Steering Lock System (Diagnostics - Introduction): Other Toyota RAV4 IV

PRECAUTION

1. PRECAUTIONS WHEN WORKING ON ELECTRIC STEERING LOCK After replacing the steering lock actuator assembly (steering lock ECU), confirm the lock/unlock operation of the steering lock. OPERATION CONFIRMATION Lock With the engine switch off, open and close any door. Unlock Turn the engine switch from off to on (ACC) or on (IG). After replacing the steering lock actuator assembly (steering lock ECU), perform key ID code registration. If the steering lock actuator assembly (steering lock ECU) is replaced, open and close the driver door. The engine may not start until the driver door is opened and closed. HINT: Opening and closing the driver door causes the steering lock actuator assembly (steering lock ECU) to memorize the correct steering lock bar position. When the main body ECU is in sleep mode, it cannot communicate with the Techstream. Therefore, checking for DTCs of the smart key system or checking the Data List with the engine switch off cannot be performed. To exit sleep mode, perform the following steps: 1) open the driver door with the engine switch off, and 2) open and close any door several times at 1.5 second intervals.

Scheme 45

Scheme 46

INPUT AND OUTPUT SIGNALS OF EACH ECU

Scheme 47

1. DESCRIPTION The steering lock system locks and unlocks the steering lock by activating the steering lock bar with a motor. The steering lock ECU activates the motor based on permission signals from the certification ECU and main body ECU.
2. FUNCTIONS OF COMPONENTS Item Function Steering lock actuator assembly Includes a motor, lock bar, and lock and unlock position sensors. Activated by the steering lock ECU. Steering lock ECU Included in the steering lock actuator assembly. Activates the steering lock motor based on permission signals from the main body ECU and certification ECU. Detects steering lock and unlock positions and transmits the status to other ECUs. Main body ECU Permits the steering lock ECU to supply power to activate the motor. The main body ECU and certification ECU permit engine start after receiving an unlock signal from the steering lock ECU. Certification ECU Orders the steering lock ECU to lock or unlock the steering lock. The main body ECU and certification ECU permit engine start after receiving an unlock signal from the steering lock ECU. IG2 relay Controlled by the main body ECU. Sends IG signals to the steering lock ECU. ID code box Transmits a command to the ECM to set or cancel the immobiliser based on permission signals from the certification ECU.
3. WARNING FUNCTION OF ENGINE SWITCH INDICATOR The main body ECU blinks the LED indicator light of the engine switch when any of the following problems occurs in the system. Detection Item Indicator Light Blinking Pattern Indication Status Countermeasure Steering lock release malfunction Blinks in green at 1-second intervals Goes off 15 seconds after blinking starts Motor operates to release steering lock, but steering lock cannot be released (e.g. 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 Short in devices for activating motor Problem in steering lock ECU or main body ECU Troubleshoot by following "How to Proceed with Troubleshooting".Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-493498-S13295259062012081000000)