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

DESCRIPTION

The steering lock ECU (steering lock actuator or upper bracket 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 the engine switch is turned on (IG) while shaking the steering wheel, 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 and Active Test
Unable to unlock steering wheel (Engine cannot start)

    Entry&Start

  • Unlock Request Receive

  • S Code Check

  • L Code Check

  • Steering Unlock

WIRING DIAGRAM

B001G7PE03

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 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 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.

  • After completing repairs, confirm that the problem does not recur.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

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

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

  • Before replacing the steering lock ECU (steering lock actuator or upper bracket assembly), certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), refer to the Service Bulletin.

PROCEDURE


  1. CHECK POWER SOURCE MODE CHANGING FUNCTION (SWITCH CONDITION)


    1. Check the power source mode change.

      Click here

      OK
      The power source mode changes to on (IG).
      Result
      Proceed to
      OK (w/ Multi-information Display (TFT Display Type))
      OK (w/ Multi-information Display (Segment Display Type))
      NG

    OK (w/ Multi-information Display (TFT Display Type))

    CHECK INDICATOR Click here

    NG

    GO TO ENTRY AND START SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG and ACC)) Click here

    OK (w/ Multi-information Display (Segment Display Type))

  2. CHECK INDICATOR


    1. With the engine switch on (IG), check that the entry warning light on the combination meter assembly is illuminated green.

      Result
      Result Proceed to
      Entry warning light illuminated green. A
      Entry warning light not illuminated green. B

    A

    GO TO STEP 4 Click here

    B

    GO TO STEP 5 Click here

  3. CHECK INDICATOR


    1. With the engine switch on (IG), check that push engine switch while turning steering wheel in either direction is displayed on the multi-information display in the combination meter assembly.

      Result
      Result Proceed to
      Push engine switch while turning steering wheel in either direction is displayed. A
      Push engine switch while turning steering wheel in either direction is not displayed. B

    B

    GO TO STEP 5 Click here

    A

  4. CHECK STEERING UNLOCK


    1. Turn the steering wheel left and right, and then press the engine switch.

    2. Check that the steering is unlocked.

      Result
      Result Proceed to
      The steering is unlocked. A
      The steering is not unlocked. B

    A

    END (STEERING LOCK IS NORMAL)

    B

  5. CHECK FOR DTC


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Check for DTCs and note any DTCs that are output.

      Click here

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B

    GO TO DIAGNOSTIC PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  6. READ VALUE USING GTS (UNLOCK REQUEST RECEIVE)


    1. Enter the following menus: Body Electrical / Entry&Start / Data List.

    2. Read the Data List according to the display on the GTS.

      Entry&Start
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Unlock Request Receive Unlock request signal received state OK or NG

      OK: Unlock request signal received within 10 seconds of engine switch on (IG) or on (ACC), or of an engine start operation being performed

      NG: Engine switch not turned on (IG) or on (ACC), and engine start operation not performed

      • The engine cannot be started when an unlock request signal cannot be received.

      • If OK is not displayed 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".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here

    OK

  7. READ VALUE USING GTS (S CODE CHECK)


    1. Read the Data List according to the display on the GTS.

      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.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

  8. READ VALUE USING GTS (L CODE CHECK)


    1. Read the Data List according to the display on the GTS.

      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 or upper bracket 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 or upper bracket assembly) is not registered, or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket 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 or upper bracket 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.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - POWER SUPPLY AND BODY GROUND)


    1. B001CFQC51
      *a

      Front view of wire harness connector

      (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

      Disconnect the steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G35-1 (GND) - Body ground Always Below 1 Ω

      Note

      If the result is not as specified, check for looseness in the ground cable connection.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G35-7 (B) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) (MOTOR ACTIVATION COMMAND SIGNAL)


    1. Reconnect the steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. B001EHJC05
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))
      *b Steering Lock Motor not Operating
      *c Steering Lock Motor Operating
      *d Waveform

      Using an oscilloscope, check the waveform.

