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Home >> Mercedes Benz Truck >> 2012 >> R 350 4MATIC (251.157) V6-3.5L (276.958) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Description and Operation >> GF00.19-P-0001GM Overall Network (GVN) Function

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




GF00.19-P-0001GM Overall Network (GVN) Function
- MODEL 164.1 as of model year 2009 /YoM 08 model refinement package
- MODEL 164.8, 251.0 /1 as of model year 2009 /YoM 08

Overall network, general
The heightened requirements placed on vehicle electronics, e.g. in the following areas:
- Vehicle safety
- Drive
- 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 over 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
- Reducing the number of electrical lines
- Improving the electromagnetic compatibility (EMC)

The following CAN systems are involved in the overall network:
- Telematics CAN (CAN A)
- Interior CAN (CAN B)
- Engine compartment CAN (CAN C)
- Drive train CAN (CAN C1) (in model 164.195)
- Diagnostic CAN (CAN D)
- Vehicle dynamics CAN (CAN H)
- Drive train sensor CAN (CAN I)
- Hybrid CAN (CAN L) (in model 164.195)

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 participants on the telematics CAN:
- DVD player (A40/4) (with code (864) Rear entertainment system)
- Left rear display (A40/5) (with code (864) Rear entertainment system)
- Right rear display (A40/6) (with code (864) Rear entertainment system)
- TV combination tuner (analog/digital) (A90/1) (with code (863) Digital/analog TV tuner) or Digital TV tuner (A90/3) (with code (865) TV tuner)

Gateway:
The DVD player and the TV tuner form the interface for the data exchange between the telematics CAN and 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 transfer rate of 125 kBit/s.

The following control units are participants on the interior CAN:
- Instrument cluster (A1)
- Radio (A2) (with code (510) Audio 20 with CD changer or code (523) MB Audio 20 radio)
- Radio and navigation unit (A2/56) (with code (511) Audio 50 APS with DVD changer or code (525) MB Audio 50 APS radio)
- COMAND operating, display and controller unit (A40/3) (with code (512) COMAND APS with DVD changer or code (527) COMAND APS (with navigation) or code (528) COMAND incl. DVD changer)
- STH control unit (A6n1) (with code (228) Stationary heater)
- DVD player (with code (864) Rear entertainment system)
- Electronic compass (B26) (with code (245) Electronic compass)
- WSS (weight sensing system) control unit (N2/13) (with code (494) USA version)
- Front SAM control unit (N10)
- Rear SAM control unit (N10/8)
- AAC [KLA] control and operating unit (N22) (without code (581) Comfort automatic air conditioning) or C-AAC control and operating unit (N22/7) (with code (581) Comfort automatic air conditioning)
- Seat heater, seat ventilation and steering wheel heater control unit (N25/7) (with code (872) Electric seat heater for left and right rear seat, code (401) Front comfort seats, incl. seat heating and seat ventilation or code (443) Steering wheel heater)
- Driver-side front seat adjustment control unit with memory (N32/1) (with code (275) Memory package (driver seat, steering column, mirrors))
- Passenger-side front seat adjustment control unit with memory N32/2 (with code (242) Electrically adjustable front passenger seat with memory)
- Folding rear bench seat control unit (N32/26) (model 164.8 with code (845) 3rd seat row folding down electrically)
- PTS control unit (N62) (with code (220) PARKTRONIC)
- Reversing camera control unit (N66/2) (with code (218) Reversing camera and code (498) Japan version)
- Left front door control unit (N69/1)
- Right front door control unit (N69/2)
- Keyless-Go control unit (N69/5) (with code (889) Keyless-Go)
- Overhead control panel control unit (N70)
- Upper control panel control unit (N72/1)
- RCP [HBF] control unit (N72/2)
- EZS control unit (N73)
- TPM [RDK] control unit (N88) (up to 30.6.09 with code (470) Tire pressure monitor (standard) or code (475) Tire pressure monitor (premium))
- Central gateway control unit (N93)
- Rear-end door closing control unit (N121/1) (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:
- Radio or COMAND controller unit
- DVD player
- Central gateway control unit

The instrument cluster and the EZS control unit are also connected to the engine compartment CAN but do not have a gateway function.

