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Removal [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+ and 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. WHEN REPLACING BATTERY ECU ASSEMBLY 
    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.

    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.

    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 ignition switch to ON (READY) and wait for 5 minutes or more.
      5. Turn the ignition switch off and wait for 1 minutes or more.
      6. Disconnect the cable from the negative (-) auxiliary battery terminal.
      7. Replace the other ECU.
      8. Connect the cable to the negative (-) auxiliary battery terminal.
      9. Check that the ignition 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 HV SUPPLY BATTERY ASSEMBLY 

    Refer to REMOVAL [12/2023 - ]

  3. REMOVE NO. 1 TRACTION BATTERY COVER 
    See step  2
  4. REMOVE NO. 1 TRACTION BATTERY HEATER RELAY 
    Refer to PROCEDURE - Step 3
  5. REMOVE NO. 3 TRACTION BATTERY WIRE COVER 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.
    1. GTY1079847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the 4 connectors.
        NOTE:

        Insulate the disconnected high-voltage connector with insulating tape.

      2. Disengage the 3 clamps.
      3. Pull out the wire harness in the direction shown in the illustration.
    2. GTY1079222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the 4 connectors.
        NOTE:

        Insulate the disconnected high-voltage connector with insulating tape.

      2. Disengage the 4 clamps.
      3. Pull out the wire harness in the direction shown in the illustration.
    3. GTY1079984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE BATTERY ECU ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    NOTE:

    If the battery ECU assembly has been struck or dropped, replace it.
    1. GTY1079916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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