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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Except HV) - Diagnostics - Introduction (1 Of 2) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> Utility [12/2019 - 11/2023] >> Utility [12/2019 - 11/2023]

Utility [12/2019 - 11/2023]

  1. DESCRIPTION 
    1. If any of the parts listed in the following table are replaced or adjusted, it is necessary to perform the specified operation.
      Parts to be Replaced / Operation Necessary Operation
      Skid control ECU (brake actuator assembly) Perform "Calibration".
      Yaw rate and acceleration sensor (airbag sensor assembly)*
      1. Perform "Reset Memory".
      2. Perform "Calibration".
      Wheel alignment adjustment
      1. Perform "Reset Memory".
      2. Perform "Calibration".

      *: Even when not replacing the part, it is necessary to perform the specified necessary procedures after installation.

  2. UTILITY ITEMS 
    Utility Items Main Purpose Link
    All Readiness Confirm if DTC judgment has been completed. Refer to utility
    Calibration Enter Dealer Mode (Calibration) and perform yaw rate and acceleration sensor zero point calibration and system information memorization. Refer to utility
    Inspection Mode Enter Inspection Mode which prohibits operation of VSC and TRAC. Refer to utility
    Signal Check Enter Dealer Mode (Signal Check) and perform a signal inspection of the electronically controlled brake system. Refer to TEST MODE PROCEDURE [12/2019 - 11/2023] 
    Vehicle Control History (RoB) View vehicle control history. Refer to VEHICLE CONTROL HISTORY [12/2019 - 10/2022] , or refer to VEHICLE CONTROL HISTORY [10/2022 - 11/2023]
    Reset Memory Clear the following values:
    • steering sensor zero point
    • yaw rate and acceleration sensor zero point
    • system information
    		 Refer to utility
  3. ALL READINESS 

    HINT: 

    • With "All Readiness", you can check whether or not the DTC judgment has been completed by using the GTS.
    • You should check "All Readiness" after simulating malfunction symptoms or for validation after finishing repairs.
    1. Turn the ignition switch off.
    2. Connect the GTS to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the GTS on.
    5. Operate the GTS to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

      Chassis > Brake/EPB > Clear DTCs 

    6. Press the clear button.
    7. Turn the ignition switch off.
    8. Start the engine.
    9. Perform the DTC judgment driving pattern to run the DTC judgment.
    10. Enter the following menus: Chassis / Brake/EPB / Utility / All Readiness.

      Chassis > Brake/EPB > Utility 

      Tester Display
      All Readiness
    11. Input the DTC to be confirmed.
    12. Check the DTC judgment result.
      GTS Display Description
      Normal
      • DTC judgment completed
      • System normal
      Abnormal
      • DTC judgment completed
      • System abnormal
      Incomplete
      • DTC judgment not completed
      • Perform the driving pattern
      N/A
      • Unable to perform DTC judgment
      • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
      • Perform the driving pattern

      If the judgment result shows Incomplete or N/A, perform the DTC confirmation driving pattern again.

  4. CALIBRATION 
    NOTE:
    • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
    • After replacing or reinstalling the yaw rate and acceleration sensor (airbag sensor assembly), perform "Calibration" after performing "Reset Memory".
    • As the yaw rate and acceleration sensor zero point cannot be stored again until the current zero point is cleared, perform "Reset Memory" and yaw rate and acceleration sensor zero point calibration and system information memorization after replacing or removing and installing the yaw rate and acceleration sensor (airbag sensor assembly).
    • While obtaining the zero point, keep the vehicle stationary and do not vibrate, tilt, move, or shake it.
    • Be sure to perform this procedure on a level surface (with an inclination of less than 0.45 degrees).
    • While obtaining the zero point, make sure the tire pressure is as specified and the vehicle is in full contact with the ground (not lifted up or loaded).

    HINT: 

    When entering Dealer Mode (Calibration), the skid control ECU (brake actuator assembly) communicates with the forward recognition camera to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Dealer Mode (Calibration) within 5 seconds of entering Dealer Mode (Calibration).

    1. Clear the zero point calibration data and system information.
      1. Turn the ignition switch off.
      2. Check that the shift lever is in P.
      3. Connect the GTS to the DLC3.
      4. Turn the ignition switch to ON.
      5. Turn the GTS on.
      6. Select the skid control ECU (brake actuator assembly) to clear the zero point calibration data using the GTS. Enter the following menus: Chassis / Brake/EPB / Utility / Reset Memory.

        Chassis > Brake/EPB > Utility 

        Tester Display
        Reset Memory
      7. Using the GTS, perform "Reset Memory".
        NOTE:

        After performing "Reset Memory", the ABS warning light, brake system warning light (red indicator) and slip indicator light illuminate. If the vehicle is driven with the memory cleared, DTCs C124A-00, C051D-54 and/or C1210-54 will be stored.

    2. Perform "Calibration".

      HINT: 

      • Yaw rate and acceleration sensor zero point calibration and store system information memorization are automatically performed immediately after Dealer Mode (Calibration) is entered.
      • If store system information memorization has not yet been performed, the slip indicator light will remain on and DTC C124A-00 will be stored.
      • If yaw rate and acceleration sensor zero point calibration is not successful, the slip indicator light will remain on and DTC C051D-54 and/or C1210-54 will be stored.
      1. Turn the ignition switch off.
      2. Check that the shift lever is in P.
      3. Connect the GTS to the DLC3.
      4. Turn the ignition switch to ON.
      5. Check that the steering wheel is centered.
      6. Turn the GTS on.
      7. Switch the skid control ECU (brake actuator assembly) to calibration using the GTS. Enter the following menus: Chassis / Brake/EPB / Utility / Calibration.

        Chassis > Brake/EPB > Utility 

        Tester Display
        Calibration
      8. Using the GTS, perform "Calibration" and enter Dealer Mode (Calibration).
      9. Confirm that the ABS warning light and slip indicator light indicate the Dealer Mode pattern (blinking at 0.25 second intervals).

        HINT: 

        • After "Calibration" has successfully completed, the ABS warning light and slip indicator light indicate the Dealer Mode pattern (blinking at 0.25 second intervals).
        • The slip indicator light may illuminate for approximately 7 seconds before learning successfully completes.
        • When entering Dealer Mode (Calibration), if the parking brake is engaged, the parking brake indicator light (red) will illuminate, and if the parking brake is not engaged, the parking brake indicator light (red) will blink in the Dealer Mode pattern (blinking at 0.25 second intervals).
        • Do not exit Dealer Mode (Calibration) within 5 seconds of entering Dealer Mode (Calibration). If Dealer Mode (Calibration) is exited within 5 seconds of entering Dealer Mode (Calibration), DTC U023A-87 may be stored. If DTC U023A-87 is output after exiting Dealer Mode (Calibration), enter Dealer Mode (Calibration) again, wait at least 5 seconds, then recheck for DTCs.
      10. Turn the ignition switch off.
      11. Disconnect the GTS.
  5. INSPECTION MODE (WHEN USING GTS) 
    1. Activating Inspection Mode
      NOTE:
      • Inspection Mode will be canceled when the ignition switch is turned off. Make sure to enter Inspection Mode again if the inspection is continued after the ignition switch is turned off.
      • Never drive the vehicle while in Inspection Mode.
      1. Ensure that the ignition switch is off and the engine is stopped.
      2. Connect the GTS to the DLC3.
      3. Turn the ignition switch to ON.
      4. Turn the GTS on.
      5. Enter the following menus: Chassis / Brake/EPB / Utility / Inspection Mode.

        Chassis > Brake/EPB > Utility 

        Tester Display
        Inspection Mode
      6. Check that the VSC OFF indicator light comes on and "Traction Control Turned Off" is displayed on the multi-information display (Confirm that the system has entered Inspection Mode).
    2. End of Inspection Mode.
      1. Turning the ignition switch off ends Inspection Mode.
        NOTE:

        If the ignition switch is turned to ON within 60 seconds of being turned off, the system will reenter Inspection Mode.

      2. Confirm that the VSC OFF indicator light turns off and the "Traction Control Turned Off" on the multi-information display is cleared (Confirm that Inspection Mode is canceled).
  6. INSPECTION MODE (WHEN NOT USING GTS) 
    1. Activating Inspection Mode
      NOTE:
      • Inspection Mode will be canceled when the ignition switch is turned off. Make sure to enter Inspection Mode again if the inspection is continued after the ignition switch is turned off.
      • Never drive the vehicle while in Inspection Mode.

      HINT: 

      Perform steps "C" to "G" within 30 seconds.

      1. Turn the ignition switch to ON (Step "A").
      2. Release the parking brake (Step "B").
      3. With the brake pedal depressed, start the engine (Step "C").
      4. While holding the brake pedal down, apply the parking brake (Step "D").
      5. With the parking brake applied, depress and release the brake pedal twice (Step "E").
      6. While holding the brake pedal down, release and apply the parking brake twice (Step "F").
      7. With the parking brake applied, depress and release the brake pedal twice (Step "G").
      8. Check that the VSC OFF indicator light comes on and "Traction Control Turned Off" is displayed on the multi-information display (Confirm that the system has entered Inspection Mode).
    2. End of Inspection Mode.
      1. Turning the ignition switch off ends Inspection Mode.
        NOTE:

        If the ignition switch is turned to ON within 60 seconds of being turned off, the system will reenter Inspection Mode.

      2. Confirm that the VSC OFF indicator light turns off and the "Traction Control Turned Off" on the multi-information display is cleared (Confirm that Inspection Mode is canceled).
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