Engine compartment CAN
The engine compartment CAN is used for exchanging data between the connected control units. 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
- Left front reversible emergency tensioning retractor (A76)
- Right front reversible emergency tensioning retractor (A76/1)
- Intelligent servo module for DIRECT SELECT (A80)
- Electrohydraulic power steering (A91/1) (model 164.120/122/822/825 as of 1.6.09, model 164.121/124/125/824, model 251.020/022/026/122/125/126 as of 1.6.09, model 251.023/025/121/123/124)
- Left rear bumper intelligent radar sensor (B29/4) (with code 234) Blind Spot Assist)
- Right rear bumper intelligent radar sensor (B29/5) (with code 234) Blind Spot Assist)
- Xenon headlamp control unit (E1n1) (model 164 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), model 251 as of 1.8.10 with code (614) Bi-xenon headlamp unit or code (618) Bi-xenon headlamp)
- Xenon headlamp control unit (E2n1) (model 164 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), model 251 as of 1.8.10 with code (614) Bi-xenon headlamp unit or code (618) Bi-xenon headlamp)
- Restraint systems control unit (N2/7)
- CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine)
- Transfer case control unit N15/7 (model 164 with CODE (430) off-road package)
- Rear axle lock control unit (N15/9) (model 164 with code (430) off-road package)
- Electric refrigerant compressor control unit (N19/4) (in model 164.195)
- Regenerative braking system control unit (N30/6) (in model 164.195)
- ESP control unit (N47-5) (except model 164.195)
- AIRMATIC with ADS control unit (N51) (model 251 with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system ADS))
- AIRmatic control unit (N51) (model 164.1 with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system ADS) or with model 164.8)
- Headlamp range adjustment control unit (N71) (model 251 up to 31.7.10 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination)
- EZS control unit
- Steering column tube module (N80)
- TPM [RDK] control unit (as of 1.7.09 with code (470) Tire pressure monitor (standard) or code (475) Tire pressure monitor (premium))
- Rear axle level control system control unit (N97) (model 251 with code (488) Steel/air suspension)
- Central gateway control unit
- Control unit for fully integrated transmission control (Y3/8n4)

Gateway:
The following control units form the interface for the data exchange between the engine compartment CAN and other bus systems:
- ME-SFI control unit or CDI control unit
- Regenerative braking system control unit or ESP control unit
- Central gateway control unit

The instrument cluster and the EZS control unit are also connected to the interior CAN but do not have a gateway function.

Drive train CAN (in model 164.195)
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 are participants on the drive train CAN:
- Electrohydraulic power steering
- ME-SFI [ME] control unit
- Fuel system control unit (N118)
- Power electronics control unit (N129/1)

Gateway:
The following control units form the interface for the data exchange between the drive train CAN and other bus systems:
- ME-SFI [ME] control unit
- Power electronics 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 transfer rate of 500 kBit/s.

The following control units are participants on the diagnostic CAN:
- Central gateway control unit
- Fuel system control unit (with engine 272, 273, 276)
- Left fuel system control unit (N118/3) (with engine 156 in model 164)
- Right fuel system control unit (N118/4) (with engine 156 in model 164)
- Emergency call system control unit (N123/4) (with code (359) TELE AID emergency call system)

Gateway:
The central gateway control unit forms the interface for data exchange between the diagnosis 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 participants on the vehicle dynamics CAN:
- DTR controller unit (A89) (with code (219) Distronic (DTR))
- Yaw rate, lateral and longitudinal acceleration sensor (B24/15)
- Regenerative braking system control unit or ESP control unit

Gateway:
The regenerative braking system control unit or the ESP control unit forms the interface for the data exchange between the vehicle dynamics CAN and the other bus systems.

Drive train sensor CAN
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 transfer rate of 500 kBit/s.

The following control units are participants on the drive train sensor CAN:
- ME-SFI [ME] control unit (engine 276) or
- CDI control unit (engine 642)
- Left NOx sensor control unit (N37/5) (engine 276 with stratified operation)
- Right NOx sensor control unit (N37/6) (engine 276 with stratified operation)
- NOx control unit downstream of diesel particulate filter (N37/7) (engine 642 with code (U42) BlueTec (SCR) diesel exhaust treatment)
- NOx control unit downstream of SCR catalytic converter (N37/8) (engine 642 with code (U42) BlueTec (SCR) diesel exhaust treatment)
- AdBlue� control unit (N118/5) (engine 642 with code (U42) BlueTEC (SCR) diesel exhaust treatment)

Gateway:
The ME-SFI [ME] control unit or the CDI control unit forms the interface for data exchange between the drive train sensor CAN and other bus systems.

Hybrid CAN (in model 164.195)
The hybrid CAN is used for the data exchange of the connected control units with one another. The hybrid CAN operates at a transfer rate of 500 kbit/s.

The following control units are subscribers to the hybrid CAN:
- Battery management system control unit (A100n1)
- ME-SFI [ME] control unit
- DC/DC converter control unit (N83/1)
- Power electronics control unit
- Hybrid vehicle fully integrated transmission control controller unit (Y3/10)

Gateway:
The following control units form the interface for the data exchange between the hybrid CAN and other bus systems:
- ME-SFI [ME] control unit
- Power electronics control unit

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 participants on the MOST:
- Radio or COMAND controller unit
- 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)
- High definition tuner control unit (N87/8) (with code (517) HD radio)
- Media interface control unit (N125/1) (with code (518) Media interface)

Gateway:
The following control units form the interface for the data exchange between the MOST and the other bus systems:
- Radio or COMAND controller unit
- TV tuner














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