ENTRY AND START SYSTEM(for Start Function) 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

B000WV2E06

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. 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.

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
      NG

    NG

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

    OK

  2. 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 4 Click here

    A

  3. 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

  4. CHECK FOR DTC


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


      Body Electrical > Entry&Start > Trouble Codes
      Body Electrical > Power Source Control > Trouble Codes
      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

  5. READ VALUE USING GTS (UNLOCK REQUEST RECEIVE)


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


      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 engine switch being turned 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 being 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.

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

  6. READ VALUE USING GTS (S CODE CHECK)


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


      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 engine cannot be started).

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

  7. READ VALUE USING GTS (L CODE CHECK)


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


      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 engine cannot be started).

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

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


    1. B000WAFC36
      *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
      P14-1 (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
      P14-7 (B) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

    2. B000U1RC98
      *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 P14-3 (IGE) - P14-1 (GND)
      Tool Setting 2 V/DIV., 200 ms./DIV.
      Condition

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


      • Shift state park (P)

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

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

      Pulse generation

      (See waveform)

      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).

        • To lock the steering, turn the engine 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

    NG

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


    1. Disconnect the P14 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. Disconnect the P66 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
      P14-3 (IGE) - P66-25 (SLR+) Always Below 1 Ω
      P14-3 (IGE) or P66-25 (SLR+) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. 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. Reconnect the P66 certification ECU (smart key ECU assembly) connector.

    3. B000YVLC49
      *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
      P14-3 (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) Click here

  12. 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.

      Click here

    2. Turn the engine switch on (IG).

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


      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 engine cannot be started).

      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. 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 Service Bulletin.

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


      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 engine cannot be started).

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


    1. B000YVLC50
      *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
      P14-4 (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

  15. 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.


      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 engine cannot be started).

      Body Electrical > Entry&Start > Data List
      Tester Display
      Steering Unlock
      OK
      Set is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  16. READ VALUE USING GTS (UNLOCK REQUEST RECEIVE)


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

      Tech Tips

      Refer to Service Bulletin.

    2. Perform registration.

      Tech Tips

      Refer to Service Bulletin.

    3. Turn the engine switch on (IG).

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


      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 engine switch being turned 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 being 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.

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

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


    1. Disconnect the P14 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. Disconnect the P66 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
      P14-4 (SLP1) - P66-14 (SLP) Always Below 1 Ω
      P14-4 (SLP1) or P66-14 (SLP) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. READ VALUE USING GTS (UNLOCK REQUEST RECEIVE)


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

      Click here

    2. Perform registration.

      Tech Tips

      Refer to Service Bulletin.

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


      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 engine switch being turned 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 being 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.

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