System Diagram [09/2014 - ]

Fig 1: Steering Lock System Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CIRCUIT DESCRIPTION

Component	Outline
Steering Lock ECU (Steering Lock Actuator Assembly)	The steering is locked and unlocked by communicating with the certification ECU (smart key ECU assembly) via LIN communication. When the following conditions are met, the steering can be unlocked. The codes (L codes) of the ID code box (immobilizer code ECU) and steering lock match. The codes (S codes) of the ID code box (immobilizer code ECU) and certification ECU (smart key ECU assembly) match. The certification ECU (smart key ECU assembly) and key ID codes match.
Certification ECU (Smart Key ECU Assembly)	The ID code of the key the user is carrying is sent to the electrical key antenna. The certification ECU (smart key ECU assembly) compares the key ID code it receives from the electrical key antenna with its own ID code. If they match, the certification ECU (smart key ECU assembly) permits the steering lock ECU to turn the power source mode on (READY), start the hybrid control system and unlock and lock the steering.
Power Management Control ECU	Permits the steering lock ECU to supply power to activate the motor. The power management control ECU and certification ECU (smart key ECU assembly) permit hybrid control system start after receiving an unlock signal from the steering lock ECU.
ID Code Box (Immobilizer Code ECU)	Receives immobilizer set and unset commands from the certification ECU (smart key ECU assembly) via LIN communication and sends them to the ECM.