System Diagram

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Supplemental Restraint System - System Diagram (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Supplemental Restraint System - System Diagram (2 Of 2)

COMMUNICATION METHOD

Transmitting ECU (Transmitter)	Receiving ECU	Signal	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 Passenger seat buckle switch signal Passenger seat occupant detection signal Diagnosis signal (DTC)	CAN - BEAN
Combination Meter Assembly	Center Airbag Sensor Assembly	Vehicle speed signal	BEAN - 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