Steering Lock System (Diagnostics - Introduction): Other Lexus LX J200

PRECAUTION

1. PRECAUTIONS WHEN WORKING ON ELECTRIC STEERING LOCK After replacing the steering lock actuator assembly (steering lock ECU), perform the key ID code registration. If the steering lock actuator assembly (steering lock ECU) is replaced, open and close the driver's door. The engine may not start until the driver's door is opened or closed. HINT: Opening and closing the driver's 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 access system with push-button start and checking the Data List with the engine switch off cannot be performed. To exit sleep mode, perform the following steps: 1) open the driver's door with the engine switch off, 2) open and close any door several times at 1.5 second intervals.

Scheme 76

Scheme 77

INPUT AND OUTPUT SIGNALS OF EACH ECU

Scheme 78

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 (smart key ECU assembly) and main body ECU.
2. FUNCTIONS OF COMPONENTS Item Function Steering lock actuator assembly Includes motor, lock bar and lock and unlock position sensors. Activated by steering lock ECU. Steering lock ECU Included in steering lock actuator assembly. Activates steering lock motor based on permission signals from main body ECU and certification ECU (smart key ECU assembly). Detects steering lock and unlock positions and transmits status to other ECUs. Main body ECU Permits steering lock ECU to supply power to activate motor. Main body ECU and certification ECU (smart key ECU assembly) permit engine start after receiving unlock signal from steering lock ECU. Certification ECU (Smart key ECU assembly) Orders steering lock ECU to lock or unlock steering lock. Main body ECU and certification ECU (smart key ECU assembly) permit engine start after receiving unlock signal from steering lock ECU. Integration relay (IG2 relay) Controlled by main body ECU. Sends IG signals to steering lock ECU. ID code box (Immobiliser code ECU) Transmits command to set or cancel immobiliser to ECM based on permission signals from certification ECU (smart key ECU assembly).
3. WARNING FUNCTION OF ENGINE SWITCH INDICATOR The main body ECU blinks the LED indicator 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 (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 Goes off 15 seconds after blinking starts 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-385258-S37956517072011021400000)