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: Steering Lock System - System Diagram

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Input and output signals of each ECU

COMMUNICATION METHOD

Transmitting ECU	Receiving ECU	Signals	Communication Method
Main Body ECU	Steering Lock ECU	Power supply status (to steering lock motor)	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Sleep available status	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Lock / unlock sensor status	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Steering lock status	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Motor control status	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Diagnostic response status	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Lock / unlock sensor malfunction	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Power supply malfunction (to steering lock motor)	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Motor driver malfunction	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Lock bar (stuck) status	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Push button start function status	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Lock / unlock relay drive status	LIN
Steering Lock ECU	Certification ECU Main Body ECU ID Code Box	Hybrid control system start status	LIN