Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method Center Airbag Sensor Assembly ECM Crash detection signal CAN Center Airbag Sensor Assembly Combination Meter Assembly SRS warning light ON demand signal Diagnosis signal (DTC) CAN Combination Meter Assembly Center Airbag Sensor Assembly Vehicle speed signal CAN ECM Center Airbag Sensor Assembly Engine speed signal Accelerator opening angle information Accelerator opening angle signal Shift position signal Test mode signal Stop signal CAN