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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 84 (Smart Key System (Keyless Start) - Symptom Tests (Hybrid)) >> SMART KEY SYSTEM (for Start Function, HV Model) >> Symptom Tests >> Steering Lock does not Lock [04/2018 -] >> Procedure

Steering Lock does not Lock [04/2018 -]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. READ VALUE USING TECHSTREAM (LOCK REQUEST RECEIVE) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Smart Key / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Smart Key > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Lock Request Receive Status of steering lock command from certification ECU (smart key ECU assembly) OK or NG OK: Certification ECU (smart key ECU assembly) sends steering lock command (within 10 seconds of any door opened with shift lever in P and power switch off)
      NG: Certification ECU (smart key ECU assembly) does not send steering lock command (no door opened with shift lever in P and power switch off)      		 If OK is not displayed even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

      Body Electrical > Smart Key > Data List 

      Tester Display
      Lock Request Receive

      OK

      The certification ECU (smart key ECU assembly) receives a lock request signal within 10 seconds of turning the power switch from on (IG) to on (ACC) or off and opening a door with the shift lever in P, and OK is displayed on the Techstream screen.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (L CODE CHECK) 
    1. Read the Data List according to the display on the Techstream.

      Body Electrical > Smart Key > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      L Code Check Verification result between certification ECU (smart key ECU assembly) 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 certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upper bracket assembly) is not registered, or the certification ECU (smart key ECU assembly) 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).

      Body Electrical > Smart Key > Data List 

      Tester Display
      L Code Check

      OK

      OK is displayed on the Techstream.

      HINT: 

      Reasons for verification failure:

      • The steering lock ECU (steering lock actuator or upper bracket assembly) or certification ECU (smart key ECU assembly) 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

    Result: 

    NG 

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

    for Manual Tilt and Manual Telescopic Steering Column: Refer to DISASSEMBLY [04/2018 -]

    for Power Tilt and Power Telescopic Steering Column: Refer to DISASSEMBLY [04/2018 -]

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE) 
    1. Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      GTY943939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      G43-1 (GND) - Body ground Always Below 1 Ω
      NOTE:

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      G43-7 (B) - Body ground Power switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) 
    1. Connect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
    2. Move the shift lever to P and turn the power switch off.
    3. Check the signal waveform according to the condition(s) in the table below.
      GTY915673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *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

      OK

      Tester Connection Condition Tool Setting Specified Condition
      G43-3 (IGE) - G43-1 (GND) 2 V/DIV., 200 ms./DIV. Steering lock motor not operating → Operating → Not operating Pulse generation
      (See waveform)

      HINT: 

      • 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 power switch on (ACC) or on (IG).
        • To lock the steering, turn the power switch off with the shift lever in P, and then open a door.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    for Manual Tilt and Manual Telescopic Steering Column: Refer to DISASSEMBLY [04/2018 -]

    for Power Tilt and Power Telescopic Steering Column: Refer to DISASSEMBLY [04/2018 -]

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 
    1. Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
    2. Disconnect the G40 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
      G43-3 (IGE) - G40-25 (SLR+) Always Below 1 Ω
      G43-3 (IGE) or G40-25 (SLR+) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) 
    1. Connect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
    2. Connect the G40 certification ECU (smart key ECU assembly) connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G43-3 (IGE) - Body ground Power switch off 11 to 14 V
      GTY923657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

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

    for Manual Tilt and Manual Telescopic Steering Column: Refer to DISASSEMBLY [04/2018 -]

    for Power Tilt and Power Telescopic Steering Column: Refer to DISASSEMBLY [04/2018 -]

  7. READ VALUE USING TECHSTREAM (FL DOOR COURTESY SW) 
    1. Using the Techstream, check the following main body ECU (multiplex network body ECU) Data List item by opening and closing the driver door to confirm the state of the front door courtesy light switch assembly.

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FL Door Courtesy SW Front door LH courtesy light switch signal OFF or ON OFF: Front door LH closed
      ON: Front door LH open      		 -

      Body Electrical > Main Body > Data List 

      Tester Display
      FL Door Courtesy SW

      OK

      The Data List item changes in accordance with the opening and closing of the driver door.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO LIGHTING SYSTEM (Front Door Courtesy Switch Circuit). Refer to  Front Door Courtesy Switch Circuit [04/2018 -] 

    Result: 

    OK 

    See step  8

  8. READ VALUE USING TECHSTREAM (SHIFT P SIGNAL) 
    1. Move the shift lever to P.
    2. Read the Data List according to the display on the Techstream.

      Body Electrical > Power Source Control > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Shift P Signal Shift position P OFF or ON OFF: Shift lever not in P
      ON: Shift lever in P      		 Use this item to determine whether the shift lever position switch (P) is malfunctioning.

      Body Electrical > Power Source Control > Data List 

      Tester Display
      Shift P Signal

      OK

      ON is displayed on the Techstream.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO OTHER PROBLEM. Refer to  PROBLEM SYMPTOMS TABLE [04/2018 - 08/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2020 -] 

    Result: 

    OK 

    See step  9

  9. READ VALUE USING TECHSTREAM (STEERING LOCK) 
    1. Check that the steering is unlocked.
    2. Read the Data List according to the display on the Techstream.

      Body Electrical > Smart Key > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Steering Lock Steering lock ECU (steering lock actuator or upper bracket assembly) lock confirmation status Unset or Set Unset: Lock not confirmed
      Set: Lock confirmed      		 When Unset is displayed, the steering is not locked.

      Body Electrical > Smart Key > Data List 

      Tester Display
      Steering Lock

      OK

      Set is displayed on the Techstream.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

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

    for Manual Tilt and Manual Telescopic Steering Column: Refer to DISASSEMBLY [04/2018 -]

    for Power Tilt and Power Telescopic Steering Column: Refer to DISASSEMBLY [04/2018 -]

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