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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Hybrid Battery Control System - Service Information (2 Of 3)) >> BATTERY ECU (for LITHIUM-ION BATTERY) >> Removal [08/2020 - 08/2021] >> Procedure

Removal [08/2020 - 08/2021]: Procedure

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  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. REMOVE SERVICE PLUG GRIP 

    Refer to REMOVAL [08/2020 - 08/2021]

  3. DISCONNECT ENGINE ROOM MAIN WIRE 

    Refer to PROCEDURE - Step 3

  4. REMOVE CONNECTOR COVER ASSEMBLY 

    Refer to PROCEDURE - Step 10

  5. CHECK TERMINAL VOLTAGE 

    Refer to PROCEDURE - Step 11

  6. INSTALL CONNECTOR COVER ASSEMBLY 

    See step  6

  7. CONNECT ENGINE ROOM MAIN WIRE 

    Refer to PROCEDURE - Step 18

  8. REMOVE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY 

    Refer to REMOVAL [06/2018 - ]

  9. REMOVE REAR DOOR SCUFF PLATE LH 

    Refer to PROCEDURE - Step 9

  10. REMOVE REAR UNDER SIDE COVER LH 

    Refer to PROCEDURE - Step 4

  11. REMOVE REAR DOOR SCUFF PLATE RH 

    HINT: 

    Use the same procedure as for the LH side.

  12. REMOVE REAR UNDER SIDE COVER RH 

    Refer to PROCEDURE - Step 6

  13. REMOVE REAR UNDER COVER 

    Refer to PROCEDURE - Step 7

  14. REMOVE REAR SEAT CUSHION LEG SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 8

  15. REMOVE NO. 1 HV BATTERY COVER PANEL RH 

    See step  9

  16. REMOVE HYBRID BATTERY HOSE ASSEMBLY 

    See step  12

  17. DISCONNECT FLOOR WIRE 

    See step  16

  18. REMOVE NO. 4 HV BATTERY PROTECTOR 

    See step  15

  19. DISCONNECT FLOOR WIRE 

    See step  16

  20. REMOVE UPPER HV BATTERY COVER SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Remove the 5 bolts, 7 nuts and upper HV battery cover sub-assembly from the HV battery.
      GTY773725Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  21. REMOVE NO. 1 HV BATTERY HOSE 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Remove the 2 clips.
      GTY764099Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disengage the 2 claws to remove the No. 1 HV battery hose from the HV battery.
  22. REMOVE BATTERY ECU ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Disengage the clamp.
      GTY764097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Move the lock lever while pushing the lock, and disconnect the 3 battery ECU assembly connectors.
      NOTE:
      • Make sure to release the lock of the lock lever before moving it.
        GTY737421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Lever Lock
      • If the connector cannot be disconnected, check if the lock lever is completely unlocked.
      • Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.
    3. Remove the 3 nuts and battery ECU assembly from the HV battery.
      GTY764098Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      If the battery ECU assembly has been struck or dropped, replace it.

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