Unit | Description
Combination meter | Receives a buzzer output signal from the BCM and sounds the buzzer.
BCM | Judges the light warning conditions from the signals provided by various switches and transmits a buzzer output signal to the combination meter via CAN communication line if necessary.
Combination switch (Lighting switch) | Transmits the position light request signal to BCM.
Door switch (driver side) | Transmits the door switch signal (driver side) to BCM.