Overall network (GVN) function - GF00.19-P-0001FL

MODEL 212.0/2 up to model year 2014 

Overall network, general 

The requirements placed on vehicle electronics, e.g. in the following areas, increase continuously:

• Vehicle safety
• Comfort
• Communication
• Diagnosis

This requires networking of the existing systems in the vehicle so that the necessary information can be exchanged.

This cannot be achieved using conventional data transfer since the amount of installation space is limited and a reduction of the weight of the vehicle is targeted. This is why bus systems are used.

The vehicle electronics are networked using the following bus systems:

• CAN 
• Media Oriented System Transport (MOST) 

CAN 

The CAN is an electrical bus system for the transmission of data via two lines. The CAN consists of a twisted two-core data line that connects all CAN participants (control units) via a parallel connection. The two lines of the data line must not be swapped (low level/high level). Each connected control unit is able to transmit or receive data (bidirectional bus). The data are sent digitally over the CAN at various intervals. The individual data blocks are defined in a data protocol and it is specified which data are received or transmitted by a control unit. The sum of the data blocks, the short break between two transmission intervals and other properties of the CAN are checked constantly.

Detected faults are stored and placed in the fault memory.

The CAN offers the following advantages:

• Data exchange between individual control units
• Provision of sensor signals for multiple systems
• Reduction of the number of electrical lines
• Improvement of the electromagnetic compatibility

The following CANs are involved in the overall network:

• Telematics CAN (CAN A) 
• Interior CAN (CAN B) 
• Drive train CAN (CAN C) 
• Diagnostic CAN (CAN D) 
• Chassis CAN (CAN E) 
• Front end CAN (CAN G) 
• Vehicle dynamics CAN (CAN H) 
• Drive train sensor CAN (CAN I) 
• Hybrid CAN (CAN L) (model 212.095/098/298) 
• Sensor CAN (CAN S) 

Telematics CAN 

The telematics CAN is used for the data exchange between the attached audio components.

The telematics CAN operates at a transfer rate of 125 kBit/s.

The following control units are participants on the telematics CAN:

• Radio (A2) (with CODE 523 (MB Audio 20 radio) or CODE 510 (Audio 20 with CD changer))
• Navigation module (A2/30) (with CODE 509 (Navigation box)) in holder for navigation module (A2/30-1) (with CODE 508 (Navigation box preinstallation) or CODE 509 (Navigation box))
• Radio with auto pilot system (A2/56) (with CODE 525 (MB Audio 50 APS radio) or CODE 511 (Audio 50 APS with DVD changer))
• COMAND controller unit (A40/3) (with CODE 512 (COMAND APS with DVD changer) or CODE 526 (COMAND with single DVD drive (without navigation)) or CODE 527 (COMAND APS with single DVD drive (with navigation)) or CODE 528 (COMAND incl. DVD changer))
• DVD player (A40/4) (with CODE 864 (Rear entertainment system))
• Left rear display (A40/5) (with CODE 864 (Rear entertainment system))
• Right rear display (A40/6) (with CODE 864 (Rear entertainment system))
• Audio/COMAND display (A40/8)
• Audio/COMAND control panel (A40/9)

Gateway:

The radio or the COMAND controller unit forms the interface for data exchange with control units that are connected to other bus systems.

Interior CAN 

The interior CAN is used for data exchange between the attached control units.

The interior CAN operates at a transfer rate of 125 kBit/s.

The following control units are participants on the interior CAN:

