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ENTRY AND START SYSTEM(for Start Function) Unable to Unlock Steering Wheel (Hybrid Control System cannot Start)

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DTC Code DTC Name
  Unable to Unlock Steering Wheel (Hybrid Control System cannot Start)
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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 power 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 hybrid vehicle control ECU assembly is replaced, the system needs to be initialized. Otherwise, the steering cannot be unlocked and the hybrid control system cannot be started.

Table 1. Related Data List and Active Test Items
Problem Symptom Data List Item and Active Test Item
Unable to unlock steering wheel (Hybrid control system cannot start)
  • Entry&Start

  • Unlock Request Receive

  • S Code Check

  • L Code Check

  • Steering Unlock
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the power 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. 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.

  • The entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • 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.

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PROCEDURE


  1. Click here

    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
      NG

    • OKClick here
    • NG

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

  2. Click here

    CHECK INDICATOR


    1. With the power switch on (IG), check that push power 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 power switch while turning steering wheel in either direction is displayed. A
      Push power switch while turning steering wheel in either direction is not displayed. B

  3. Click here

    CHECK STEERING UNLOCK


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

    2. Check that the steering is unlocked.

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

  4. Click here

    CHECK FOR DTC


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


      1. Body Electrical > Entry&Start > Trouble Codes



      1. Body Electrical > Power Source Control > Trouble Codes


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

  5. Click here

    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.


      1. Body Electrical > Entry&Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Unlock Request Receive Status of steering unlock command from certification ECU (smart key ECU assembly) OK or NG

        OK: Unlock request signal received within 10 seconds of power switch being turned on (IG) or on (ACC) or of a hybrid control system start operation being performed

        NG: Power switch not turned on (IG) or on (ACC) and hybrid control system start operation not being performed

        • The hybrid control system 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.



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        Unlock Request Receive




      OK
      Within 10 seconds of turning the power switch on (ACC) or on (IG) or starting the hybrid control system, the Data List item changes to "OK".
      Result
      Proceed to
      OK
      NG

  6. Click here

    READ VALUE USING GTS (S CODE CHECK)


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


      1. Body Electrical > Entry&Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        S Code Check S code verification result 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 hybrid control system cannot be started).



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        S Code Check




      OK
      "OK" is displayed on the GTS.
      Tip:

      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

  7. Click here

    READ VALUE USING GTS (L CODE CHECK)


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


      1. Body Electrical > Entry&Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        L Code Check L code verification result 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 hybrid control system cannot be started).



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        L Code Check




      OK
      "OK" is displayed on the GTS.
      Tip:

      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

  8. Click here

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


    1. Disconnect the G22 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
      G22-1 (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 Switch Condition Specified Condition
      G22-7 (B) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. Click here

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


    1. B004WM1C06
      *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

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

    2. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Tool Setting Condition Specified Condition
      G22-3 (IGE) - G22-1 (GND) 2 V/DIV., 200 ms./DIV.

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


      • Shift state park (P)

      • Steering lock unlocked in advance by carrying key and turning power switch on (IG)

      • After above conditions met, power switch turned off

      Pulse generation

      (See waveform)
      Tip:

      • 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 power switch on (ACC) or on (IG).

        • To lock the steering, turn the power switch off with the shift state park (P), and then open a door.

      Result
      Proceed to
      OK
      NG

    • OK

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

    • NGClick here
  10. Click here

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


    1. Disconnect the G22 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. Disconnect the G71 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
      G22-3 (IGE) - G71-25 (SLR+) Always Below 1 Ω
      G22-3 (IGE) or G71-25 (SLR+) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. Click here

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


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

    2. B004W83C20
      *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 Switch Condition Specified Condition
      G22-3 (IGE) - Body ground Power switch off 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)Click here

  12. Click here

    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.

      Tip:

      • For replacement.

        Click here

      • Refer to Service Bulletin.

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


      1. Body Electrical > Entry&Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        L Code Check L code verification result 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 hybrid control system cannot be started).



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        L Code Check




      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)

  13. Click here

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


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

      Tip:

      Refer to Service Bulletin.

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


      1. Body Electrical > Entry&Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        S Code Check S code verification result 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 hybrid control system cannot be started).



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        S Code Check




      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)

  14. Click here

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


    1. B004W83C21
      *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 Switch Condition Specified Condition
      G22-4 (SLP1) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

  15. Click here

    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.


      1. Body Electrical > Entry&Start > Data List
        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 hybrid control system cannot be started).



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        Steering Unlock




      OK
      "Set" is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

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

  16. Click here

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


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

      Tip:

      Refer to Service Bulletin.

    2. Perform registration.

      Tip:

      Refer to Service Bulletin.

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


      1. Body Electrical > Entry&Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Unlock Request Receive Status of steering unlock command from certification ECU (smart key ECU assembly) OK or NG

        OK: Unlock request signal received within 10 seconds of power switch being turned on (IG) or on (ACC) or of a hybrid control system start operation being performed

        NG: Power switch not turned on (IG) or on (ACC) and hybrid control system start operation not being performed

        • The hybrid control system 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.



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        Unlock Request Receive




      OK
      Within 10 seconds of turning the power switch on (ACC) or on (IG) or starting the hybrid control system, 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)

  17. Click here

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


    1. Disconnect the G22 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. Disconnect the G71 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
      G22-4 (SLP1) - G71-14 (SLP) Always Below 1 Ω
      G22-4 (SLP1) or G71-14 (SLP) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  18. Click here

    CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)


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

      Click here

    2. Perform registration.

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


      1. Body Electrical > Entry&Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Unlock Request Receive Status of steering unlock command from certification ECU (smart key ECU assembly) OK or NG

        OK: Unlock request signal received within 10 seconds of power switch being turned on (IG) or on (ACC) or of a hybrid control system start operation being performed

        NG: Power switch not turned on (IG) or on (ACC) and hybrid control system start operation not being performed

        • The hybrid control system 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.



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        Unlock Request Receive




      OK
      Within 10 seconds of turning the power switch on (ACC) or on (IG) or starting the hybrid control system, 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)