STEERING LOCK SYSTEM Unable to Unlock Steering Wheel (Engine cannot Start)

DESCRIPTION

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

The steering may not unlock 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 be unlocked. If the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) or ECM is replaced, the system needs to be initialized. Otherwise, the steering cannot be unlocked and the engine cannot be started.

Related Data List and Active Test Items
Problem Symptom Data List Item Active Test Item
Unable to unlock steering wheel (Engine cannot start)

    Entry&Start

  • Unlock Request Receive

  • S Code Check

  • L Code Check

 -

WIRING DIAGRAM

A01BBUXE01

INSPECTION PROCEDURE

Note


  • When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry & Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • Perform either of the following operations to lock/unlock the steering:


    • To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG) with the shift lever in P.

    • To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.

  • The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.

  • After performing repairs, confirm that the problem does not occur.

  • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart Click here.

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

  • When replacing the steering lock ECU (steering lock actuator assembly), certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), registration must be performed (Refer to the Service Bulletin).

  • If the steering lock ECU (steering lock actuator assembly) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the engine. If the steering is locked for any reason, open and close a door with the engine switch off, and then unlock the steering by pressing the engine switch. This prevents the engine from starting while the steering is locked.

  • When starting the engine, make sure that the shift lever is in P and that the shift lever is not tilted.

PROCEDURE


  1. CHECK ENGINE SWITCH (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 engine switch with the brake pedal released causes the power source mode to change as follows:

        OK
        Off → on (ACC) → on (IG) → off
        Result
        Result Proceed to
        OK Smart warning light indicator type A
        Multi-information display type B
        NG C

    B

    CHECK INDICATOR Click here

    C

    GO TO SMART ENTRY AND START SYSTEM (FOR START FUNCTION) (PROBLEM SYMPTOMS TABLE) Click here

    A

  2. CHECK SMART WARNING LIGHT INDICATOR


    1. Turn the engine switch on (IG).

    2. Check that the smart warning light indicator on the combination meter assembly is rapidly blinking green.

      Result
      Result Proceed to
      Smart warning light indicator is blinking rapidly A
      Smart warning light indicator is not blinking rapidly B

    B

    CHECK DTC (ALL) Click here

    A

  3. CHECK STEERING UNLOCK


    1. While turning the steering wheel left and right, press the engine switch.

    2. Check that the steering is unlocked.

      OK
      The steering is unlocked.

    NG

    CHECK DTC (ALL) Click here

    OK

    END (STEERING LOCK SYSTEM IS NORMAL)

  4. CHECK INDICATOR


    1. With the engine switch on (IG), check that the smart warning light indicator on the combination meter assembly is rapidly blinking green and "STEERING LOCK ACTIVE" message is displayed on the multi-information display in the combination meter assembly.

      Result
      Result Proceed to
      Smart warning light indicator on the combination meter assembly is rapidly blinking green and "STEERING LOCK ACTIVE" message is displayed A
      Smart warning light indicator on the combination meter assembly is not rapidly blinking green and "STEERING LOCK ACTIVE" message is not displayed B

    NG

    CHECK DTC (ALL) Click here

    OK

  5. CHECK STEERING UNLOCK


    1. While turning the steering wheel left and right, press the engine switch.

    2. Check that the steering is unlocked.

      OK
      The steering is unlocked.

    NG

    CHECK DTC (ALL) Click here

    OK

    END (STEERING LOCK SYSTEM IS NORMAL)

  6. CHECK DTC (ALL)


    1. Using the GTS, confirm the output of DTCs for all systems.

      OK
      No DTCs are output.

      CAUTION:


      • When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry & Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

      • Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart.


    NG

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    OK

  7. READ VALUE USING GTS (UNLOCK REQUEST RECEIVE)


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

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Unlock Request Receive

      Reception state of steering unlock request signal by certification ECU (smart key ECU assembly) and sent to ID code box (immobiliser code ECU) / OK or NG

      Tech Tips


      • The reception state is maintained for 10 seconds.

      • When 10 seconds or more elapse after receiving the signal, the item changes to "NG".

      OK: Within 10 seconds of turning engine switch on (IG) or on (ACC) or starting engine

      NG: Except above

      • If the unlock signal has not been received, the engine cannot be started.

      • If this item does not change to "OK" even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
      OK
      Within 10 seconds of turning the engine switch on (ACC) or on (IG) or starting the engine, the Data List item changes to "OK".

    NG

    Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. Disconnect the H80 steering lock ECU (steering lock actuator assembly) connector.

