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Home >> Mercedes Benz Truck >> 2008 >> R 320 CDI (251.122) V6-3.0L DSL Turbo (642.950) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Description and Operation >> GF00.19-P-0001RT Overall Network (GVN) Function

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




GF00.19-P-0001RT Overall Network (GVN) Function
- MODEL 251
- with CODE (494) USA version
- up to Model Year 8

Shown is the block diagram before the production period 31.05.2006







A1 Instrument cluster
A76 Left front reversible emergency tensioning retractor
A76/1 Right front reversible emergency tensioning retractor
A80 Intelligent servo module for DIRECT SELECT
A89 DTR controller unit
B24/15 Micromechanical turn rate sensor AY pickup
G2 Alternator
N2/7 Restraint systems control unit
N3/10 ME control unit
N47-5 ESP control unit
N51 AIRmatic with ADS control unit
N71 Headlamp range adjustment control unit
N73 EIS [EZS] control unit
N80 Steering column module
N93 Central gateway control unit
N97 Rear axle level control system control unit
N123/4 Emergency call system control unit
X11/4 Data link connector
Y3/8 Electric controller unit (VGS)
CAN B Controller Area Network bus class B (interior)
CAN-C Control Area Network bus class C (engine compartment)
CAN-D Controller Area Network bus class D (diagnosis)
CAN-H Controller Area Network bus class H (vehicle dynamics)
LIN Local interconnect network (LIN)
MFL Multifunction steering wheel

Shown is block diagram as of production period 01.06.2006







A1 Instrument cluster
A76 Left front reversible emergency tensioning retractor
A76/1 Right front reversible emergency tensioning retractor
A80 Intelligent servo module for DIRECT SELECT
A89 DTR controller unit
B24/15 Micromechanical turn rate sensor AY pickup
G2 Alternator
N2/7 Restraint systems control unit
N3/9 CDI control unit
N3/10 ME control unit
N14/3 Glow time output stage
N47-5 ESP control unit
N51 AIRmatic with ADS control unit
N71 Headlamp range adjustment control unit
N73 EIS [EZS] control unit
N80 Steering column module
N93 Central gateway control unit
N97 Rear axle level control system control unit
N123/4 Emergency call system control unit
X11/4 Data link connector
Y3/8 Electric controller unit (VGS)
Y3/8n4 Fully integrated transmission control (VGS) control unit
CAN B Controller Area Network bus class B (interior)
CAN-C Control Area Network bus class C (engine compartment)
CAN-D Controller Area Network bus class D (diagnosis)
CAN-H Controller Area Network bus class H (vehicle dynamics)
LIN Local interconnect network (LIN)
MFL Multifunction steering wheel

Shown is block diagram before the production period 31.05.2006







1 Center nozzles air flap control
2 Rear fond blower motor air flap control
3 MOST bus
A1 Instrument cluster
A40/4 DVD player
B26 Electronic compass
N2/13 WSS (Weight Sensing System) control unit
N10 Front SAM ECU
N10/8 Rear SAM control unit
N22 AAC [KLA] control and operating unit
N22/7 Comfort AAC control and operating unit
N25/7 HS [SIH], seat ventilation and steering wheel heater control unit
N32/1 Driver front seat adjustment control unit with memory
N32/2 Front passenger front seat adjustment control unit with memory
N62 PTS control unit
N69/1 Door control unit front left
N69/2 Door control unit front right
N69/5 Keyless Go control unit
N70 Overhead control panel control unit
N72 Lower control panel control unit
N72/1 Upper control panel control unit
N72/2 RCP [HBF] control unit
N73 EIS [EZS] control unit
N80 Steering column module
N88 TPM [RDK] control unit
N93 Central gateway control unit
N121/1 Rear-end door closing control unit
S1 Rotary light switch
CAN B Controller Area Network bus class B (interior)
CAN-C Control Area Network bus class C (engine compartment)
MOST Media Oriented System Transport (MOST)
LIN Local interconnect network (LIN)

Shown is the block diagram as of the production period 01.06.2006







1 Center nozzles air flap control
2 Rear fond blower motor air flap control
3 MOST bus
A1 Instrument cluster
A40/4 DVD player
A40/5 Left rear display
A40/6 Right rear display
B26 Electronic compass
N2/13 WSS (Weight Sensing System) control unit
N10 Front SAM ECU
N10/8 Rear SAM control unit
N22 AAC [KLA] control and operating unit
N22/7 Comfort AAC control and operating unit
N25/7 HS [SIH], seat ventilation and steering wheel heater control unit
N32/1 Driver front seat adjustment control unit with memory
N32/2 Front passenger front seat adjustment control unit with memory
N62 PTS control unit
N69/1 Door control unit front left
N69/2 Door control unit front right
N69/5 Keyless Go control unit
N70 Overhead control panel control unit
N72 Lower control panel control unit
N72/1 Upper control panel control unit
N72/2 RCP [HBF] control unit
N73 EIS [EZS] control unit
N80 Steering column module
N88 TPM [RDK] control unit
N93 Central gateway control unit
N121/1 Rear-end door closing control unit
S1 Rotary light switch
CAN-A Controller Area Network bus Class A (telematics)
CAN B Controller Area Network bus class B (interior)
CAN-C Control Area Network bus class C (engine compartment)
MOST Media Oriented System Transport (MOST)
LIN Local interconnect network (LIN)

