GF00.19-P-0001TXM Overall Network (GVN) Function
GF00.19-P-0001TXM Overall Network (GVN) Function
- MODEL 219.3 as of model year 08/YoM 07
Networking of the control units, illustrated with engine 272 and transmission 722.9
CAN-B Controller Area Network bus, class B (interior compartment) (CAN B)
CAN-C Controller Area Network, bus Class C (engine compartment) (CAN-C)
CAN-D Controller Area Network bus class D (diagnosis)
LIN Local interconnect network
MFL Multifunction steering wheel
A1 Instrument cluster
A89 DTR controller unit
G2 Generator
N3/10 ME-SFI [ME] control unit
N15/5 Electronic selector lever module 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
X11/4 Data link connector
Y3/8n4 Fully integrated transmission control (VGS) control unit
Control unit networking, except code 494 USA version and except code 498 Japan version
A1 Instrument cluster
A2 Radio
A2/56 Radio control panel and navigation unit
A6n1 STH control unit
A40/3 COMAND operating, display and controller unit
N2/7 Restraint systems control unit
N10/1 Driver-side SAM control unit with fuse and relay module
N10/2 Rear SAM control unit with fuse and relay module
N10/11 Passenger-side SAM control unit
N22 AAC [KLA] control and operating unit
N22/7 Comfort AAC control and operating unit (with code 581 Comfort automatic air conditioning)
N25/7 HS [SIH] and seat ventilation 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 module front left
N69/2 Door control module front right
N69/3 Door control module rear left
N69/4 Door control module rear right
N70 Overhead control panel control unit
N72 Lower control panel control unit
N72/1 Upper control panel control unit
N73 EIS [EZS] control unit
N80 Steering column module
N88 TPM [RDK] control unit
N93 Central gateway control unit
N93/1 Audio gateway control unit
N121 TLC [HDS] control unit
MOST shown except code 494 USA version and except code 498 Japan version:
CAN-B Controller Area Network bus, class B (interior compartment) (CAN B)
MOST Media Oriented System Transport
W Wake-up line
A2 Radio
A2/56 Radio control panel and navigation unit
A40/3 COMAND operating, display and controller unit
A90/1 TV combination tuner (analog/ digital)
N40/3 Amplifier for sound system
N87/3 Digital Audio Broadcasting control unit
N125/1 Media interface control unit
MOST shown with code 494 USA version and with code 536 SIRIUS satellite radio
CAN-B Controller Area Network bus, class B (interior compartment) (CAN B)
MOST Media Oriented System Transport
W Wake-up line
A2 Radio
A2/56 Radio control panel and navigation unit
A40/3 COMAND operating, display and controller unit
N40/3 Amplifier for sound system
N87/5 SDAR control unit
N125/1 Media interface control unit
MOST shown with code 498 Japan version
Overall network
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 data bus line.
Data bus systems
5 data bus systems are involved in the networking:
- Controller area network bus class B (interior compartment) (CAN B)
- Controller Area Network bus, class C (engine compartment) (CAN C)
- Controller Area Network bus class D (diagnosis) (CAN-D)
- media-oriented system transport (MOST)
- Local Interconnect Network (LIN)
The operational field is differentiated as follows:
- 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.
- The MOST networks the control units of the audio systems via a fiber optic cable.
- The LIN bus is used where rather simple control and monitoring tasks are to be performed in the vehicle.
Higher requirements are placed on the CAN-C with regard to immunity to interference, e.g. electromagnetic effect or radiation, and the data transfer rate.
Controller Area Network (data bus/CAN bus) systems
The CAN bus systems are two-wire data bus systems. They differ from one another in terms of transfer rate depending on the requirement.
MOST bus
The MOST bus is an optical data bus system. Here the data are transferred via fiber optic cables to the connected control units for information, navigation, and communication systems.
LIN bus
The LIN bus is a single-wire data bus system. A LIN bus is used between the multifunction steering wheel and the steering column tube module, for example.
Data exchange between the data bus systems
The radio, the radio control panel and navigation unit or the COMAND operating, display and controller unit forms the interface (Gateway) for data exchange between the MOST and the CAN-B. The central gateway control unit is the interface for data interchange between the CAN-B and the CAN-C. It also represents the interface via CAN-D to the data link connector to enable the control units to be tested using STAR DIAGNOSIS.
The steering column module, the instrument cluster and the EIS [EZS] control unit are connected both to the CAN-B and 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 signals of the switch actuations on the steering column module and all the signals of the button actuations on the multifunction steering wheel (MFL) over the LIN bus and places these signals on the CAN-B. The steering angle at the steering wheel is sensed electronically via the steering angle sensor (N49). The signals of the steering angle are placed on CAN-C via the steering column module.
