Steering Lock System (Diagnostics - Introduction): Other Toyota 4Runner V

PRECAUTION

1. PRECAUTIONS WHEN WORKING ON ELECTRIC STEERING LOCK After replacing the steering lock actuator assembly (steering lock ECU), perform key ID code registration. After replacing the steering lock actuator assembly (steering lock ECU), confirm the lock/unlock operation of the steering lock. Operation Confirmation Steering Lock Condition Procedure Lock With the engine switch off, open and close any door. Unlock Turn the engine switch from off to on (ACC) or on (IG). If checking for DTCs of the smart key system or if checking the Data List with the engine switch off, make sure that the driver door is open. HINT: When using the Techstream with the engine switch off to troubleshoot, connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins. When a steering lock system DTC is output, confirm and record the DTCs before turning the engine switch off or clearing the DTCs, as past DTCs are not stored in the certification ECU.

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INPUT AND OUTPUT SIGNAL OF EACH ECU

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1. DESCRIPTION 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 signals from the certification ECU and power management control ECU. A Local Interconnect Network (LIN) is used for communication between different ECUs in this system.
2. FUNCTIONS OF COMPONENTS The steering lock ECU controls the system based on information from the following components: Item Function Steering lock actuator assembly Consists of a motor, lock bar, lock and unlock position sensors, etc. activated by the steering lock ECU. Steering lock ECU Included in the steering lock actuator assembly. This ECU activates the steering lock motor based on permission signals from the certification ECU. Records ECU verification codes. Power management control ECU Permits the steering lock ECU to supply power to activate the motor. Performs power supply switching control. Controls the engine switch indicator. Operates the IG2 relay. Certification ECU Performs key verification (checks whether the correct key is present). Controls the security indicator and the illumination of the lettering on the engine switch. Records ECU verification codes. IG2 relay Controlled by the power management control ECU. Signals indicating the on/off status of this relay are sent to the power management control ECU and steering lock ECU. ID code box Transmits a command to set or cancel the immobiliser to the ECM based on permission signals from the certification ECU. Records ECU verification codes.
3. WARNING FUNCTION OF ENGINE SWITCH INDICATOR TEXT IN ILLUSTRATION *1 Indicator Light The power management control ECU blinks the indicator light LED of the engine switch when any of the following problems occur in the system. Detection Item Indicator Blink Pattern Indication Status Countermeasure Steering lock release malfunction Blinks in green at 1-second intervals Goes off 30 seconds after blinking starts Motor operates to release steering lock, but steering lock cannot be released (lock bar stuck in steering column). Push engine switch while turning steering wheel to right and left Malfunction in push button start function Blinks in amber at 2-second intervals Goes off 15 seconds after blinking starts Short in devices for activating motor Problem in steering lock ECU or power management control ECU Troubleshoot by following "How to Proceed with Troubleshooting". Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-422208-S40537683192011092600000)