Toyota 4Runner: System Diagram

Toyota 4Runner Service Manual / Steering / Steering Column / Steering Lock System / System Diagram

SYSTEM DIAGRAM

Input and Output Signal of Each ECU

Transmitting ECU (Transmitter)	Receiving ECU (Receiver)	Signal	Communication Method
Power management control ECU	Steering lock actuator assembly (steering lock ECU)	Power supply status (to steering lock motor)	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Sleep available status	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Lock/unlock sensor status	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Steering lock status	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Motor control status	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Diagnostic response status	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Lock/unlock sensor malfunction	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Power supply malfunction (to steering lock motor)	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Motor driver malfunction	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Lock bar (stuck) status	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Push start status	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Lock/unlock relay drive status	LIN
Steering lock actuator assembly (steering lock ECU)	Certification ECU Power management control ECU ID code box	Engine start control status	LIN
Certification ECU	Steering lock actuator assembly (steering lock ECU)	Lock/unlock request	LIN
Main body ECU	Certification ECU Power management control ECU	Driver side door courtesy switch signal	CAN

System Description

SYSTEM DESCRIPTION 1. DESCRIPTION (a) The steering lock system locks or unlocks the steering by activating the steering lock bar with a motor. The steering lock ECU activates the motor based on ...

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use the following procedures to troubleshoot the steering lock system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT ...

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Components
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Terminals Of Ecu
TERMINALS OF ECU 1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (a) Disconnect the F42 air conditioning amplifier connector. (b) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) ...