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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Hybrid Battery Control System - Service Information (1 Of 3)) >> INVERTER WITH CONVERTER (for PHEV Model) >> Removal [12/2023 - ] >> Procedure

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. PRECAUTION 
    NOTE:

    After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Refer to BEFORE DISCONNECTING BATTERY [09/2023 - ]

    Refer to PRECAUTION [09/2023 - ]

  2. REMOVE SERVICE PLUG GRIP 

    Refer to REMOVAL [12/2023 - ]

  3. DRAIN COOLANT (for Inverter) 

    Refer to PROCEDURE - Step 1

  4. REMOVE AIR CLEANER ASSEMBLY WITH AIR CLEANER HOSE 

    Refer to PROCEDURE - Step 12

  5. REMOVE ECM 

    Refer to REMOVAL [12/2023 - ]

  6. REMOVE NO. 2 INVERTER PROTECTOR 
    1. GTY1238777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. CHECK TERMINAL VOLTAGE 
    WARNING:

    Be sure to wear insulated gloves.

    NOTE:

    Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
    1. GTY1236583Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the 2 bolts (A).
      2. Using a T20 "TORX" socket wrench, remove the bolt (B) and connector cover assembly from the hybrid motor control inverter assembly.
    2. GTY1237963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a terminal - -
      1. Using a voltmeter, measure the voltage between the terminals of the 2 phase connectors.

        Standard Voltage

        0 V

        NOTE:

        Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.

        HINT: 

        Use a measuring range of DC 750 V or more on the voltmeter.

    3. GTY1236583Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using a T20 "TORX" socket wrench, install the connector cover assembly to the inverter with converter assembly with the bolt (B).

        Torque: 2.0 N.m (20 kgf/cm, 

        NOTE:

        Do not touch the connector cover assembly waterproof seal.

      2. Install the 2 bolts (A).

        Torque: 8.0 N.m (82 kgf/cm, 71 in.lbf) 

        HINT: 

        It is not necessary to install the 2 bolts (A) if it is to be removed in the next step or later, such as when removing the inverter with converter assembly.

  8. DISCONNECT ENGINE ROOM MAIN WIRE 
    WARNING:

    Be sure to wear insulated gloves.

    NOTE:

    Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
    1. GTY1235841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Move the lock lever as shown in the illustration and disconnect the hybrid motor control inverter assembly connector.
        NOTE:
        • Do not touch the waterproof seal or terminals of the connector.
        • Do not damage the terminals, connector housing or hybrid motor control inverter assembly during disconnection.
        • Cover the hole where the cable was connected with tape (non-residue type) or equivalent to prevent entry of foreign matter.
        • Insulate the disconnected terminals with insulating tape.
      2. Remove the bolt.
      3. Disengage the clamp and disconnect the engine room main wire.
  9. INSTALL NO. 2 FUEL VAPOR FEED HOSE ASSEMBLY 
    1. GTY1229233Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. DISCONNECT FLOOR UNDER WIRE 
    WARNING:

    Be sure to wear insulated gloves.
    1. GTY1229230Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. GTY1229231Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. GTY1241306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Waterproof Seal - -
      1. Disconnect the HV floor under wire from the hybrid motor control inverter assembly.
        NOTE:
        • Do not touch the waterproof seal or terminals of the connector.
        • Do not damage the terminals, connector housing or hybrid motor control inverter assembly during disconnection.
        • Cover the hole where the cable was connected with tape (non-residue type) or equivalent to prevent entry of foreign matter.
        • Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
        • Insulate the disconnected terminals with insulating tape.
  11. DISCONNECT ENGINE WIRE 
    WARNING:

    Be sure to wear insulated gloves.

    NOTE:
    • After disconnecting the engine wire, cover the connector of the generator temperature sensor and resolver (transmission fluid temperature sensor) with tape (nonresiduetype) or equivalent to prevent the entryof foreign matter or water.
      GTY1233416Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
    1. GTY1238858Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Move the lock lever as shown in the illustration and disconnect the hybrid motor control inverter assembly connector.
        NOTE:
        • Do not touch the waterproof seal or terminals of the connector.
        • Do not damage the terminals, connector housing or hybrid motor control inverter assembly during disconnection.
        • Cover the hole where the cable was connected with tape (non-residue type) or equivalent to prevent entry of foreign matter.
        • Insulate the disconnected terminals with insulating tape.
    2. GTY1229235Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. GTY1231407Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Generator Temperature Sensor Connector *b Resolver (Transmission Fluid Temperature Sensor) Connector
    4. GTY1233414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. DISCONNECT NO. 4 INVERTER COOLING HOSE 
    1. GTY1240961Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Slide the clip and disconnect the No. 4 inverter cooling hose from the hybrid motor control inverter assembly.
        NOTE:

        Put pieces of cloth into the pipe and disconnected hose or cover the pipe and hose with plastic bags to prevent entry of foreign matter.

