Overall network (GVN) function - GF00.19-P-0001GZA
MODEL 164.8 with CODE (494) USA version
Representation of CAN C
Representation of CAN-B bus before the production period 31.05.2006
Representation of CAN-B bus as of the production period 01.06.2006
Representation of MOST bus before the production period 31.05.2006
Representation of MOST bus as of the production period 01.06.2006
Overall network
The further development of driver information systems as well as the spread of video-based, driver-supporting systems (backup camera, ambient sensor technology), are reflected in the requirements placed 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)
- Controller Area Network bus class B (interior CAN)
- Controller Area Network bus class C (drive train CAN)
- Controller Area Network bus class D (diagnostic CAN)
- Controller Area Network bus class H (vehicle dynamics CAN)
- Local Interconnect Network bus
- Media Oriented System Transport bus
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. Moreover, the emergency call system control unit can be addressed over this CAN bus.
- CAN-H links the ESP control unit (N47-5), the DTR controller unit and the Turn rate, lateral and longitudinal acceleration sensor (B24/15).
- Via an optical fiber optic cable the MOST links the control units of the audio and navigation systems (e.g telephone, voice control system etc.).
- 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.
Area of use 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 the lower control panel control unit
- between the upper control panel control unit and the rotary light switch
- between the TPM [RDK] control unit (N88) 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 control units connected to the different bus systems with STAR DIAGNOSIS. Moreover, the emergency call system control unit is actuated via the CAN B bus.
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 conditions on 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.
| ME-SFI [ME] control unit, component description | GF07.61-P-6000V | ||
| Intelligent servo module (ISM) component description | GF27.19-P-4015GZ | ||
| VGS control unit, component description | GF27.19-P-4016GZ | ||
| Transfer case control unit, component description | with code 430 Offroad package | GF28.19-P-3200GZ | |
| DTR controller unit, component description | with code 219 Distronic (DTR) | GF30.30-P-3210GZ | |
| AIRmatic with ADS control unit, component description | with code 489 Airmatic (air suspension with level adjustment and adaptive damping system ADS) | GF32.22-P-5108GZ | |
| Airmatic control unit with component description | with code 489 Airmatic (air suspension with level adjustment without adaptive damping system ADS) | GF32.22-P-5109GZU | |
| Tire pressure monitor control unit, component description | with code 470 Tire pressure monitor (base) | GF40.15-P-5124GZ | |
| Description of components in ESP control unit | GF42.45-P-5118GZ | ||
| Yaw rate and lateral acceleration sensor, component description | GF42.45-P-5120GZ | ||
| Central gateway control unit, component description | GF54.21-P-4170GZ | ||
| Upper control panel control module component description | with code 489 Airmatic (air suspension with level adjustment and adaptive damping system ADS), except code 430 Offroad package | GF54.21-P-6040GZ | |
| with code 489 Airmatic (air suspension with level adjustment without adaptive damping system ADS) | GF54.21-P-6040GZA | ||
| with code 489 Airmatic (air suspension with level adjustment and adaptive damping system ADS), with code 430 Offroad package | GF54.21-P-6040GZU | ||
| Steering column module component description | GF54.21-P-6050GZ | ||
| Lower control panel control unit, component description | with code 430 Offroad package | 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 code 220 Parktronic system (PTS) | 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 code 890 Automatic rear-end door | GF80.20-P-1003GZ | |
| Electronic ignition/starter switch control unit (EIS) component description | GF80.57-P-6000GZ | ||
| Keyless Go control unit, component description | with code 889 Keyless Go | GF80.61-P-4200GZ | |
| Component description of headlamp range adjustment control unit | with code 615 Bi-xenon headlamp unit with integrated curve illumination | GF82.10-P-2112GZ | |
| Overhead control panel control unit, component description | GF82.20-P-5216GZ | ||
| Component description for voice control system (VCS [SBS]) control unit | with code 813 Voice control system (VCS [SBS]) | GF82.70-P-4300GZ | |
| Sound amplifier, component description | with CODE 810 Sound system | GF82.62-P-3009GZ | |
| CD player with changer component description | with code 819 6-disk CD changer | GF82.64-P-3112GZ | |
| Satellite radio, component description | with code 528 HIGH Class USA, with code 530 COMAND APS USA (with navigation system) | GF82.85-P-3105GZU | |
| COMAND operating, display and controller unit, component description | with code 528 HIGH Class USA, with code 530 COMAND APS USA (with navigation system) | GF82.85-P-3134GZU | |
| Rear entertainment DVD player component description | with code 864 Rear entertainment system | GF82.90-P-4009GZ | |
| Emergency call system control unit, component description | with code 359 TELE AID emergency call system | GF82.95-P-3212GZU | |
| Automatic air conditioning pushbutton control unit, component description | with code 580 Automatic air conditioning | GF83.40-P-3000GZU | |
| Comfort automatic air conditioning control and operating unit, component description | with code 581 Comfort automatic air conditioning, with code 582 Rear air conditioner |
GF83.40-P-3010RTU | |
| Rear control panel control unit, component description | with code 580 Automatic air conditioning | GF83.40-P-3020GZ | |
| with code 581 Comfort automatic air conditioning, with code 519 Rear audio system |
GF83.40-P-3020GZK | ||
| with code 581 Comfort automatic air conditioning | GF83.40-P-3020GZU | ||
| Component description of driver-side front seat adjustment control unit with memory | with code 275 Memory package (driver seat, steering column, mirrors) | GF91.29-P-5223GZ | |
| Component description of passenger-side front seat adjustment control unit with memory | with code 242 Electrically adjustable front passenger seat with memory | GF91.29-P-5224GZ | |
| Heated seats/seat ventilation control unit, component description | with code 401 Front comfort seats, incl. seat heating and seat ventilation and code 872 Electrically heated left and right rear seats | GF91.30-P-5209GZ | |
| WSS (Weight Sensing System) control unit, component description | GF91.60-P-4046GZ | ||
| Restraint systems control unit, component description | GF91.60-P-4048GZ | ||
| Reversible belt emergency tensioning retractor, component description | GF91.60-P-4050GZ |