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: Seat Belt Warning System Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Communication Table

COMMUNICATION CHART

Sender	Receiver	Signal	Line
Center airbag sensor assembly	Gateway ECU	Front seat inner belt switch signal (for driver side) Front seat inner belt switch signal (for passenger side) Occupant detection signal	CAN
Gateway ECU	Combination meter	Front seat inner belt switch signal (for driver side) Front seat inner belt switch signal (for passenger side) Occupant detection signal	BEAN