right front door control unit
N69/3 Left rear door control unit N69/4 Right rear door control unit
N69/5 Keyless-Go control unit (with code (889) Keyless-Go)
N70 Overhead control panel control unit (with code (414) Power glass tilting/sliding sunroof)
N73 Electronic ignition switch control unit
N80 Steering column module control unit
N87/3 Digital Audio Broadcasting control unit (with code (537) Digital radio)
N87/5 Satellite digital audio radio (SDAR) control unit (with code (536) SIRIUS satellite radio)
N88 Tire pressure monitor control unit (with code (470) Tire pressure monitor (standard))
N110 Weight Sensing System (WSS) control unit (with (USA))
N118 Fuel pump control unit (with gasoline engine)
N123/4 Emergency call system control unit (with code (359) TELE AID emergency call system)
Y3/8n4 Fully integrated transmission control control unit (with transmission 722.9)

General overall network
Controller Area Network (data bus/CAN bus) (CAN):
The CAN is an electrical bus system for the transmission of data on 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
- Readying sensor signals for several systems
- Reducing the number of electrical lines
- Improving the electromagnetic compatibility (EMC)

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

Media Oriented System Transport (MOST):
MOST is a networking system comprising a fiber optic cable that makes use of optical information transfer. With this system, data are transferred by light pulses. They are transmitted to the components connected to the MOST ring (e.g. audio components). The light pulses are then reconverted into electric signals in the receiver component.
Due to its high transfer rate, the MOST ring can simultaneously transmit source data (music, video, voice, etc.) and check data (commands, instructions etc.) without compromising the information content.

The MOST offers the following advantages:
- Extremely high data transfer rate
- Prevents tapping and crosstalk
- Data transmission is not sensitive to electromagnetic radiation
- Short-circuit resistance
- Potential-free connection of the MOST ring subscribers
- No oxidation
- Low weight of fiber optic cable
- Small line diameter

Moreover, various components are connected to the control units via local interconnect network (LIN).
The following various LINs are installed:
- Instrument panel LIN
- Wiper/inside rearview mirror LIN
- Rear SAM LIN
- Left door LIN
- Right door LIN
- On-board electrical system LIN
- Climate control LIN
- Drive train LIN
- Steering LIN

More information on these connections can be found in the corresponding function descriptions.

Data transfer between the bus systems
The following control units form the interface between the bus systems:
- The front SAM control unit connects the interior CAN, diagnostic CAN, chassis CAN, and the front end CAN
- The radio or the COMAND controller unit connects the telematics CAN, interior CAN, and the MOST
- The Electronic Stability Program control unit connects the chassis CAN to the vehicle dynamics CAN
- The CDI control unit or the ME-SFI [ME] control unit connect the drive train CAN to the chassis CAN

Telematics CAN
The telematics CAN is responsible for telecommunication data transfer. The telematics CAN operates at a transfer rate of 125 kBit/s.

The telematics CAN interconnects the following control units:
- Radio or COMAND controller unit
- Audio/COMAND display
- Audio/COMAND control panel

Interior CAN
The interior CAN is responsible for data transfer 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, etc.). The interior CAN operates at a transfer rate of 125 kBit/s.

The following control units are connected to each other over the interior CAN:
- Instrument cluster
- Radio or COMAND controller unit
- Panoramic sliding roof control module
- front SAM control unit
- Rear SAM control unit
- Automatic air conditioning control and operating unit
- Special-purpose vehicle multifunction control unit
- Trailer recognition control unit
- Driver seat control unit
- Front passenger seat control unit
- PARKTRONIC control unit
- Left front door control unit
- Right front door control unit
- Left rear door control unit
- Right rear door control unit
- KEYLESS GO control unit
- Overhead control panel control unit
- Electronic ignition switch control unit
- Tire pressure monitor control unit
- Weight Sensing System (WSS) control unit

Drive train CAN
The drive train CAN is responsible for data transfer for the drive systems. The drive train CAN operates at a transfer rate of 500 kBit/ s.

The following control units are connected to each other over the drive train CAN:
- CDI control unit or ME-SFI [ME] control unit
- Electronic transmission control control unit or fully integrated transmission control control unit
- Fuel pump control unit
- Electronic selector lever module control unit

Diagnostic CAN
The diagnostic CAN is responsible for the data transfer of diagnostic data and for the connection of an external diagnostic unit (e.g. STAR DIAGNOSIS) and the emergency call system control unit. The diagnostics CAN operates at a transfer rate of 500 kBit/s.

The following control units are connected to each other over the diagnostics CAN:
- front SAM control unit
- Emergency call system control unit

Chassis CAN
The chassis CAN is responsible for data transfer between the chassis systems. The chassis CAN operates at a transfer rate of 500 kBit/s.

The following control units are connected to each other over the chassis CAN:
- Instrument cluster
- Left front reversible emergency tensioning retractor
- Right front reversible emergency tensioning retractor
- CDI control unit or ME-SFI [ME] control unit
- Supplemental restraint system control unit
- front SAM control unit
- Electronic Stability Program control unit
- Electronic ignition switch control unit
- Steering column module control unit

Front end CAN
The front end CAN is responsible for the data transfer between the xenon light control units as well as to the front SAM control unit. The front end CAN operates at a transfer rate of 500 kBit/s.

The following control units are connected to each other over the front end CAN:
- front SAM control unit
- Left xenon lamp control unit
- Right xenon light control unit

Vehicle dynamics CAN
The vehicle dynamics CAN is responsible for the data transfer of driving dynamics data (e.g. rotational speed, longitudinal acceleration, etc.). The vehicle dynamics CAN operates at a transfer rate of 500 kBit/s.

The following control units are connected to each other over the vehicle dynamics CAN:
- Yaw rate, lateral and longitudinal acceleration sensor
- Electronic Stability Program control unit

MOST
MOST is an optical data bus system. Here, data is transferred via fiber optic cables to the connected information, navigation, and communication components. The MOST operates with a transfer rate of 22 Mbits/s.

The MOST interconnects the following control units:
- Radio or COMAND controller unit
- Sound system amplifier control unit
- Digital Audio Broadcasting control unit
- SDAR control unit








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