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Lighting System: Initialization

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
  1. AFS ECU INITIALIZATION 
    NOTE: Steering neutral point automatic correction (AFS ECU INITIALIZATION) is necessary under the following condition.
    • Disconnecting the battery.
    • Replacing the steering sensor or AFS ECU.
    1. Run the vehicle on the place where few curve or traffic congestion exist at least 100 m at the speed between 20 km/h (12 mph) and 80 km/h (48 mph).

      HINT:

      • Steering neutral point correction begins automatically when turn the ignition switch on.
      • Steering neutral point correction is automatically performed by vehicle running. AFS operation is prohibited when steering neutral point automatic correction is not performed or during automatic correction.
      • AFS operation restarts when steering neutral point automatic correction is completed normally.
  2. AFS ECU RE-INITIALIZATION (WHEN NOT USING INTELLIGENT TESTER) 
    NOTE: This operation manually initializes the steering sensor when AFS operation is not normal due to abnormal automatic correction after completion of AFS INITIALIZATION.

    HINT:

    • If it is necessary to initialize the steering sensor when not disconnecting the battery, it is also possible to reset the signal from the steering sensor.
    • When the centering point memorized in the steering sensor differs from the normal point, the AFS ECU malfunctions. In the case, re-initialize it.
    • If the operation does not finishes within a specified time period, the system goes off the AFS indicator light and starts steering neutral point automatic correction.
  1. SHIFT TO INITIALIZATION 
    1. Engine is running and shift range is in the P position.
    2. Press the AFS OFF switch eight times at approximately one-second interval (once for ON and once more for OFF, i.e. 4 times ON and 4 times OFF).

      HINT:

      • The AFS OFF indicator light starts to blink twice per second.
      • Initialization can be started when the AFS OFF switch is either in the "ON" or "OFF" position.
      • When the AFS OFF switch is pressed eight times, it will return to its original state.

    NEXT 

  2. INITIALIZATION OF AFS ECU 
    1. Turn the steering wheel to adjust the tires so that they point straight ahead.
    2. Do not change the steering wheel position. Press the AFS OFF switch twice (once ON and once OFF).

      HINT:

      • The AFS OFF indicator light stays lit for two seconds.
      • When the AFS OFF switch is pressed twice, it will return to its original state.
    3. Do not change the steering wheel position and press the AFS OFF switch twice within 3 to 10 seconds.

      HINT:

      • The AFS OFF indicator light stays lit for two seconds.
      • When the AFS OFF switch is pressed twice, it will return to its original state.
    4. Do not change the steering wheel position and press the AFS OFF switch twice again within 3 to 10 seconds.

    NEXT 

  3. CHECK COMPLETION OF AFS ECU INITIALIZATION 
    1. When the initialization of the steering sensor signal is completed normally, the AFS OFF indicator light goes off, comes on, or blinks depending on the specific condition 3 second after the indicator light goes off.

      Result 

      RESULT

      Proceed to Result
      A Goes off: Initialization is started with the AFS OFF switch OFF (not pressed)
      Comes on: Initialization is started with the AFS OFF switch ON (pressed)
      B Blinks: Blinks twice per second

      HINT:

      • Failure to complete initialization. Proceed to step 2 within 10 seconds.
      • If 10 seconds elapse, the system starts steering neutral point automatic correction.

    B : GO TO STEP 2 

    A : END 

  4. AFS ECU RE-INITIALIZATION (WHEN USING INTELLIGENT TESTER) 
    NOTE: This operation manually initializes the steering sensor when AFS operation is not normal due to abnormal automatic correction after completion of AFS INITIALIZATION.

    HINT:

    • If it is necessary to initialize the steering sensor when not disconnecting the battery, it is also possible to reset the signal from the steering sensor.
    • When the centering point memorized in the steering sensor differs from the normal point, the AFS ECU malfunctions. In the case, re-initialize it.
    • If the operation does not finish within a specified time period, the system goes off the AFS indicator light and starts steering neutral point automatic correction.
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position and press the intelligent tester main switch ON.
    3. Select "STEER SENS INIT" on "DIAGNOSTICS MENU AFS" display.
    4. Turn the steering wheel with the engine starting until the tires face straight ahead, and press "ENTER".
    5. Check "CONFIRM" display and press "YES".
      NOTE: Do not turn the steering wheel while initializing and keep the tires facing straight ahead.
    6. Check the display for completion of the operation.

      HINT:

      If the operation above cannot be completed after several attempts, a malfunction in the steering sensor circuit is suspected.

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