2021 Lexus LS 500h AWDFACTORY OEM SERVICE PROCEDURE

Removal [10/2017 - 09/2018]: Procedure

  1. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL 
    NOTE:

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

    Refer to INITIALIZATION [10/2017 - 09/2018]

  2. REMOVE RADIATOR COVER PLATE 

    Refer to PROCEDURE - Step 3

  3. REMOVE UPPER RADIATOR SUPPORT SEAL 

    Refer to PROCEDURE - Step 2

  4. REMOVE LOWER RADIATOR AIR DEFLECTOR 

    Refer to PROCEDURE - Step 4

  5. REMOVE ECM 
    1. Push in the locks on the 2 levers, raise the 2 levers, and disconnect the 2 ECM connectors.
      GTY791629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Raise
      Push
      NOTE:

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

    2. Remove the 2 nuts and ECM.
      NOTE:

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

      GTY810604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE NO. 1 ECM BRACKET 
    1. Remove the 2 bolts and No. 1 ECM bracket from the ECM.
      GTY810600Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

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

  7. REMOVE NO. 2 ECM BRACKET 
    1. Remove the 2 bolts and No. 2 ECM bracket from the ECM.
      GTY835041Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

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

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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