Local Interconnect Network (LIN)

GENERAL INFORMATION

LIN refers to "Local Interconnect Network," which is a serial multiplex communication protocol* administrated by LIN consortium. A communication circuit employing the LIN protocol connects each ECU, and switch and sensor data can be shared among ECUs, which enables more reduction in wiring.
NOTE:
*: The regulations that have been decided in detail, from software matters such as the necessary transmission rate for communication, the system, data format, and communication timing control method to hardware matters such as the harness type and length and the resistance values.

STRUCTURE





Master and slave ECUs are connected to the LIN bus lines. The master ECU is the ETACS*1-ECU, and the slave ECUs are the column switch (column-ECU), the power window main switch, the sunroof-ECU*2 and the lighting control sensor*3, the theft-alarm siren (via LIN cutoff control unit*4)*5 and the theft-alarm siren*5. The master ECU requests these slave ECUs to communicate each other via communication lines.
NOTE:

- *1: ETACS (Electronic Time and Alarm Control System)
- *2: Vehicles with sunroof
- *3: Vehicles with auto light function
- *4: The LIN cutoff control unit is a relay circuit to turn ON/OFF the LIN communication of theft-alarm siren. An ECU is not incorporated in the LIN cutoff control unit.
- *5: Vehicles with theft-alarm sensor