Shown is block diagram before the production period 31.05.2006







A2/6 CD changer
A40/3 COMAND operating, display and controller unit
N40/3 Amplifier for sound system
N87/5 SDAR control unit
N123/1 Universal Portable CTEL Interface (UPCI [UHI]) control unit
CAN B Controller Area Network bus class B (interior)
MOST Media Oriented System Transport (MOST)
W Wake-up line

Shown is the block diagram as of the production period 01.06.2006







A2/6 CD changer
A40/3 COMAND operating, display and controller unit
N40/3 Amplifier for sound system
N41/3 Voice control system (VCS [SBS]) control unit
N87/5 SDAR control unit
N123/1 Universal Portable CTEL Interface (UPCI [UHI]) control unit
CAN B Controller Area Network bus class B (interior)
MOST Media Oriented System Transport (MOST)
W Wake-up line

Overall network
The further development of driver information systems as well as the spread of, for example, video-based, driver assistance systems (backup camera, ambient sensor technology etc.) are reflected in the requirements on the data bus systems.
A data bus is a data collection line, the data of which can be used by all the control units connected.

Function
Most control units of the vehicle are linked to each other via data bus lines, in other words there is no direct electrical connection between a sensor and the executing actuator.

A corresponding message (data) is generated using the sensor signal and made available to the data bus system. However, the data flow must be controlled using an access procedure (log) if all control units utilize a common bus line.

Data bus systems
7 data bus systems are involved in the networking:
- Controller Area Network bus Class A (telematics)
- Controller Area Network bus class B (interior)
- Control Area Network bus class C (engine compartment)
- Controller Area Network bus class D (diagnosis)
- Controller Area Network bus class H (vehicle dynamics)
- Local interconnect network (LIN)
- Media Oriented System Transport (MOST)

The operational field is differentiated as follows:
- CAN-A guarantees communication between the rear displays and the DVD-player.
- CAN-B links the control units of systems located in the vehicle interior (e.g. power windows, heated rear window etc.).
- CAN-C links the control units for the drive and chassis systems (e.g. engine, transmission control etc.).
- CAN-D links the central gateway control unit with the data link connector to perform diagnosis on all networked control units.
- CAN-H networks the chassis system (ESP) with the distance control system (Distronic controller unit).
- MOST links the control units of the audio systems and navigation systems (e.g. telephone, voice control etc.) via a fiber optic cable.
- The LIN bus is used where rather simple control and monitoring tasks are to be performed in the vehicle.

CAN bus systems
CAN bus systems refer to double-wire bus systems. They differ from one another in terms of transfer rate.
The CAN B bus is the slowest.

Higher requirements are placed on the CAN C with regard to immunity to interference, e.g. with respect to electromagnetic effect or radiation and the data transfer rate.

MOST bus
The MOST bus is an optical bus system. Here the data are transferred via fiber optic cables to the connected control units for information, navigation, and communication systems. It has the fastest transfer rate.

LIN bus
The LIN bus is a single-wire bus system. Compared to the other bus systems, the LIN bus is slow.

Application area of LIN-BUS:
- Between the multifunction steering wheel and the steering column module
- In the air conditioning
- Between the upper control panel control unit and lower control panel control unit
- Between the upper control panel control unit and the rotary light switch
- Between the TPM [RDK] control unit) and left rear TPM [RDK] wheel antenna (A2/46) and right rear TPM [RDK] wheel antenna (A2/47)
- Between the left front door control unit and driver power window and outside mirror adjustment switch group (S20/1)

Data exchange between data bus systems
The radio or the COMAND operating, display and controller unit forms the interface (gateway) for data exchange between the MOST and CAN-B. The central gateway control unit is the interface for data interchange between the CAN-B and the CAN-C.
Likewise it is the interface via CAN-D to the data link connector, in order to be able to check the control units connected to the different bus systems using STAR DIAGNOSIS.
The steering column module, the instrument cluster and the EIS [EZS] control unit are connected with the CAN B as well as with the CAN C. However, they do not act as an interface (gateway) between the two data bus systems. The steering column module reads in the switch operations at the steering column module as well as all button operations on the multifunction steering wheel via the LIN bus and places them on CAN-B. The angle of the steering wheel is measured by the steering angle sensor (N49) and transferred to the CAN C bus via the steering column module.








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