  13. DISCONNECT NO. 3 INVERTER COOLING HOSE 
    1. GTY1234403Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Slide the clip and disconnect the No. 3 inverter cooling hose from the hybrid motor control inverter assembly.
        NOTE:

        Put pieces of cloth into the pipe and disconnected hose or cover the pipe and hose with plastic bags to prevent entry of foreign matter.

  14. REMOVE UPPER INVERTER COVER SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves.
    1. GTY1229130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Interlock *b Waterproof Seal
      1. Loosen the 2 bolts, leaving 2 to 3 threads at the tip of the bolt still engaged.
      2. Using the 2 bolts as guides, remove the upper inverter cover from the hybrid motor control inverter assembly.
        NOTE:
        • Make sure to pull the inverter cover straight out, as a connector is connected to the inside of the inverter cover.
        • Do not touch the waterproof seal of the inverter cover.
        • Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
        • When removing the inverter cover, do not pull the areas (A) as they may deform.
        • Make sure that the interlock is installed to the inverter cover.
        • Do not remove or excessively tighten the screw of the inverter cover.
          GTY1052470Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
          *a Screw
        • Although the inverter cover may feel loose, this is not due to a malfunction.
        • Hold the upper inverter cover horizontal while removing it.
          GTY1106305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        If necessary, use a screwdriver with its tip wrapped with protective tape as shown in the illustration to remove the inverter cover.

        GTY1131950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Remove the 2 bolts.
  15. DISCONNECT MOTOR CABLE 
    WARNING:

    Be sure to wear insulated gloves.

    NOTE:

    Adhere to the following removal procedure. Otherwise, the connector and the hybrid motor control inverter assembly may be damaged.
    1. GTY1080475Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using an insulated tool, remove the 6 bolts.
        NOTE:
        • Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
        • Do not touch the waterproof seal or terminals of the connector.
    2. GTY1079070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Waterproof Seal - -
      1. Remove the 4 bolts and disconnect the motor cable from the hybrid motor control inverter assembly.
        NOTE:
        • Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
        • Do not touch the waterproof seal or terminals of the connector.
        • Do not damage the terminals, connector housing or hybrid motor control inverter assembly during disconnection.
        • Insulate the disconnected terminals with insulating tape.
        • After disconnecting the motor cable, wrap it with a plastic bag or equivalent to protect it.
        • Cover the hole where the cable was connected with tape (non-residue type) or equivalent to prevent entry of foreign matter.
        • GTY1239379Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. REMOVE HYBRID MOTOR CONTROL INVERTER ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves.
    1. GTY1231855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the 5 bolts, 2 nuts and hybrid motor control inverter assembly.
        NOTE:
        • When removing the hybrid motor control inverter assembly, be careful not to damage the parts around it.
        • To prevent damage, do not hold the hybrid motor control inverter assembly by the connectors, brackets or cooling pipes.
        • To prevent damage due to static electricity, do not touch the terminals of the disconnected connectors.

        HINT: 

        Even after the coolant is drained, coolant remains in the inverter due to its internal structure. Therefore, seal or cover the pipes when removing the hybrid motor control inverter assembly so that coolant does not spill out.

  17. REMOVE NO. 1 INVERTER BRACKET 
    NOTE:

    Make sure to support the hybrid motor control inverter assembly at the positions shown in the illustration, otherwise it may be damaged.

    1. *a: Bottom of hybrid motor control inverter assembly

      *b: Support

    GTY1066126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. GTY1232285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Set the hybrid motor control inverter assembly on wooden blocks.
      2. Remove the 2 bolts and No. 1 inverter bracket from the hybrid motor control inverter assembly.
  18. REMOVE NO. 2 INVERTER BRACKET 
    1. GTY1233417Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. REMOVE NO. 1 WATER HOSE CLAMP BRACKET 
    1. GTY1233403Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  20. REMOVE WIRE HARNESS CLAMP BRACKET 
    1. GTY1233402Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  21. REMOVE WIRE HARNESS CLAMP BRACKET 
    1. GTY1233401Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  22. REMOVE WIRE HARNESS CLAMP BRACKET 
    1. GTY1240243Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  23. REMOVE WIRE HARNESS CLAMP BRACKET 
    1. GTY1233400Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  24. REMOVE WIRE HARNESS CLAMP BRACKET 
    1. GTY1233411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  25. REMOVE HYBRID INVERTER PROTECTOR ASSEMBLY 
    1. GTY1233399Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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