MULTIPLEX COMMUNICATION SYSTEM

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Outline

•  A control area network (CAN) system has been adopted in which the multiple control modules send/receive signals using two common communication lines.
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•  Local CAN, ISO communication, or LIN communication has been adopted for the individual communication between control modules in consideration of the communication speed and the cost.

System Wiring Diagram

Note
•  The following figure shows the CAN/LIN communication/ISO communication/local CAN connection conditions. The availability of the equipment may differ depending on the vehicle specifications.

CAN communication

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Local CAN

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LIN communication

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ISO communication

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Structural View

Note
•  The following figure shows the installation positions for the equipment which perform CAN communication. The availability of the equipment may differ depending on the vehicle specifications.
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Function


CAN (controller area network) system

•  CAN BUS No.1 is used for communication between the following modules:
―  BCM
―  EPS control module
―  Auto leveling control module/adaptive LED headlights control module
―  SAS control module
―  Electronically controlled brake unit
―  Parking lock actuator
―  Selector lever
―  TCM
―  PCM
•  CAN BUS No.2 is used for communication between the following modules:
―  BCM
―  Integrated starter generator (ISG)
―  Mazda M Hybrid battery
―  DC-DC converter (Mazda M Hybrid)
―  Electronically controlled brake unit
―  Parking lock actuator
―  Selector lever
―  PCM
•  CAN BUS No.3 is used for communication between the following modules:
―  BCM
―  Front combination light (LH)
―  Front combination light (RH)
―  Climate control unit
―  Active driving display
―  Steering lock unit
―  Steering angle sensor
―  Instrument cluster
―  Door-electrical supply unit (driver's side)
―  Door-electrical supply unit (passenger's side)
―  LF control unit
―  Dash-electrical supply unit
―  Electrical supply unit (ESU)
•  CAN BUS No.4 is used for communication between the following modules:
―  BCM
―  Rear side radar sensor (RH)
―  Parking assist unit (ultrasonic)
―  Electrical supply unit (ESU)
•  CAN BUS No.5 is used for communication between the following modules:
―  BCM
―  Parking assist unit (optical)/360° view monitor control module
―  Driver monitoring camera unit
―  Forward sensing camera (FSC)
•  CAN BUS No.6 is used for communication between the following modules:
―  BCM
―  Front side radar sensor (LH)
―  Front radar sensor
•  CAN BUS No.7 is used for communication between the following modules:
―  BCM
―  Audio amplifier
―  Connectivity master unit (CMU)


Local CAN

•  Local CAN is used for communication between the following modules:
―  Between PCM and TCM
―  Between front side radar sensor (LH) and front side radar sensor (RH)
―  Between rear side radar sensor (LH) and rear side radar sensor (RH)


LIN communication

•  LIN communication is used for communication between the following modules:
―  Between BCM and electrical supply unit (ESU)
―  Between BCM and humidity sensor/solar radiation sensor/auto light sensor/rain sensor
―  Between BCM and indicator unit
―  Between BCM and front map light
―  Between BCM and windshield wiper motor
―  Between dash-electrical supply unit and air mix actuator
―  Between dash-electrical supply unit and airflow mode actuator
―  Between dash-electrical supply unit and air intake actuator
―  Between dash-electrical supply unit and position memory control module/ seat warmer control unit
―  Between dash-electrical supply unit and heated steering wheel control unit
―  Between PCM and engine oil level sensor
―  Between instrument cluster and cluster switch
―  Between adaptive LED headlights control module and headlight leveling actuator (LH/RH)


ISO communication

•  ISO communication is used for communication between the following modules:
―  Between BCM and LF control unit


Construction


CAN

•  The CAN BUS No.1 has terminal resistors built into the following units which form the CAN lines.
―  BCM
―  PCM
•  The CAN BUS No.2 has terminal resistors built into the following units which form the CAN lines.
―  BCM
―  PCM
•  The CAN BUS No.3 has terminator resistors built into the following units which form the CAN lines.
―  BCM
―  Electrical supply unit (ESU)
•  The CAN BUS No.4 has terminal resistors built into the following units which form the CAN lines.
―  BCM
―  Electrical supply unit (ESU)
•  The CAN BUS No.5 has terminal resistors built into the following units which form the CAN lines.
―  BCM
―  Forward sensing camera (FSC)
•  The CAN BUS No.6 has terminal resistors built into the following units which form the CAN lines.
―  BCM
•  The CAN BUS No.7 has terminal resistors built into the following units which form the CAN lines.
―  BCM
―  Connectivity master unit (CMU)


Local CAN

•  The local CAN has terminator resistors built into the following units which form the CAN lines.
―  PCM
―  TCM
―  Front side radar sensor (LH)
―  Front side radar sensor (RH)
―  Rear side radar sensor (LH)
―  Rear side radar sensor (RH)


LIN communication

•  The LIN communication has drivers built into the following units which form the LIN communication lines.
―  BCM
―  Electrical supply unit (ESU)
―  Humidity sensor/solar radiation sensor/auto light sensor/rain sensor
―  Windshield wiper motor
―  Indicator unit
―  Front map light
―  Dash-electrical supply unit
―  Driver-side air mix actuator
―  Airflow mode actuator
―  Air intake actuator
―  Heated steering wheel control unit
―  Position memory control module / Seat warmer control unit
―  Instrument cluster
―  Cluster switch
―  Engine oil level sensor
―  PCM
―  Active air shutter
―  Headlight leveling actuator (LH/RH)


ISO communication

•  The ISO communication has drivers built into the following units which form the ISO communication lines.
―  BCM
―  LF control unit