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Removal [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    NOTE:

    When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

    Refer to INITIALIZATION [11/2021 - 09/2022] , or refer to INITIALIZATION [09/2022 - 10/2023] , or refer to INITIALIZATION [10/2023 - ]

  2. REMOVE ENGINE ROOM ECU COVER 
    NOTE:
    • Remove all water on and around the engine room ECU cover.
    • Perform the inspection indoors to avoid rain.
    • Be sure to prevent water intrusion to the ECM (connectors and screw parts).
    1. Remove the 3 bolts and engine room ECU cover.
      GTY515705Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. DISENGAGE WIRE HARNESS 
    1. Disconnect the engine wire harness connector (A) as shown in the illustration.
      GTY1084343Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 3 engine wire harness connectors (B).
    3. Using a screwdriver, disengage the claw.
      GTY1084294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disengage the guide and disconnect the connector holder from the engine room ECU box.
    5. Disconnect the engine wire harness connector.
      GTY1084269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Disconnect the 6 ECM connectors and transmission control ECU assembly connector.
      GTY1084468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      After disconnecting the ECM connectors, make sure that dirt, water or other foreign matter does not contact the connecting parts of the ECM connectors.

    7. Disengage the wire harness clamp.
      GTY515709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Disengage the wire harness from the engine room ECU box.
  4. REMOVE ECM 
    1. Remove the 2 nuts and ECM from the engine room ECU box.
      NOTE:

      If the ECM has been struck or dropped, replace it.

      GTY515706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE NO. 1 ECM BRACKET 
    1. Remove the 2 screws and No. 1 ECM bracket from the ECM.
      GTY417832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE NO. 2 ECM BRACKET 
    1. Remove the 2 screws and No. 2 ECM bracket from the ECM.
      GTY404553Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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