System Diagram

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Airbag System Diagram (1 Of 2)

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Fig 2: Airbag System Diagram (2 Of 2)

TRANSMITTER SIGNAL CHART

Transmitting ECU (Transmitter)	Receiving ECU	Signals	Communication method
Center Airbag Sensor Assembly	ECM	Crash detection signal	BEAN
Center Airbag Sensor Assembly	Combination Meter Assembly	SRS warning light ON demand signal Passenger seat occupant detection signal Passenger seat buckle switch signal Diagnosis signal (DTC)
Combination Meter Assembly	Center Airbag Sensor Assembly	Vehicle speed signal Meter diagnosis polling signal
ECM	Center Airbag Sensor Assembly	Engine speed signal Accelerator opening angle information Accelerator opening angle signal Shift position signal Test mode signal Stop signal