2012 Toyota Matrix Base, Automatic TransFACTORY OEM SERVICE PROCEDURE

System Description

WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. DESCRIPTION 
    1. The steering lock system locks or unlocks the steering by activating the steering lock actuator assembly. The steering lock ECU activates the motor that is built into the actuator assembly based on signals from the certification ECU and main body ECU.
    2. A LIN (Local Interconnect Network) is used for communication between different ECUs in this system.
  2. FUNCTION OF COMPONENTS 
    1. 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 main body ECU and certification ECU.
      Detects steering lock or unlock state and transmits this 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/unlock the steering. 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. This ECU sends IG signals to the steering lock ECU.
      ID code box Transmits command to set or cancel immobilizer to ECM based on permission signals from certification ECU.
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.