LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2016 >> Prius C Four >> Repair and Diagnosis >> Steering >> Steering Column >> Steering Lock System - Diagnostics - Introduction >> Steering Lock System >> Data List / Active Test [11/2015 - ] >> Data List / Active Test [11/2015 - ]
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Data List / Active Test [11/2015 - ]

  1. READ DATA LIST 

    HINT: 

    Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

    NOTE:

    In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

    1. Turn the power switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Body Electrical / (desired system) / Data List.
    6. According to the display on the Techstream, read the Data List.
    7. Using the Techstream, confirm the Data List items to help determine the cause of the problem.
      NOTE:
      • The steering lock ECU communicates with the Techstream through the certification ECU (smart key ECU assembly) which uses CAN communication. If the CAN communication system or certification ECU (smart key ECU assembly) is malfunctioning, Data List items may not be normal.
      • When using the Techstream with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Data List.
      POWER SOURCE CONTROL

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Shift P Signal Shift position (P) signal / ON or OFF ON: Shift lever in P
      OFF: Shift lever not in P
      • Use this item to determine if the shift position switch is malfunctioning.
      • The hybrid control system cannot be started when this item is "OFF".
      Steering Unlock Switch State of steering unlock sensor signal output from steering lock actuator assembly / ON or OFF ON: Steering unlocked (Power switch on (ACC))
      OFF: Steering locked (Power switch off door opened)      		 This item can be used to determine the cause of problems when the steering does not lock or unlock.
      HINT: 
      • The steering is considered locked when the lock sensor is ON and the unlock sensor is OFF.
      • The steering is considered unlocked when the lock sensor is OFF and the unlock sensor is ON.
      Str Lock/Unlock Wait T-Out Steering lock or unlock malfunction / Yes or No Yes: Steering lock/unlock timed out (Lock bar stuck, etc.)
      No: Steering locks/unlocks normally within specified time      		 The hybrid control system cannot be started when this item is "Yes".
      SMART KEY

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Ignition Switch State of certification ECU (smart key ECU assembly) IG power supply input / ON or OFF ON: Power switch on (IG)
      OFF: Power switch off      		 This item displays "OFF" when the power switch is on (ACC).
      #Codes Number of DTCs / 0 to 255 Number of stored DTCs displayed -
      Immobiliser State of immobiliser system determined by certification ECU (smart key ECU assembly) / Set or Unset Set: Engine immobiliser set (Power switch off)
      Unset: Engine immobiliser unset (Power switch on (ACC) or on (IG))
      • When the immobiliser cannot be unset, this item can be used to determine whether the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is part of the problem.
      • The hybrid control system cannot be started when this item displays "Set".
      HINT: 
      • The state of the immobiliser (whether it is set or unset) can be determined through the certification ECU (smart key ECU assembly). If this item displays "Set", the communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) can be determined to be normal.
      • The security indicator light operation is only linked with the state of the immobiliser (set/unset), and is not related to the steering lock operation (lock/unlock), when the immobiliser is set, the security indicator light blinks.
      Steering Lock Sleep Cond Steering lock ECU sleep condition / Yes or No - -
      Steering Lock Start Cond Transmission state of steering lock ECU wake up signal / Yes or No Yes: Wake up signal transmitted
      No: Wake up signal not transmitted      		 -
      Engine Start Condition State of hybrid control system permission signal determined by steering lock ECU and sent to certification ECU (smart key ECU assembly) / OK or NG OK: Hybrid control system permitted
      NG: Hybrid control system prohibited
      • When this item displays "OK", the certification ECU (smart key ECU assembly) has received an unlock confirmation signal from the steering lock ECU and has permitted fuel injection and hybrid control system combustion.
      • The hybrid control system cannot be started when this item displays "NG".
      Sensor Value Record of malfunction of position sensor in steering lock actuator assembly / OK or NG(Past) OK: No record of lock/unlock sensor malfunction in steering lock actuator assembly
      NG(Past): Record of lock/unlock sensor in steering lock actuator assembly turning ON at same time exists      		 When this item displays "NG", the sensor inside the steering lock actuator assembly may be malfunctioning, or there may be a mechanical malfunction.
      Power Supply Short Record of malfunction of signal sent to steering lock motor (steering lock actuator assembly) from certification ECU (smart key ECU assembly) (short circuit) / OK or NG(Past) OK: No record of malfunction (short circuit)
      NG(Past): Record of malfunction (short circuit) exists      		 This item records malfunctions in the circuit between the certification ECU (smart key ECU assembly) and steering lock motor (steering lock actuator assembly).
      Motor Driver Short Record of malfunction of motor activation circuit in steering lock actuator assembly (short circuit) (DTC B2781 stored) / OK or NG(Past) OK: No record of malfunction (short circuit)
      NG(Past): Record of malfunction (short circuit) exists      		 This item records malfunctions in the motor activation circuit inside the steering lock actuator assembly (short circuit).
      Lock/Unlock Receive Reception state of steering lock or unlock request signal from certification ECU (smart key ECU assembly) / Yes or No Yes: Record of receiving lock or unlock request signal exists
      No: No record of receiving lock or unlock request signal      		 -
      Lock Bar Stuck Error Record of lock bar not properly unlocking after being commanded to unlock for certain amount of time / OK or NG(Past) OK: No record of stuck lock bar
      NG(Past): Record of stuck lock bar exists      		 -
      Push Start Error Record of malfunction of push-start function due to steering lock actuator assembly / OK or NG(Past) OK: No record of push-start function malfunction
      NG(Past): Record push-start function malfunction exists      		 -
      Engine Start Request Reception state of hybrid control system permission signal determined by steering lock actuator assembly and sent to certification ECU (smart key ECU assembly) / OK or NG OK: Receiving signal
      NG: Not receiving signal
      • When this item displays "OK", the certification ECU (smart key ECU assembly) has received an unlock confirmation signal from the steering lock ECU and has permitted fuel injection and hybrid control system combustion.
      • The hybrid control system cannot be started when this item displays "NG".
      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 a malfunction is present:
      • 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).
      L Code Check Verification result between ID code box (immobiliser code ECU) and steering lock ECU / 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 is not registered or the ID code box (immobiliser code ECU) or steering lock ECU is malfunctioning.
      • The steering cannot be locked.
      • The steering cannot be unlocked (the hybrid control system cannot be started).
      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
      HINT: 
      • 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 power switch on (IG) or on (ACC) or starting hybrid control system
      NG: Except above
      • If the unlock signal has not been received, the hybrid control system 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.
      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
      HINT: 
      • 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 power 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.
      S Code Check(Past) Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) (Past) / OK or NG(Past) OK: Verification result normal
      NG(Past): Verification result abnormal (Past)      		 -
      L Code Check(Past) Verification result between ID code box (immobiliser code ECU) and steering lock ECU (Past) / OK or NG(Past) OK: Verification result normal
      NG(Past): Verification result abnormal (Past)      		 -
      Steering Lock State of whether steering lock ECU has determined steering is locked / Set or Unset Set: Steering locked
      Unset: Steering unlocked      		 If this item displays "Unset", the steering does not lock.
      Steering Unlock State of whether steering lock ECU determined steering is unlocked / Set or Unset Set: Steering unlocked
      Unset: Steering locked      		 If this item displays "Unset", the steering does not unlock (hybrid control system cannot be started).

