GF00.19-P-0001QU Extended Vehicle Network (GVN) Function

GF00.19-P-0001QU Extended Vehicle Network (GVN) Function
- MODEL 209.3 /4 up to 31.5.04
- with CODE (491) USA version







A1 Instrument cluster
A2 Radio
A6n1 STH control unit
A40/3 COMAND operating, display and control unit
N2/7 Restraint systems control unit
N10/1 Front SAM control unit with fuse and relay module
N10/2 Rear SAM control unit with fuse and relay module
N22 AAC control and operating unit
N22/6 Rear control unit (model 209.3 only)
N22/7 AAC comfort pushbutton control unit
N28/1 Trailer recognition control unit
N32/1 Driver front seat adjustment control unit with memory and easy entry, driver
N32/2 Front passenger front seat adjustment control unit with memory and easy entry
N52 Power soft top control unit (model 209.4 only)
N62 PTS control unit
N69/1 Left door control unit
N69/2 Right door control unit
N70 Overhead control panel control unit
N72 Lower control panel control unit
N72/1 Upper control panel control unit
N73 EIS control unit
N80 Steering column module







A1 Instrument cluster
N3/10 ME-SFI [ME] control unit
N15/3 ETC control unit
N15/5 Electronic selector lever module control unit
N15/6 automated manual transmission control unit
N47-5 ESP and BAS control unit
N63/1 DTR control unit
N73 EIS control unit
N80 Steering column module







A2 Radio
A2/6 CD changer (in glove compartment)
A2/13 Sound amplifier
A34/4 Telephone interface
A35/8 E-call control unit
A35/11 Voice control system control unit
A40/3 COMAND operating, display and control unit

Extended vehicle network
The further development of driver information systems as well as the spread of driver-supporting systems (e.g. backup camera, ambient sensor technology), are reflected in the requirements on data bus systems.
A data bus is a data collection line, the data of which can be used by all the control units connected.
Controller Area Network (data bus/CAN bus) (CAN) in automotive engineering means that data exchange takes place between all control units in a vehicle.

Function
The majority of control units are networked by means of data bus lines. Control commands or messages are coded and sent to the data bus message or address orientated, with each control unit having different priorities, i.e. access rights. These coded commands or messages can only be received by control units with authorized access.
The corresponding actuators are then actuated by these control units. In certain cases, various received messages are also combined in a control unit to form a new message. The new message is then also available for other control units on the data bus system.

Basically 3 data bus systems are involved in the networking:
- Controller Area Network bus Class B (interior) (CAN-B)
- Controller Area Network bus Class C (engine compartment) (CAN-C)
- Digital databus (D2B)

The operational fields differentiate as follows:
- CAN-B networks the control units for the convenience functions and lighting equipment in the vehicle (e.g. power window, heated rear window, external and interior lights).
- CAN-C networks the control units for the drive and chassis systems (e.g. engine, transmission control).
- D2B uses a fiber optical cable to network the control units for the audio and navigation system (e.g. telephone).

In respect of the interference immunity, e.g. against electromagnetic effects or radiation and the high data transfer rate, higher requirements are placed on the engine compartment CAN-C.

Data transfer between the bus systems
The following control units form the interface between the bus systems:
- The electronic ignition switch (EIS) control unit (N73) connects the CAN-B and CAN-C.
- The COMAND operating, display and control unit (A40/3) or the radio (A2) forms the interface between the CAN-B and D2B.

The EIS control unit (N73) is also the interface between the control units on the CAN-B and the line to the data link connector (X11/4) for STAR DIAGNOSIS.

Steering column module (N80) and instrument cluster (A1)
Although the instrument cluster (A1) and the steering column module (N80) are connected both to the CAN-B as well as to CAN-C and exchange data with both systems, they do not act as an interface (gateway) between the two bus systems.

The internationally standardized network management "OSEK" (open systems and their interfaces for electronics in vehicles) is used for all the control units on the CAN-B.

D2B
The D2B (digital data bus) is an optical bus system. Data is carried to the network's control units via fiber optic cables. Among the control units linked to the D2B are:
- COMAND operating, display and control unit or radio,
- sound amplifier,
- CD player with changer
- The data between the interior CAN and the D2B are transferred through the radio or the COMAND operating, display and control unit.

Data transfer between various bus systems
EIS control unit
Data are transferred between the engine compartment CAN and the interior CAN EIS control unit via the (N73) acting as the interface (gateway).
The EIS control unit (N73) also acts as the interface between the control units on the interior CAN and the cable to the data link connector for the STAR Diagnosis tool.

Steering column module
As of 01.07.02 the steering column module (N80) is also connected to CAN B and CAN-C, however, does not act as an interface (gateway) between the two bus systems.