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Removal [09/2018 - 10/2020]: 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).

        HINT: 

        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 

    Refer to PRECAUTION [10/2017 - 09/2019] , or refer to PRECAUTION [09/2019 - 10/2020]

  3. REMOVE HV BATTERY ASSEMBLY 

    Refer to REMOVAL [09/2018 - 10/2020] 

  4. REMOVE UPPER HV BATTERY COVER PANEL 

    Refer to PROCEDURE - Step 4

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

    Refer to PROCEDURE - Step 5

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

    Refer to PROCEDURE - Step 6

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

    Refer to PROCEDURE - Step 8

  8. REMOVE BATTERY VOLTAGE SENSOR (for Upper Side) 

    Refer to PROCEDURE - Step 9

  9. REMOVE BATTERY ECU ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Disconnect the 2 connectors.
      GTY793585Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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.
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