• Instrument cluster (A1)
• Stationary heater control unit (A6n1) (with CODE 228 (Stationary heater))
• Radio or COMAND controller unit
• Panoramic sliding sunroof control module (A98) (with CODE 413 (Panoramic glass sunroof with top sliding sunroof))
• Pneumatic pump for dynamic multicontour seat (M40/1) (with CODE 432 (Left and right dynamic multicontour seat))
• Front SAM control unit with fuse and relay module (N10/1)
• Rear SAM control unit with fuse and relay module (N10/2)
• AAC control and operating unit (N22/7)
• Rear seat heater control unit (N25/6) (with CODE 872 (Electrically heated left and right rear seats))
• Steering wheel heater control unit (N25/7) (with CODE 443 (Steering wheel heater))
• Multifunction control unit for special-purpose vehicle (N26/9) (with CODE 965 (Electrical preinstallation for rental vehicles))
• Trailer recognition control unit (N28/1) (with CODE 550 (Trailer hitch))
• Driver seat control unit (N32/1) (with CODE 275 (Memory package for electrically adjustable front seats))
• Front passenger seat control unit (N32/2) (with CODE 275 (Memory package for electrically adjustable front seats))
• Left front dynamic multicontour seat control unit (N32/19) (with CODE 432 (Left and right dynamic multicontour seat))
• Right front dynamic multicontour seat control unit (N32/22) (with CODE 432 (Left and right dynamic multicontour seat))
• Reversing camera control unit (N66/2) (with CODE 218 (Reversing camera) and CODE 498 (Japan version))
• Left front door control unit (N69/1)
• Right front door control unit (N69/2)
• Left rear door control unit (N69/3)
• Right rear door control unit (N69/4)
• KEYLESS-GO control unit (N69/5) (with CODE 889 (Keyless-Go))
• Overhead control panel control unit (N70) (with CODE 414 (Power glass tilting/sliding roof))
• Electronic ignition lock control unit (N73)
• Weight sensing system (WSS) control unit (N110) (with CODE U10 (Front passenger seat with weight sensing))
• Trunk lid control unit (N121) (model 212.0 with CODE 881 (Remote trunk closing (RTC [HDFS])))
• Liftgate control unit (N121/1) (model 212.2)

Gateway:

The following control units form the interface for data exchange between control units connected to other bus systems:

• Front SAM control unit
• Radio or COMAND controller unit

The electronic ignition lock control unit and the instrument cluster are also connected to the chassis CAN.

At the front SAM control unit, the upper control panel control unit (N72/1) is connected via the instrument panel LIN (LIN 1).

Drive train CAN 

The drive train CAN is used for data exchange between the attached control units.

The drive train CAN operates at a transfer rate of 500 kBit/s.

The following control units are participants on the drive train CAN:

• Intelligent servo module for DIRECT SELECT (A80) (transmission 722.9)
• CDI control unit (N3/9) (diesel engine)
• ME-SFI [ME] control unit (N3/10) (gasoline engine)
• Electronic transmission control unit (N15/3) (transmission 722.6)
• Electronic selector lever module control unit (N15/5) (transmission 722.6)
• Transmission oil auxiliary pump control unit (N89) (with CODE B03 (ECO start/stop function), except model 212.095/098/298)
• Fuel system control unit (N118)
• CNG control unit (N118/2) (engine 271.958 with CODE 924 (Bivalent natural gas drive))
• Transmission mode control unit (N145) (model 212.074/077/274/277)
• DIRECT SELECT INTERFACE (N150) (model 212.074/077/274/277)
• Fully integrated transmission control unit (Y3/8n4) (transmission 724, 722.9)

Gateway:

The CDI control unit or the ME-SFI [ME] control unit forms the interface for data exchange between control unit connected to other bus systems.

The transmission mode control unit is also connected to the chassis CAN.

Diagnostic CAN 

The diagnostic CAN is used for the data exchange of the external diagnostic tester with the control units in the vehicle.

The diagnostic CAN operates at a transfer rate of 500 kBit/s.

The following control units are participants on the diagnostic CAN:

• Front SAM control unit
• Emergency call system control unit (N123/4) (with CODE 348 (Emergency call/assist system) or CODE 359 (TELEAID emergency call system))

Gateway:

The front SAM control unit forms the interface for data exchange with control units that are connected to other bus systems.

Chassis CAN 

Chassis CAN is used for data exchange between the connected control units.

The chassis CAN operates at a transfer rate of 500 kBit/s.

The following control units are participants on the chassis CAN:

