Extended vehicle network (GVN) function - GF00.19-P-0001QU
MODEL 209.3 /4 up to 31.5.04 with CODE (491) USA version
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 via the EIS control unit (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 datalink 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.
All the button operations on the multifunction steering wheel and switch operations on the steering column module (N80) are read in by this and placed on CAN B. The driving direction signals are recognized by the steering angle sensor and are placed on CAN C via the steering column module (N80, these signals are available to the ESP (Electronic Stability Program) and the air suspension and adaptive cruise control (ART)
Instrument cluster
Although the instrument cluster
(A1) is connected both to the interior CAN as well as to the engine compartment CAN and exchanges data with both systems, it does 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 interior CAN.
| E-CALL control unit, location/task/design | With code (349) E-call emergency call system | GF82.95-P-4200QU | |
| Telephone interface, location/task/design/function | with code (854) MB portable CTEL telephone | GF82.70-P-3107QU | |
| Voice control system control unit, location/task | GF82.70-P-4113Q | ||
| Sound amplifier, location/task/design/function | with code (810) Sound system | GF82.62-P-3100Q | |
| CD player with changer, location/task/design/function | With code (819a) CD changer | GF82.64-P-3113Q | |
| Radio control panel, location/task/design/function | With code (255) Audio 30 | GF82.60-P-3115QU | |
| Control and operating unit automatic air conditioning location/task | Model 209.3 with code (581a) Automatic air conditioning | GF83.40-P-2180Q | |
| Model 209.4 with code (581a) Automatic air conditioning | GF83.40-P-2180QA | ||
| Control and operating unit for comfort automatic air conditioning, location/purpose | Model 209.3 with code (581b) Comfort automatic air conditioning | GF83.40-P-2181Q | |
| Model 209.4 with code (581b) Comfort automatic air conditioning | GF83.40-P-2181QA | ||
| SAM control unit with front fuse and relay module, location / task / design | GF54.21-P-4108Q | ||
| Rear SAM control unit with fuse and relay module, location / task | Model 209.3 | GF54.21-P-4130Q | |
| Model 209.4 | GF54.21-P-4130QA | ||
| Left front seat adjustment control unit with memory location/task | With code (275c) driver seat, steering column and outside mirrors electrically adjustable with memory | GF91.29-P-2106Q | |
| Right front seat adjustment control unit with memory location/task | With code (242b) electrically adjustable front passenger seat with memory. | GF91.29-P-2107Q | |
| Left door control unit, location/task | GF72.29-P-4122Q | ||
| Right door control unit location/task | GF72.29-P-4123Q | ||
| Rear control unit location/task | Model 209.3 | GF54.21-P-4133Q | |
| Soft top actuation control unit, location/purpose/design/function | Model 209.4 | GF77.37-P-3200QA | |
| Overhead control panel control unit, location / task / design | Model 209.3 | GF82.20-P-4110Q | |
| Model 209.4 | GF82.20-P-4110QA | ||
| Upper control panel control unit, location / task / design / function | GF54.21-P-4105Q | ||
| Lower control panel control unit, location/task/design | Model 209.3 | GF54.21-P-4116Q | |
| PTS control unit, location / task | With code (220a) Parktronic system (PTS) | GF54.65-P-4100Q | |
| Trailer recognition control unit, location/task/design | with code (550) Trailer device | GF82.10-P-2106Q | |
| Supplemental restraint systems control unit, location/task/design | Model 209.3 | GF91.60-P-4018Q | |
| Model 209.4 | GF91.60-P-4018QA | ||
| Electronic ignition switch control unit, location/purpose | GF80.57-P-4120Q | ||
| Instrument cluster (IC) location/task | GF54.30-P-3039Q | ||
| Steering column module, location/task | GF54.21-P-4125Q | ||
| SEQ control unit, location/task/design | Transmission 716.6 with code (424) Sequentronic automated manual transmission (SEQ) | GF26.19-P-4009Q | |
| ETC control unit, location/task | Transmission 722.6 | GF27.19-P-4012G | |
| Electronic selector lever module control unit, location/task/design | Transmission 722.6 | GF27.19-P-5138P | |
| ME-SFI control unit, location/task/design/function | Engines 112.912/955, 113.968 | GF07.61-P-5000F | |
| Engine 271.940/942 | GF07.61-P-5000KE | ||
| Stationary heater/heater booster control unit, location/task | Models 209.3 with code (228) Stationary heater | GF83.70-P-4002A | |
| DTR control unit, location/task/design/function | Engines 112.912/955, 113.968, 271.940/942 with code (219a) Distronic (DTR) | GF30.30-P-3104K | |
| ESP control unit, location/task/function | With code (472a) Electronic Stability Program (ESP). | GF42.45-P-4500T |