2008 Lexus LS 460LFACTORY OEM SERVICE PROCEDURE

System Description

  1. DESCRIPTION 
    1. 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 
    MAIN COMPONENTS FUNCTION CHART

    Item Function
    Steering lock actuator Includes motor, lock bar and lock and unlock position sensors. Activated by steering lock ECU.
    Steering lock ECU Included in steering lock actuator. Activates steering lock motor based on permission signals from main body ECU and certification ECU.
    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 permit engine start after receiving unlock signal from steering lock ECU.
    Certification ECU Orders steering lock ECU to lock or unlock steering lock. Main body ECU and certification ECU permit engine start after receiving unlock signal from steering lock ECU.
    IG2 relay Controlled by main body ECU. Sends IG signals to steering lock ECU.
    ID code box Transmits command to set or cancel immobiliser to ECM based on permission signals from certification ECU.
  3. WARNING FUNCTION OF ENGINE SWITCH INDICATOR 
    1. The main body ECU blinks the LED indicator of the engine switch when any of the following problems occur in the system.
      Fig 1: Identifying Engine Switch Indicator
      G05851396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      INDICATOR BLINK PATTERN DETECTION ITEM REFERENCE

      Detection Item Indicator Blink Pattern Indication Status Countermeasure
      Steering lock release malfunction
      • Blinks 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 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] (See HOW TO PROCEED WITH TROUBLESHOOTING  )
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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