• Instrument cluster
• Multifunction camera (A40/11) (with CODE 238 (Active Lane Keeping Assist), CODE 476 (Lane Keeping Assist), CODE 513 (Speed Limit Assist) or CODE 608 (Adaptive Highbeam Assist))
• Left front reversible emergency tensioning retractor (A76)
• Right front reversible emergency tensioning retractor (A76/1)
• Supplemental Restraint System control unit (N2/10)
• CDI control unit or ME-SFI [ME] control unit
• Front SAM control unit
• Electronic Stability Program control unit (N30/4) (model 212 (except 212.074/077/095/098/274/277/298) except CODE 233 (DISTRONIC PLUS))
• Regenerative braking system control unit (N30/6) (model 212.095/098/298)
• Premium Electronic Stability Program control unit (N30/7) (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/077/274/277)
• AIRMATIC control unit (N51/3) (with CODE 488 (Steel/air suspension) or CODE 489 (AIRMATIC (air suspension with continuous adjustment damping)))
• Parking system control unit (N62) (with CODE 220 (PARKTRONIC) or CODE 230 (Exclusive Parking Assist))
• Radar sensors control unit (N62/1) (up to 31.05.2010 with CODE 233 (DISTRONIC PLUS) or CODE 234 (Blind Spot Assist))
• Video and radar sensor system control unit (N62/2) (as of 01.06.2010 with CODE 233 (DISTRONIC PLUS), CODE 237 (Active Blind Spot Assist) or CODE 238 (Active Lane Keeping Assist))
• Electronic ignition switch control unit
• Steering column tube module control unit (N80)
• Tire pressure monitor control unit (N88) (with CODE 475 (Tire pressure monitor (premium)))
• Rear axle electronic level control unit (N97) (model 212.2 except CODE 489 (AIRMATIC (air suspension with continuous adjustment damping)) and except CODE 488 (Steel/air suspension))
• Night View Assist control unit (N101) (with CODE 610 (Night View Assist))
• Transmission mode control unit (model 212.074/077/274/277)

Gateway:

The following control units form the interface for data exchange between control units connected to other bus systems:

• CDI control unit or ME-SFI [ME] control unit
• Front SAM control unit
• Radar sensors control unit or video and radar sensor system control unit
• Electronic Stability Program control unit or Regenerative braking system control unit

The electronic ignition lock control unit and the instrument cluster are also connected to the interior CAN.

The transmission mode control unit is also connected to the drive train CAN.

Front end CAN 

The front end CAN is used for data exchange between the attached control units.

The front end CAN operates at a transfer rate of 500 kBit/s.

The following control units are participants on the front end CAN:

• Front SAM control unit
• Left rear bumper intelligent radar sensor (B29/4) (with CODE 234 (Blind Spot Assist) as of 01.06.2010)
• Right rear bumper intelligent radar sensor (B29/5) (with CODE 234 (Blind Spot Assist) as of 01.06.2010)
• Left xenon light control unit (E1n1) (with CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) or CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) or CODE 621 (Intelligent Light System (left-hand traffic)) or CODE 622 (Intelligent Light System (right-hand traffic)))
• Right xenon light control unit (E2n1) (with CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) or CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) or CODE 621 (Intelligent Light System (left-hand traffic)) or CODE 622 (Intelligent Light System (right-hand traffic)))

Gateway:

The front SAM control unit forms the interface for data exchange with control units that are connected to other bus systems.

Vehicle dynamics CAN 

The vehicle dynamics CAN is used for data exchange between the attached control units.

The vehicle dynamics CAN operates at a transfer rate of 500 kBit/s.

The following control units are participants on the vehicle dynamics CAN:

• DISTRONIC electric controller unit (A89) (with CODE 233 (DISTRONIC PLUS) or CODE 237 (Active Blind Spot Assist))
• Yaw rate sensor for lateral and longitudinal acceleration (B24/15)
• Electronic Stability Program control unit (model 212 (except 212.074/077/095/098/274/277/298) except CODE 233 (DISTRONIC PLUS))
• Regenerative braking system control unit (model 212.095/098/298)
• Premium Electronic Stability Program control unit (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/077/274/277)
• Radar sensors control unit (up to 31.05.2010 with CODE 233 (DISTRONIC PLUS) or CODE 234 (Blind Spot Assist))
• Video and radar sensor system control unit (as of 01.06.2010 with CODE 233 (DISTRONIC PLUS), CODE 237 (Active Blind Spot Assist) or CODE 238 (Active Lane Keeping Assist))

Gateway:

The following control units form the interface for data exchange between control units connected to other bus systems:

• Electronic Stability Program control unit or Regenerative braking system control unit
• Radar sensors control unit or video and radar sensor system control unit

Drive train sensor CAN 

The drive train sensor CAN is used for data exchange between the attached control units.

The drive train sensor CAN operates at a transfer rate of 500 kBit/s.

