System Diagram

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Airbag System Diagram (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Airbag System Diagram (2 Of 2)

TRANSMITTING ECU, RECEIVING ECU AND COMMUNICATION METHOD CHART

Transmitting ECU (Transmitter)	Receiving ECU	Signals	Communication method
Center Airbag Sensor	ECM	Crash detection signal Fuel cut signal	CAN
Center Airbag Sensor	Main Body ECU	Driver seat buckle switch signal
Center Airbag Sensor	No 1 Meter ECU	SRS warning light ON demand signal SRS warning light blink demand signal Passenger seat occupant detection signal Passenger seat buckle switch signal Diagnosis signal (DTC)
No 1 Meter ECU	Center Airbag Sensor	Vehicle speed signal Meter diagnosis polling signal
ECM	Center Airbag Sensor	Engine speed signal Accelerator opening angle information Accelerator opening angle signal Shift position signal Test mode signal Stop signal
Center Airbag Sensor	Display and Navigations Multi-display2,3	Passenger occupant signal Passenger seat buckle switch signal
HINT. 1. w/ Navigation System (for HDD) 2: w/ Navigation System (for DVD) *3. w/o Navigation System