STEERING LOCK SYSTEM Unable to Lock Steering Wheel

DESCRIPTION

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

When the steering lock is operating, the steering may not lock when the lock bar is not aligned with the lock hole of the steering column. In this case, the steering can be locked by turning the steering wheel a little in the same manner as is done for a vehicle with a mechanical key to change the position of the lock hole.

Related Data List and Active Test Items
Problem Symptom Data List Item Active Test Item
Unable to lock steering wheel

    Entry&Start

  • Lock Request Receive

  • S Code Check

  • L Code Check


    Main Body

  • FR Door Courtesy SW

  • FL Door Courtesy SW

 -

WIRING DIAGRAM

A01FDY6E01

INSPECTION PROCEDURE

Note


  • When using the GTS with the engine switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • 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.

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

  • 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.

  • 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).

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

PROCEDURE


  1. CHECK DTC (ALL)


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

      OK
      No DTCs are output.

      Note


      • When using the GTS with the engine switch off to troubleshoot:

        Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

      • 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

  2. READ VALUE USING GTS (LOCK REQUEST 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 Request Receive

      Reception state of steering lock 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 opening any door with engine switch off and shift lever in P

      NG: Except above

      		 If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
      OK
      The certification ECU (smart key ECU assembly) receives a lock request signal within 10 seconds of turning the engine switch from on (IG) to off and opening a door with the shift lever in P, and OK is displayed on the GTS screen.

    NG

    READ VALUE USING GTS (DOOR COURTESY) Click here

    OK

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


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

    2. Disconnect the steering lock ECU connector.

    3. A01FFVNE53
      Text in Illustration
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N24-1 (GND) - Body ground Always Below 1 Ω

    4. Reconnect the steering lock ECU connector.

    5. Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P.

    6. A01FIDUE07
      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 N24-3 (IGE) - N24-1 (GND)
      Tool Setting 2 V/DIV., 200 ms./DIV.
      Vehicle Condition Steering lock motor not operating → Steering lock motor operating → Steering lock motor 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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - 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 N24 steering lock ECU connector.

    3. Disconnect the N93 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
      N24-3 (IGE) - N93-29 (SLR+) Always Below 1 Ω
      N24-3 (IGE) - Body ground 10 kΩ or higher
      N93-29 (SLR+) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  5. READ VALUE USING GTS (DOOR COURTESY)


    1. Using the GTS, check the following main body ECU Data List item by opening and closing the driver door to confirm the state of the front door courtesy light switch assembly.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Door Courtesy SW Front door courtesy light switch assembly RH / ON or OFF

      OFF: Front door RH closed

      ON: Front door RH open

      		 If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or a related part.
      FL Door Courtesy SW Front door courtesy light switch assembly LH / ON or OFF

      OFF: Front door LH closed

      ON: Front door LH open

      		 If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or a related part.
      OK
      The Data List item changes in accordance with the opening and closing of the driver door.

    NG

    GO TO LIGHTING SYSTEM (DOOR COURTESY SWITCH CIRCUIT) Click here

    OK

  6. 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

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

  7. 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

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

    OK

  8. 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

  9. 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

  10. 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