Information Bus: Description and Operation

GF00.19-P-0001MCU Overall Network (GVN) Function







A1 Instrument cluster
A15p4 Tachometer (for code (V31) Cockpit clock and tachometer package)
B24/15 Yaw rate, lateral and longitudinal acceleration sensor
B32 Microwave sensor (for code (V01) Anti-theft alarm system (FFO))
B38 Rain sensor/light sensor (for code (V54) Rain/light sensor)
H3/2 Alarm signal siren with inclination sensor (for code (V01) Anti-theft alarm system (FFO))
N2/7 Restraint systems control unit
N3/10 ME-SFI [ME] control unit
N10/10 SAM control unit
N15/5 Electronic selector lever module control unit
N15/6 Automated manual transmission control unit
N23 Heater/air conditioning operating unit (for code (I01) Air conditioning Plus)
N47-5 ESP control unit
N49 Steering angle sensor
N68 Steering assist control unit (for code (V26) Power steering, EPS (FFO))
N88 TPM [RDK] control unit
N110 Weight Sensing System (WSS) control unit
X11/4 Data link connector
CAN Controller Area Network (data bus/CAN bus) (CAN)
CAN-B Controller area network bus class B (interior compartment) (CAN B)
LIN B Local Interconnect Network interior 1 (LIN B) (for code (V54) Rain/light sensor)
LIN C Local Interconnect Network interior 2 (LIN C) (for code (V01) Anti-theft alarm system (FFO))

Data bus systems
The following data bus systems are involved in the overall network:
^ Controller Area Network (data bus/CAN bus) (CAN)
^ Controller area network bus class B (interior compartment) (CAN B)
^ Local Interconnect Network (LIN)

CAN/CAN-B
When transferring data, the connected components are not addressed, but rather the content of a message (e.g. rpm or engine temperature) is marked by a unique identifier. With the subsequent acceptance filtering, all control units - upon correct reception of the message - use the identifier to determine whether the data are relevant for them or not.

The CAN operates at a transfer rate of 500 kbit/s, CAN-B at a transfer rate of 83.3 kbit/s. The instrument cluster functions as a gateway between CAN and CAN-B.

The following control units and components are networked over CAN:
^ Instrument cluster
^ SAM control unit
^ ESP control unit
^ Restraint systems control unit
^ Steering angle sensor
^ Yaw rate, lateral and longitudinal acceleration sensor
^ TPM [RDK] control unit
^ ME-SFI [ME] control unit
^ Heater/AC operating unit
^ Steering assist control unit
^ Automated manual transmission control unit
^ Electronic selector lever module control unit

The data link connector is the interface for connecting STAR DIAGNOSIS to CAN.

The following control units are networked over CAN-B:
^ Weight Sensing System (WSS) control unit
^ Instrument cluster

LIN
When data is transferred via LIN, digital signals are transmitted with an address.
The data transfer rate is 20 kbit/s.

The following components are connected to the SAM control unit via LIN B:
^ Rain sensor/light sensor
^ Tachograph

The following components are connected to the SAM control unit via LIN C:
^ Alarm siren with inclination sensor
^ Microwave sensor