MODEL   215 as of 1.9.03

P00.19-3217-09

A1 Instrument cluster A76 Left front reversible emergency tensioning retractor A76/1 Right front reversible emergency tensioning retractor B29 DTR radar sensor N3/9 CDI control unit (model 220) N3/10 ME-SFI [ME] control unit

N15/3 ETC control unit N15/5 Electronic selector lever module control unit N47-5 ESP, SPS [PML] and BAS control unit N51 AIRmatic with ADS control unit (model 220) N51/2 ABC control unit N63/1 DTR control unit

N71 Headlamp range adjustment control unit N73 EIS [EZS] control unit N80 Steering column module N93 Central gateway control unit Y3/8n4 Fully integrated transmission control (VGS) control unit

P00.19-3216-09

A1 Instrument cluster A6/1 STH remote control receiver A37 PSE control unit (combined) N2/7 Restraint systems control unit N10/6 Left front SAM control unit N10/7 Right front SAM control unit N10/8 Rear SAM control unit N22/6 Rear control unit (model 215) N25/6 Rear seats control unit N26/8 PAS control unit (model 220) N28/1 Trailer recognition control unit

N32/1 Left front seat adjustment control unit with memory N32/2 Right front seat adjustment control unit with memory N62 PTS control unit N69/1 Left door control unit (model 215) N69/1 Left front door control unit (model 220) N69/2 Right door control unit (model 215) N69/2 Right front door control unit (model 220)

N69/3 Left rear door control unit (model 220) N69/4 Right rear door control unit (model 220) N69/5 Keyless go control unit N70 Overhead control panel control unit N72/1 Upper control panel control unit N73 EIS [EZS] control unit N80 Steering column module N88 TPM [RDK] control unit N93 Central gateway control unit N93/1 Audio gateway control unit N99 DC/DC converter control unit

Shown except code (498) Japan W Wake-up line A2/6 CD player with changer (in trunk) A2/10 TV tuner (MOST) A2/13 Sound amplifier A34/4 Cell phone interface A35/11 Voice recognition system control unit A40/3 COMAND operating, display and control unit N41/1 Navigation processor N93/1 Audio gateway control unit N112 Telecommunications control unit
		P00.19-3219-06

Shown with code (498) Japan W Wake-up line A2/6 CD player with changer (in trunk) A2/13 Sound amplifier A35/1 Hands-free system control unit A40/3 COMAND operating, display and control unit N93/1 Audio gateway control unit N112 E-call control unit
		P00.19-3218-06

Extended vehicle network The further development of driver information systems as well as the spread of driver-supported systems (e.g. Distronic, 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. In automotive engineering, the Controller Area Network (databus/CAN bus) (CAN) means that data are exchanged between almost all control units of a motor vehicle via a databus. Function Most control units are interlinked over databus lines. Control commands or messages are coded and introduced into the databus message or address orientated, with the individual control units having different priorities (access rights). The 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 some cases, various received messages are also combined in a control unit to form a new message. The new message is then also available to other control units on the databus 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) Media Oriented System Transport (MOST)

The fields of application differ as given below: CAN-B networks the control units for the convenience functions and lighting equipment in the vehicle (e.g. power windows, heated rear window, external and interior lights). CAN-C networks the control units for the drive and chassis systems (e.g. engine, transmission control). MOST uses a fiber optical cable to network the control units for the audio and navigation systems (e.g. telephone, voice control). In respect of the interference immunity, e.g., compared with electromagnetic effect or radiation, and the high data transfer rate, higher requirements are placed on the CAN-C. 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.

Data transfer between the bus systems The following control units form the interface between the bus systems: The central gateway control unit (N93) connects the CAN-B and the CAN-C. The audio gateway control unit (N93/1) connects the CAN-B and the MOST. Steering column module (N80), instrument cluster (A1) and EIS control unit (N73) Although the steering column module (N80), the instrument cluster (A1) and the EIS control unit (N73) are connected both to the CAN-B as well as to the CAN-C and exchange data with both bus systems, they do not act as an interface (gateway).