Overall network (GVN) function - GF00.19-P-0001GZ
MODEL 164 except CODE (494) California version except CODE (498) Japan version
Block diagram prior to production period 31.05.2006 shown
Block diagram as of production period 01.06.2006 shown
Block diagram prior to production period 31.05.2006 shown
Block diagram as of production period 01.06.2006 shown
Block diagram prior to production period 31.05.2006 shown
Block diagram as of production period 01.06.2006 shown
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) (CAN-A)
- Controller Area Network bus class B (interior)
- Controller Area Network bus class C (drive)
- Controller Area Network bus class D (diagnosis)
- Controller Area Network bus class H (vehicle dynamics)
- Local Interconnect Network bus
- Media Oriented System Transport (MOST)
The operational field is differentiated as follows:
- Communication between the rear displays and the DVD player takes place via CAN-A.
- 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 links the chassis system (ESP) and the distance control system (Distronic control 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. It is used between the multifunction steering wheel and the steering column module as well as in the air conditioning system. Likewise, it can be found between the upper control panel control unit and the lower control panel control unit as well as between the upper control panel control unit and the rotary light switch.
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.
It also represents the interface to the data link connector via the CAN-D in order to be able to check the control units that are connected to the different bus systems with 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 on the steering column module as well as all button operations on the multifunction steering wheel via the LIN bus and supplies them to the 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.
| CDI control unit component description | with engine 642 | GF07.16-P-6000GZ | |
| ME-SFI [ME] control unit, component description | with engine 113.964 | GF07.61-P-6000BK | |
| With engine 272.967, 273 | GF07.61-P-6000V | ||
| Intelligent servo module (ISM) component description | with TRANSMISSION 722.9 | GF27.19-P-4015GZ | |
| VGS control unit, component description | with TRANSMISSION 722.9 | GF27.19-P-4016GZ | |
| DTR controller unit, component description | with Distronic (DTR), code 219 | GF30.30-P-3210GZ | |
| AIRmatic with ADS control unit, component description | with Airmatic (air suspension with level adjustment and adaptive damping system ADS), code 489 | GF32.22-P-5108GZ | |
| Tire pressure monitor control unit, component description | with tire pressure monitor, code 475 | GF40.15-P-5124GZ | |
| Description of components in ESP control unit | GF42.45-P-5118GZ | ||
| Central gateway control unit, component description | GF54.21-P-4170GZ | ||
| Upper control panel control module component description | with Airmatic (air suspension with level adjustment and adaptive damping system ADS), code 489, except offroad package, code 430 | GF54.21-P-6040GZ | |
| with Airmatic (air suspension with level adjustment and adaptive damping system ADS), code 489, with offroad package, code 430 |
GF54.21-P-6040GZE | ||
| Steering column module component description | GF54.21-P-6050GZ | ||
| Lower control panel control unit, component description | Model 164.1 with Airmatic (air suspension with level adjustment and adaptive damping system ADS), code 489, with offroad package, code 430 | GF54.21-P-6060GZ | |
| Model 164.8 with offroad package, code 430 | GF54.21-P-6060GZA | ||
| Front SAM control unit, component description | GF54.21-P-7010GZ | ||
| Rear SAM control unit, component description | GF54.21-P-7030GZ | ||
| Instrument cluster, component description | GF54.30-P-6000GZ | ||
| Electronic compass component description | GF54.50-P-4102GZ | ||
| Parktronic system (PTS) control unit, component description | with Parktronic system (PTS), code 220 | GF54.65-P-5000GZ | |
| Left front door control unit, component description | GF72.29-P-4141GZ | ||
| Right front door control unit, component description | GF72.29-P-4142GZ | ||
| Rear-end door closing control unit, component description | with automatic rear-end door, code 890 | GF80.20-P-1003GZ | |
| Electronic ignition/starter switch control unit (EIS) component description | GF80.57-P-6000GZ | ||
| Keyless Go control unit, component description | with Keyless Go, code 889 | GF80.61-P-4200GZ | |
| Component description of headlamp range adjustment control unit | Bi-xenon headlamp unit with integrated curve illumination with code 615 | GF82.10-P-2112GZ | |
| Overhead control panel control unit, component description | GF82.20-P-5216GZ | ||
| TV tuner, component description | Model 164.1 with rear entertainment system, code 864 | GF82.60-P-3110GZ | |
| Model 164.8 with rear entertainment system | GF82.60-P-3110GZX | ||
| Audio 20, component description | with MB Audio 20 radio, code 523 | GF82.60-P-3121GZ | |
| Audio 50 APS component description | with MB Audio 50 APS radio, code 525 | GF82.61-P-4099GZ | |
| Sound amplifier, component description | with sound system, code 810 | GF82.62-P-3009GZ | |
| CD player with changer component description | with 6-disk CD changer, code 819 | GF82.64-P-3112GZ | |
| Component description for voice control system (VCS [SBS]) control unit | with voice control system (VCS [SBS]), code 813 | GF82.70-P-4300GZ | |
| Universal Portable CTEL Interface (UPCI [UHI]) control unit, component description | with preinstallation for telephone "Handy", UPCI system, code 386, with telephone "Handy", UPCI system, code 388 | GF82.70-P-5101GZ | |
| COMAND operating, display and controller unit, component description | with COMAND APS (with navigation), code 527 | GF82.85-P-3134GZ | |
| Rear entertainment DVD player component description | with rear entertainment system, code 864 | GF82.90-P-4009GZ | |
| Automatic air conditioning pushbutton control unit, component description | with automatic air conditioning, code 580 | GF83.40-P-3000GZE | |
| Comfort automatic air conditioning control and operating unit, component description | with comfort automatic air conditioning, code 581 | GF83.40-P-3010GZE | |
| Rear control panel control unit, component description | with automatic air conditioning, code 580 | GF83.40-P-3020GZ | |
| with comfort automatic air conditioning, code 581, | GF83.40-P-3020GZA | ||
| with rear audio system, code 519 | |||
| with comfort automatic air conditioning, code 581 | GF83.40-P-3020GZE | ||
| STH control unit, component description | with stationary heater, code 228 | GF83.70-P-4200GZ | |
| Component description of driver-side front seat adjustment control unit with memory | with memory package (driver seat, steering column, mirror), code 275 | GF91.29-P-5223GZ | |
| Component description of passenger-side front seat adjustment control unit with memory | With electrically adjustable front passenger seat with memory, code 242 | GF91.29-P-5224GZ | |
| Heated seats/seat ventilation control unit, component description | with front comfort seats, incl. seat heating and seat ventilation, code 401, with electrically heated left and right rear seats, code 872 | GF91.30-P-5209GZ | |
| Restraint systems control unit, component description | GF91.60-P-4048GZ | ||
| Reversible belt emergency tensioning retractor, component description | GF91.60-P-4050GZ |