      OK
      Item Content
      Tester Connection G35-3 (IGE) - G35-1 (GND)
      Tool Setting 2 V/DIV., 200 ms./DIV.
      Condition

      Any door opened when conditions below met, and then steering lock motor activated:


      • Shift lever in P*

      • Steering lock unlocked in advance by carrying electrical key transmitter sub-assembly and turning engine switch on (IG)

      • After above conditions met, engine switch turned off
      Specified Condition

      Pulse generation

      (See waveform)

      • *: for Automatic Transmission

      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 electrical key transmitter sub-assembly and turn the engine switch on (ACC) or on (IG).

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


          • *: for Automatic Transmission

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) for Power Tilt and Power Telescopic Steering Column: REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here
    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) for Manual Tilt and Manual Telescopic Steering Column: REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here

    NG

  11. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY))


    1. Disconnect the G35 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. Disconnect the G215 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G35-3 (IGE) - G215-24 (SLR+) Always Below 1 Ω
      G35-3 (IGE) or G215-24 (SLR+) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)


    1. B001D6NC72
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

      Reconnect the steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G35-3 (IGE) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) for Power Tilt and Power Telescopic Steering Column: REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here
    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) for Manual Tilt and Manual Telescopic Steering Column: REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here

  13. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)


    1. Replace the steering lock ECU (steering lock actuator or upper bracket assembly) with a new one.

      for Power Tilt and Power Telescopic Steering Column:

      Click here

      for Manual Tilt and Manual Telescopic Steering Column:

      Click here

    2. Perform registration.

      Tech Tips

      Refer to the Service Bulletin.

    3. Read the Data List according to the display on the GTS.

      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 or upper bracket 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 or upper bracket assembly) is not registered, or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket 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.
      Result
      Proceed to
      OK
      NG

    OK

    END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE)

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  14. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly) with a new one and perform registration again.

      Tech Tips

      Refer to the Service Bulletin.

    2. Perform registration.

      Tech Tips

      Refer to the Service Bulletin.

    3. Read the Data List according to the display on the GTS.

      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.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  15. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)


    1. B001D6NC73
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G35-4 (SLP1) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)) Click here

    OK

  16. READ VALUE USING GTS (STEERING UNLOCK)


    1. Check that the steering is locked.

    2. Read the Data List according to the display on the GTS.

      Entry&Start
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Steering Unlock Steering lock ECU (steering lock actuator or upper bracket assembly) unlock confirmation status Unset or Set

      Unset: Unlock not confirmed

      Set: Unlock confirmed

      		 When Unset is displayed, the steering is not unlocked (the engine cannot be started).
      OK
      "Set" is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) for Power Tilt and Power Telescopic Steering Column: REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here
    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) for Manual Tilt and Manual Telescopic Steering Column: REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here

    OK

  17. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly) with a new one.

      Tech Tips

      Refer to the Service Bulletin.

    2. Perform registration.

      Tech Tips

      Refer to the Service Bulletin.

    3. Read the Data List according to the display on the GTS.

      Entry&Start
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Unlock Request Receive Unlock request signal received state OK or NG

      OK: Unlock request signal received within 10 seconds of engine switch on (IG) or on (ACC), or of an engine start operation being performed

      NG: Engine switch not turned on (IG) or on (ACC), and engine start operation not performed

      • The engine cannot be started when an unlock request signal cannot be received.

      • If OK is not displayed 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".
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  18. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY))


    1. Disconnect the G35 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. Disconnect the G215 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G35-4 (SLP1) - G215-23 (SLP) Always Below 1 Ω
      G35-4 (SLP1) or G215-23 (SLP) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)


    1. Replace the steering lock ECU (steering lock actuator or upper bracket assembly) with a new one.

      for Power Tilt and Power Telescopic Steering Column:

      Click here

      for Manual Tilt and Manual Telescopic Steering Column:

      Click here

    2. Perform registration.

      Tech Tips

      Refer to the Service Bulletin.

    3. Read the Data List according to the display on the GTS.

      Entry&Start
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Unlock Request Receive Unlock request signal received state OK or NG

      OK: Unlock request signal received within 10 seconds of engine switch on (IG) or on (ACC), or of an engine start operation being performed

      NG: Engine switch not turned on (IG) or on (ACC), and engine start operation not performed

      • The engine cannot be started when an unlock request signal cannot be received.

      • If OK is not displayed 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".
      Result
      Proceed to
      OK
      NG

    OK

    END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)