STEERING LOCK SYSTEM Unable to Unlock Steering Wheel

DESCRIPTION

The power management control ECU supplies the power to activate the motor of the steering lock actuator assembly.

The steering lock actuator activates the steering lock motor and moves the lock bar into the steering column to lock the steering wheel.

The steering lock may not release when the lock bar gets stuck in the lock hole of the steering column. In this case, if an engine start operation is performed while shaking the steering wheel in the same manner as is done for a vehicle with a mechanical key, the lock bar will release.

The diagnosis information of the steering lock ECU (steering lock actuator assembly) is transmitted to the intelligent tester via the certification ECU (smart key ECU assembly) as the steering lock ECU (steering lock actuator assembly) is not connected to the CAN communication system.

WIRING DIAGRAM

A01NF7SE05

INSPECTION PROCEDURE

Note


  • If the steering lock ECU (steering lock actuator assembly) is replaced, with the power switch off and the shift lever to P, open and close the driver side door to record the current lock position into the steering lock ECU (steering lock actuator assembly). If this is not performed, the engine may not start.

  • After replacing the steering lock ECU (steering lock actuator assembly), ID code box (immobiliser Code ECU) or certification ECU (smart key ECU assembly), registration must be performed refer to the Service Bulletin for the registration method.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

When the power switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:

With the power switch off, open the driver door. Then (with the power switch still off) open and close any door several times at 1.5 second intervals.

PROCEDURE


  1. CHECK SWITCH CONDITION


    1. Check the power source mode change.


      1. When the key is inside the vehicle and the shift lever is in P, check that pressing the power switch causes the power source mode to change as follows:

        OK
        off → on (ACC) → on (IG) → off

        Tech Tips

        Do not depress the brake pedal.


    NG

    GO TO ENTRY AND START SYSTEM (FOR START FUNCTION) Click here

    OK

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


    1. Use the Data List to check if the steering lock command is functioning properly.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic 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

      		 -
      OK
      The certification ECU (smart key ECU assembly) receives an unlock request signal within 10 seconds of starting the engine, and "Yes" is displayed on the intelligent tester screen.

    NG

    READ VALUE USING INTELLIGENT TESTER (S CODE) Click here

    OK

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


    1. A01NF9ZE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Steering Lock ECU)

      Disconnect the F37 steering lock ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F37-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      F37-7 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NDLDE05
      Text in Illustration
      *1

      Component with harness connected

      (Steering Lock ECU)

      Move the shift lever to P.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F37-3 (IGE) - F37-1 (GND) Steering lock motor operating immediately after turning the power switch from off to on (IG) Below 1 V
      F37-3 (IGE) - F37-1 (GND) Steering lock motor not operating 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  5. READ VALUE USING INTELLIGENT TESTER (S CODE)


    1. Use the Data List to check if the S code certification is functioning properly.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      S Code Check

      S code certification result/

      NG or OK

      NG: S code certification result abnormal

      OK: S code certification result normal

      		 -
      OK
      "OK" is displayed on the intelligent tester.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU) Click here

    OK

  6. READ VALUE USING INTELLIGENT TESTER (L CODE)


    1. Use the Data List to check if the L code certification is functioning properly.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      L Code Check

      L code certification result/

      NG or OK

      NG: L code certification result abnormal

      OK: L code certification result normal

      		 -
      OK
      "OK" is displayed on the intelligent tester.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU) Click here

    OK

  7. REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)


    1. Replace the steering lock ECU (steering lock actuator assembly) Click here.


    NEXT

  8. CHECK STEERING LOCK RELEASED BY USUAL IGNITION


    1. Turn the power switch on (IG).

    2. Operate the steering wheel and check the steering lock condition.

      OK
      Steering lock is released.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (STEERING LOCK ECU WAS DEFECTIVE)

  9. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU).


    NEXT

  10. READ VALUE USING INTELLIGENT TESTER (S CODE)


    1. Use the Data List to check if the S code certification is functioning properly.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      S Code Check

      S code certification result/

      NG or OK

      NG: S code certification result abnormal

      OK: S code certification result normal

      		 -
      OK
      "OK" is displayed on the intelligent tester.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (ID CODE BOX WAS DEFECTIVE)

  11. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU).


    NEXT

  12. READ VALUE USING INTELLIGENT TESTER (L CODE)


    1. Use the Data List to check if the L code certification is functioning properly.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      L Code Check

      L code certification result/

      NG or OK

      NG: L code certification result abnormal

      OK: L code certification result normal

      		 -
      OK
      "OK" is displayed on the intelligent tester.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (ID CODE BOX WAS DEFECTIVE)