STEERING LOCK SYSTEM Steering Lock Motor Drive Power Circuit

DESCRIPTION

The steering lock actuator assembly (steering lock ECU) is connected to the power management control ECU*1 (power source control ECU*2) and certification ECU. The steering lock ECU cannot activate the motor unless it receives permission signals from both ECUs. (The power management control ECU*1 or power source control ECU*2 permits the steering lock ECU to supply power to activate the motor.)


WIRING DIAGRAM

A0118UTE02

INSPECTION PROCEDURE

Tech Tips

When the engine switch is off, the power management control ECU*1 or power source control ECU*2 may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following step to wake up the ECU.

Connect the intelligent tester to the DLC3 with the engine switch off, and turn any door courtesy switch ON and OFF at 1.5-second intervals until communication between the intelligent tester and the vehicle begins.


PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Check the problem symptom of the steering lock system.

      Result
      Condition Proceed to
      Steering lock cannot be released A
      Steering cannot be locked B

    B

    INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (LOCK/UNLOCK RECEIVE)


    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the tester on.

    5. Enter the following menus: Body / Entry and Start / Data List.

    6. Select the item below in the Data List, and read its value displayed on the intelligent tester.

      Entry and Start
      Tester Display Measurement Item/Range Normal Condition Diagnosis Note
      Lock/Unlock Receive Steering lock command reception record / YES or NO

      YES: Steering lock/unlock signal received

      NO: Steering lock/unlock signal not received

      		 -

    7. Check if a steering unlock command signal has been received.

      OK
      "YES" is displayed on the tester display.

    NG

    CHECK ENTRY AND START SYSTEM Click here

    OK

  3. INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

    A0117BGE01
    Text in Illustration
    *1

    Component with harness connected:

    (Steering Lock Actuator Assembly (Steering Lock ECU))

    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D33-3 (IGE) - D33-1 (GND)

      1. Engine switch off

      2. Engine switch on (ACC or IG)

      • Motor activated: Below 1 V

      • Motor not activated:

        11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND) Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND)


    1. A011B9LE01
      Text in Illustration
      *1

      Front view of wire harness connector:

      (to Steering Lock Actuator Assembly (Steering Lock ECU))

      Disconnect the connector from the steering lock actuator assembly (steering lock ECU).

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D33-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT (SOURCE) CONTROL ECU)


    1. A01196IE01
      Text in Illustration
      *1

      Rear view of wire harness connector:

      (to Power Management Control ECU)
      *2

      Front view of wire harness connector:

      (to Steering Lock Actuator Assembly (Steering Lock ECU))

      for 1KR-FE, 1NR-FE


      1. Disconnect the connector from the power management control ECU.

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        D33-3 (IGE) - D38-8 (SLR+) Always Below 1 Ω
        D33-3 (IGE) - Body ground Always 10 kΩ or higher
    2. A01196IE03
      Text in Illustration
      *1

      Rear view of wire harness connector:

      (to Power source Control ECU)
      *2

      Front view of wire harness connector:

      (to Steering Lock Actuator Assembly (Steering Lock ECU))

      for 1ND-TV


      1. Disconnect the connector from the power source control ECU.

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        D33-3 (IGE) - D73-8 (SLR+) Always Below 1 Ω
        D33-3 (IGE) - Body ground Always 10 kΩ or higher
        Result
        Result Proceed to
        NG A
        OK (for 1KR-FE, 1NR-FE) B
        OK (for 1ND-TV) C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE POWER SOURCE CONTROL ECU Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

    A0117BGE01
    Text in Illustration
    *1

    Component with harness connected:

    (Steering Lock Actuator Assembly (Steering Lock ECU))

    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D33-3 (IGE) - D33-1 (GND)

      The specified condition should be checked after performing the following:


      1. Move the shift lever to P

      2. Turn the engine switch off

      3. Open the driver door

      • Motor activated: Below 1 V

      • Motor not activated:

        11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT (SOURCE) CONTROL ECU) Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  7. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT (SOURCE) CONTROL ECU)


    1. A01196IE01
      Text in Illustration
      *1

      Rear view of wire harness connector:

      (to Power Management Control ECU)
      *2

      Front view of wire harness connector:

      (to Steering Lock Actuator Assembly (Steering Lock ECU))

      for 1KR-FE, 1NR-FE


      1. Disconnect the connector from the power management control ECU.

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        D33-3 (IGE) - D38-8 (SLR+) Always Below 1 Ω
        D33-3 (IGE) - Body ground Always 10 kΩ or higher
    2. A01196IE03
      Text in Illustration
      *1

      Rear view of wire harness connector:

      (to Power source Control ECU)
      *2

      Front view of wire harness connector:

      (to Steering Lock Actuator Assembly (Steering Lock ECU))

      for 1ND-TV


      1. Disconnect the connector from the power source control ECU.

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        D33-3 (IGE) - D73-8 (SLR+) Always Below 1 Ω
        D33-3 (IGE) - Body ground Always 10 kΩ or higher
        Result
        Result Proceed to
        NG A
        OK (for 1KR-FE, 1NR-FE) B
        OK (for 1ND-TV) C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE POWER SOURCE CONTROL ECU Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR