BATTERY ECU REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during battery ECU assembly removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced
Replaced Part or Performed Procedure Necessary Procedures Effect/Inoperative Function when Necessary Procedure not Performed Link
Battery ECU assembly Perform Current sensor offset learning DTCs are stored

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Disconnect cable from negative auxiliary battery terminal Memorize steering angle neutral point LKA/LDA system

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Pre-collision system
Parking assist monitor system

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Steering sensor zero point calibration Variable gear ratio steering system

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HV battery

  • Prediagnostic battery charge

  • Battery diagnosis

  • Battery status info update

 Warning Light Illumination

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Electric parking brake ECU

  • Reset memory

  • Acquire tension sensor zero point

 Electric parking brake system

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DRS ECU (rear steering control ECU) Perform Neutral Position Memorization and Motor Rotation Angle Sensor Calibration

  • Dynamic rear steering system

  • Steering wheel off-center

  • DTCs are output

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  • Front seat assembly RH (Only for removal and installation)

  • Front seat assembly LH (Only for removal and installation)

 Initialize position control ECU Front Power Seat Control System

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Spoiler control ECU assembly Initialization Active rear wing system

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CAUTION:


  • B004A7G

    Orange wire harnesses and connectors indicate high-voltage circuits. To prevent electric shock, always follow the procedure described in the repair manual.

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  • B004BJX

    To prevent electric shock, wear insulated gloves when working on wire harnesses and components of the high voltage system.

Note


  • The type of battery ECU assembly to be used varies depending on the vehicle model.

  • B0049UTC01
    *a Black Label

    The type of battery ECU assembly can be confirmed by the color of the label.

  • If the wrong type of battery ECU assembly is installed, the power switch cannot be turned on (READY).

  • After installing the battery ECU assembly, perform the following to check that the power switch can be turned on (READY).


    • Turn the power switch on (READY).

    • Turn the power switch off and wait for 30 seconds or more.

    • Turn the power switch on (READY) again.

PROCEDURE


  1. WHEN REPLACING BATTERY ECU ASSEMBLY

    HV battery learning values are stored in the battery ECU assembly and ECM and are used to detect malfunctions and illuminate the hybrid battery indicator light in the combination meter assembly. When either of these ECUs is replaced, the new ECU receives the HV battery learning values from the other ECU and stores them.

    Note


    • Do not replace the battery ECU assembly and ECM at the same time as the HV battery learning values will be lost. However, if it is necessary to replace both ECUs at the same time, replace them by following the procedure below.

    • Do not replace the battery ECU assembly or ECM with a used one from another vehicle.


    1. Procedure when replacing both battery ECU assembly and ECM:


      1. Disconnect the cable from the negative (-) auxiliary battery terminal.

      2. Replace either ECU.

      3. Connect the cable to the negative (-) auxiliary battery terminal.

      4. Turn the power switch on (READY) and wait for 5 minutes or more.

      5. Turn the power switch off and disconnect the cable from the negative (-) auxiliary battery terminal.

      6. Replace the other ECU.

      7. Connect the cable to the negative (-) auxiliary battery terminal.

      8. Check that the power switch can be turned on (READY).

        Tech Tips

        If the battery ECU assembly and ECM are replaced at the same time without following the above procedure, replace either of the ECUs with its original one and then replace it again by following the above procedure. If the correct procedure is not followed, perform the procedure again from the beginning.

  2. PRECAUTION

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  3. REMOVE HV BATTERY ASSEMBLY

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  4. REMOVE UPPER HV BATTERY COVER PANEL

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  5. REMOVE NO. 2 HYBRID BATTERY SHIELD SUB-ASSEMBLY

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  6. REMOVE NO. 1 HYBRID BATTERY SHIELD SUB-ASSEMBLY

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  7. REMOVE UPPER NO. 1 HYBRID BATTERY COVER SUB-ASSEMBLY

    Click here

  8. REMOVE BATTERY VOLTAGE SENSOR (for Upper Side)

    Click here

  9. REMOVE BATTERY ECU ASSEMBLY

    CAUTION:

    Be sure to wear insulated gloves and protective goggles.


    1. B004BCS

      Disconnect the 2 connectors.

      Note

      Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector

    2. Remove the 2 nuts and battery ECU assembly.

      Note


      • Do not drop the battery ECU assembly, strike it with tools or subject it to impact.

      • If the battery ECU assembly is subjected to an impact, replace it with a new one.