    2. A01BF9EE78
      Text in Illustration
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H80-1 (GND) - Body ground Always Below 1 Ω

      Note

      If the result is not as specified, check for looseness in the connection which leads to ground.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H80-7 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT STEERING LOCK ECU (MOTOR ACTIVATION COMMAND SIGNAL)


    1. Reconnect the H80 steering lock ECU (steering lock actuator assembly) connector.

    2. A01BHYKE21
      Text in Illustration
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))
      *b Steering lock motor not operating
      *c Steering lock motor operating

      Check the signal waveform according to the condition(s) in the table below.

      Standard Frequency
      Item Content
      Tester Connection H80-3 (IGE) - H80-1 (GND)
      Tool Setting 2 V/DIV., 200 ms./DIV.
      Vehicle Condition Steering lock motor not operating → Operating → Not operating

      Tech Tips


      • When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.

      • In order to take measurements when the lock motor is operating, perform either of the following operations:


        • To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG) with the shift lever in P.

        • To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.


    NG

    Click here

    OK

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

  10. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    2. Disconnect the H80 steering lock ECU (steering lock actuator assembly) connector.

    3. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

    4. Check for deformation and corrosion of the connector case and terminals.

      OK
      There is no deformation or corrosion of the connector case or terminals.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H80-3 (IGE) - B75-17 (SLR+) Always Below 1 Ω
      H80-3 (IGE) - Body ground 10 kΩ or higher
      B75-17 (SLR+) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the H80 steering lock ECU (steering lock actuator assembly) connector.

    2. A01BCU1E49
      Text in Illustration
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H80-3 (IGE) - Body ground Always 11 to 14 V

    NG

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

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  12. READ VALUE USING GTS (S CODE CHECK)


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

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      S Code Check Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) / OK or NG

      OK: Verification result normal

      NG: Verification result abnormal

      When NG is displayed:


      • The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.

      • The steering cannot be locked.

      • The steering cannot be unlocked (the engine cannot be started).
      OK
      OK is displayed on the GTS.

      Tech Tips

      Reasons for verification failure:


      • The certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.

      • There is a problem with the communication between ECUs.

      • An ECU is replaced, but is not registered.

      • An ECU is replaced with an ECU which has a code already stored in it.


    NG

    Click here

    OK

  13. READ VALUE USING GTS (L CODE CHECK)


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

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      L Code Check Verification result between ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator assembly) / OK or NG

      OK: Verification result normal

      NG: Verification result abnormal

      When NG is displayed:


      • The ID code for the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator assembly) is not registered or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator assembly) is malfunctioning.

      • The steering cannot be locked.

      • The steering cannot be unlocked (the engine cannot be started).
      OK
      OK is displayed on the GTS.

      Tech Tips

      Reasons for verification failure:


      • The steering lock ECU (steering lock actuator assembly) or ID code box (immobiliser code ECU) is malfunctioning.

      • There is a problem with the communication between ECUs.

      • An ECU is replaced, but is not registered.

      • An ECU is replaced with an ECU which has a code already stored in it.


    NG

    Click here

    OK

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


    1. Replace the steering lock ECU (steering lock actuator assembly) with a new one Click here.

    2. Perform registration procedures (Refer to the Service Bulletin).

    3. Turn the engine switch on (IG).

    4. Turn the steering wheel and check the steering condition.

      OK
      Steering is unlocked.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) WAS DEFECTIVE)

  15. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly) with a new one (Refer to the Service Bulletin).

    2. Perform registration procedures (Refer to the Service Bulletin).

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

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      S Code Check Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) / OK or NG

      OK: Verification result normal

      NG: Verification result abnormal

      When NG is displayed:


      • The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.

      • The steering cannot be locked.

      • The steering cannot be unlocked (the engine cannot be started).
      OK
      OK is displayed on the GTS.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

    END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)

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


    1. Replace the steering lock ECU (steering lock actuator assembly) with a new one Click here.

    2. Perform registration procedures (Refer to the Service Bulletin).

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

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      L Code Check Verification result between ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator assembly) / OK or NG

      OK: Verification result normal

      NG: Verification result abnormal

      When a malfunction is present:


      • The ID code for the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator assembly) is not registered or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator assembly) is malfunctioning.

      • The steering cannot be locked.

      • The steering cannot be unlocked (the engine cannot be started).
      OK
      OK is displayed on the GTS.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

    END (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) WAS DEFECTIVE)