The following control units are participants on the drive train sensor CAN:

• CDI control unit or ME-SFI [ME] control unit
• Left nitrogen oxides control unit (N37/5) (engine 276.9 with CODE 920 (Gasoline direct injection with stratified charge), engine 272.983)
• Right nitrogen oxides control unit (N37/6) (engine 276.9 with CODE 920 (Gasoline direct injection with stratified charge), engine 272.983)
• Nitrogen oxides control unit downstream of diesel particulate filter (N37/7) (engine 642.8 with CODE U42 (BLUETEC (SCR) diesel exhaust treatment))
• Nitrogen oxides control unit downstream of SCR catalytic converter (N37/8) (engine 642.8 with CODE U42 (BLUETEC (SCR) diesel exhaust treatment))
• AdBlue® control unit (N118/5) (engine 642 with CODE U42 (BlueTEC (SCR) diesel exhaust treatment))

Gateway:

The CDI control unit or the ME-SFI [ME] control unit forms the interface for data exchange between control unit connected to other bus systems.

Hybrid CAN (model 212.095/098/298) 

The hybrid CAN is used for data exchange between the connected control units.

The hybrid CAN operates at a transfer rate of 500 kBit/s.

The following control units are subscribers to the hybrid CAN:

• Electric refrigerant compressor (A9/5) (model 212.095/098/298)
• CDI control unit (model 212.098/298) or ME-SFI [ME] control unit (model 212.095)
• Battery management system control unit (N82/2) (model 212.095/098/298)
• Power electronics control unit (N129/1) (model 212.095/098/298)

Gateway:

The CDI control unit or the ME-SFI [ME] control unit forms the interface for data exchange between control unit connected to other bus systems.

Sensor CAN 

The sensor CAN is used for data exchange between the attached control units.

The sensor CAN operates with a transfer rate of 500 kBit/s.

The following control units are subscribers to the sensor CAN:

• Left front bumper DISTRONIC (DTR) sensor (B29/2) (with CODE 233 (DISTRONIC PLUS) or CODE 237 (Active Blind Spot Assist))
• Right front bumper DISTRONIC (DTR) sensor (B29/3) (with CODE 233 (DISTRONIC PLUS) or CODE 237 (Active Blind Spot Assist))
• Left rear bumper radar sensor (B29/6) (with CODE 234 (Blind Spot Assist) up to 31.05.2010 or CODE 237 (Active Blind Spot Assist))
• Right rear bumper radar sensor (B29/7) (with CODE 234 (Blind Spot Assist) up to 31.05.2010 or CODE 237 (Active Blind Spot Assist))
• Radar sensors control unit (up to 31.05.2010 with CODE 233 (DISTRONIC PLUS) or CODE 234 (Blind Spot Assist))
• Video and radar sensor system control unit (as of 01.06.2010 with CODE 233 (DISTRONIC PLUS), CODE 237 (Active Blind Spot Assist) or CODE 238 (Active Lane Keeping Assist))

Gateway:

The radar sensors control unit or the video and radar sensor system control unit forms the interface for data exchange between control units connected to other bus systems.

MOST 

The MOST is an optical bus system.

Here, data are transferred via fiber optic cable to the connected information, navigation, and communication components. The MOST operates with a transfer rate of 22 Mbits/s.

The following control units are participants on the MOST:

• Radio or COMAND controller unit
• TV tuner (analog/digital) (A90/1) (with CODE 863 (Digital/analog TV tuner))
• Digital TV tuner (A90/3) (with CODE 527 (COMAND APS with single DVD drive (with navigation)) and CODE 498 (Japan version) or CODE 865 (TV tuner))
• Sound system amplifier control unit (N40/3) (with CODE 810 (Sound system) or CODE 811 (Advanced sound system))
• Digital Audio Broadcasting control unit (N87/3) (with CODE 537 (Digital radio))
• Satellite Digital Audio Radio (SDAR) control unit (N87/5) (as of 01.06.2010 with CODE 536 (SIRIUS satellite radio))
• SDAR/high definition tuner control unit (N87/8) (up to 31.05.2010 with CODE 536 (SIRIUS satellite radio))
• Media interface control unit (N125/1) (with CODE 518 (Media interface))

Gateway:

The radio or the COMAND controller unit forms the interface for data exchange with control units that are connected to other bus systems.