      HINT: 

      Unlock operation conditions for the steering lock:

      When the following condition is met, the unlock operation is performed:

      The power switch is on (ACC) or on (IG).

      • When the power switch is turned on (ACC) or on (IG) and the key and certification ECU (smart key ECU assembly) are verified, the steering is unlocked.

      When any of the following conditions are met, key verification is performed.

      • The brake pedal is depressed so that the hybrid control system can be started.
      • 30 seconds elapse after opening and closing a door.
      • The power switch is pressed.

      Key verification occurs when the code emitted from the key and the code stored in the certification ECU (smart key ECU assembly) are compared to check that they match.

      Certification ECU (smart key ECU assembly) verification occurs when the S code and L code are verified while the hybrid control system is being started or the power switch is being pushed. The ID code box (immobiliser code ECU) uses the S code to determine whether the certification ECU (smart key ECU assembly) is authorized. The steering lock ECU uses the L code to determine whether the ID code box (immobiliser code ECU) is authorized.

      Lock operation conditions for the steering:

      When the following conditions are met and the certification ECU (smart key ECU assembly) has been verified, the lock operation is performed.

      • The power switch is off.
      • The shift lever is in P.
      • A door is opened or a door lock operation (smart door lock, wireless door lock or key-linked lock) is performed.

      HINT: 

      The following example shows the behavior of various Data List items when the shift lever is in P, the brake pedal is not depressed, the vehicle is normal and the power source mode changes.

      GTY324441Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      Get into the vehicle while carrying the key. With the power switch off, the shift lever in P and all the doors closed, perform the following procedures and check the power source mode. 

      *1: Without depressing the brake pedal, press the power switch and check that the power source mode changes to on (ACC).

      *2: Without depressing the brake pedal, press the power switch and check that the power source mode changes to on (IG).

      *3: Press the power switch and check that the power source mode changes off.

      *4: Release the brake pedal, open the driver door and check that the steering locks.

      MAIN BODY

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FL Door Courtesy SW Front door courtesy light switch assembly LH / ON or OFF ON: Front door LH closed
      OFF: 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 related part.
  2. ACTIVE TEST 

    HINT: 

    Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

    1. Turn the power switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Body Electrical / (desired system) / Active Test.
    6. According to the display on the Techstream, perform the Active Test.
    POWER SOURCE CONTROL

    Tester Display Test Part Control Range Diagnostic Note
    P Supply for Steering Lock Certification ECU (smart key ECU assembly) ON/OFF
    HINT: 
    ON: Power is supplied
    OFF: Power is not supplied    		 When performing this Active Test, make sure the following condition is met:
    The power switch is on (IG).
scientia non olet · About LEMON Manuals