System Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: System Diagram - Airbag System (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: System Diagram - Airbag System (2 Of 2)

SIGNALS COMMUNICATION METHOD DESCRIPTION

Transmitting ECU (Transmitter)	Receiving ECU	Signals	Communication method
Center Airbag Sensor Assembly	ECM	Crash detection signal Driver seat buckle switch signal	CAN
Center Airbag Sensor Assembly	Seat Belt Control ECU	Driver seat buckle switch signal Passenger seat buckle switch signal Buckle switch malfunction signal	CAN
Center Airbag Sensor Assembly	Main Body ECU	Driver seat buckle switch signal	CAN - BEAN
Center Airbag Sensor Assembly	Combination Meter Assembly	SRS warning light ON demand signal Driver seat buckle switch signal Diagnosis signal (DTC)	CAN - BEAN
Combination Meter Assembly	Center Airbag Sensor Assembly	Vehicle speed signal	BEAN - CAN
ECM	Center Airbag Sensor Assembly	E/G speed signal Accelerator opening angle information Accelerator opening angle signal Shift position signal Test mode signal Stop signal	CAN