Unit | Description
Combination meter |

- Receives the seat belt buckle switch signal from the seat belt buckle switch and transmits it to BCM via CAN communication line.
- Receives a buzzer output signal from the BCM and sounds the buzzer.

BCM | Judges the seat belt warning condition according to the seat belt buckle switch signal received from the combination meter via CAN communication and transmits a buzzer output signal to the combination meter via CAN communication line if necessary.
Seat belt buckle switch (driver side) | Transmits the seat belt buckle switch signal to the combination meter.