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Home >> Lexus >> 2019 >> LS 500 Base, RWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System - Service Information (1 Of 3) >> Front Air Conditioning Unit >> Removal [10/2022 - 10/2023] >> Procedure

Removal [10/2022 - 10/2023]: Procedure

  1. PRECAUTION 
    NOTE:

    Perform these service operations when removing and installing the instrument panel reinforcement assembly.

    • The No. 1 instrument panel spacer installed to the vehicle and the No. 2 instrument panel spacer installed to the instrument panel reinforcement assembly is equipped with an automatic adjustment function that closes the gap between the instrument panel reinforcement assembly and vehicle when the installation bolt is tightened. However, when the instrument panel reinforcement assembly is removed and installed, this function may be lost, so make sure to replace the No. 1 instrument panel spacer and No. 2 instrument panel spacer with a new one.
    • If it is necessary to replace the instrument panel extension spacer, use a new one of the same color as that which was removed.
  2. AIR SUSPENSION CONTROL PROHIBITED (w/ Air Suspension) 

    Refer to PRECAUTION [12/2017 - ]

  3. REMOVE V-BANK COVER SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 11

  4. REMOVE RADIATOR COVER PLATE 

    See step  1

  5. REMOVE UPPER RADIATOR SUPPORT SEAL 

    See step  2

  6. REMOVE LOWER RADIATOR AIR DEFLECTOR 

    See step  3

  7. DISCONNECT NO. 1 ENGINE UNDER COVER ASSEMBLY 

    Refer to PROCEDURE - Step 1

  8. REMOVE OIL PAN PROTECTOR (for 2WD) 

    Refer to PROCEDURE - Step 7

  9. REMOVE ENGINE UNDER COVER BRACKET RH (for AWD) 

    Refer to PROCEDURE - Step 3

  10. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM 

    See step  4

  11. DRAIN ENGINE COOLANT 

    Refer to PROCEDURE - Step 8

  12. ALIGN FRONT WHEELS FACING STRAIGHT AHEAD 
  13. PRECAUTION 
    WARNING:

    Some of these service operations affect the SRS airbag system. Read the precautionary notices concerning the SRS airbag system before servicing.

    GTY824211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Refer to PRECAUTION [11/2021 - 10/2023]

    NOTE:

    After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal.

    Refer to PRECAUTION [10/2020 - 10/2023]

  14. REMOVE LUGGAGE COMPARTMENT MAT SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 25

  15. REMOVE FRONT SEAT ASSEMBLY LH 

    Refer to REMOVAL [10/2022 - 10/2023]

  16. REMOVE FRONT SEAT ASSEMBLY RH 

    HINT: 

    Use the same procedure as for the front seat assembly LH.

  17. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    WARNING:
    • Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
    • If the airbag deploys for any reason, it may cause a serious accident.
    GTY581108Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:

    It is necessary to remove the shift control ECU while no power is being supplied from the sub-battery. Therefore, perform the following procedures.

    1. Turn the engine switch off.
    2. Check that the ODO meter display has turned off.

      HINT: 

      The ODO meter continues to display for 30 seconds after turning off. Therefore, allow sufficient time for the shift control ECU to enter sleep mode and for the sub-battery power supply to end. In addition to monitoring the sub-battery voltage directly, the only other method for checking on the vehicle is to use the ODO meter display.

    3. Check that the voltage between the terminals of the sub-battery assembly with control is 0 V.
      GTY816277Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to REMOVAL [10/2022 - 10/2023]

    4. Disconnect the cable from the negative (-) battery terminal.

      Refer to PROCEDURE - Step 4

  18. REMOVE INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY 

    Refer to REMOVAL [10/2022 - 10/2023]

  19. REMOVE HEADUP DISPLAY (w/ Headup Display) 

    Refer to PROCEDURE - Step 5

  20. REMOVE STEERING COLUMN ASSEMBLY 

    Refer to REMOVAL [10/2022 - 10/2023]

  21. REMOVE FRONT WIPER MOTOR AND LINK 

    Refer to REMOVAL [10/2020 - ]

  22. REMOVE COWL VENTILATOR SPLASH SHIELD RH 
    1. Detach the clip and guide.
      GTY835794Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Detach the claw and remove the cowl ventilator splash shield RH.
  23. REMOVE HOLE PLUG 
    1. Remove the 2 hole plugs.
      GTY813974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  24. REMOVE FENDER APRON BRACE SUB-ASSEMBLY LH 
    1. Remove the 2 bolts and fender apron brace sub-assembly LH.
      GTY775691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  25. DISCONNECT AIR CONDITIONING TUBE AND ACCESSORY ASSEMBLY 
    1. Remove the bolt.
      GTY813978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Rotate the 1-point tightening plate in the direction of the arrow shown in the illustration.
      NOTE:

      Do not apply excessive force to the air conditioning tube and accessory assembly.

      GTY828378Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Rotate in this Direction
    3. Disconnect the air conditioning tube and accessory assembly.
      GTY827405Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Do not apply excessive force to the air conditioning tube and accessory assembly.

    4. Remove the 2 O-rings from the air conditioning tube and accessory assembly.
      NOTE:

      Seal the openings of the disconnected parts using vinyl tape to prevent the entry of moisture and foreign matter.

  26. REMOVE COOLER PIPE GROMMET 
    1. Remove the cooler pipe grommet.
      GTY813984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  27. REMOVE FENDER APRON BRACE SUB-ASSEMBLY RH 
    1. Detach the clamp.
      GTY775386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 2 bolts and fender apron brace sub-assembly RH.
      GTY775383Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  28. REMOVE NO. 1 RELAY BLOCK COVER 

    Refer to PROCEDURE - Step 6

  29. DISCONNECT NO. 14 CONNECTOR HOLDER 

    HINT: 

    After disconnecting the wire harness, secure it with tape or equivalent to keep it out of the way.

    1. Disconnect the 2 connectors.
      GTY775744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to PROCEDURE - Step 4

    2. Detach the clamp.
    3. Using a thin-bladed screwdriver with its tip wrapped with protective tape, detach the claw and pull up the No. 1 semiconductor power integration ECU.
      GTY775553Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Protective Tape
      NOTE:
      • Make sure the connector terminal is free from oil and grease.
      • Do not subject the No. 1 semiconductor power integration ECU to any impact.
      • Do not use a No. 1 semiconductor power integration ECU that has been dropped.
      • Do not disassemble the No. 1 semiconductor power integration ECU.
    4. Disconnect the 2 connectors.
      GTY821774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Rotate in this Direction
      Connector
      Lever Connector
    5. Using a thin-bladed screwdriver with its tip wrapped with protective tape, detach the claw and disconnect the lever connector.
    6. Using a thin-bladed screwdriver with its tip wrapped with protective tape, detach the claw and disconnect the No. 14 connector holder from the No. 17 connector holder.
      GTY777678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Disconnect in this Direction Protective Tape
  30. DISCONNECT OUTLET HEATER WATER HOSE 

    Refer to PROCEDURE - Step 51

  31. DISCONNECT INLET HEATER WATER HOSE 

    Refer to PROCEDURE - Step 50

  32. REMOVE OUTLET HEATER WATER HOSE 
    1. Detach the clamp.
      GTY785171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for 2WD
      *B for AWD
    2. Using pliers, grip the claws of the hose clip and slide the hose clip to remove the outlet heater water hose.
      NOTE:
      • Do not apply excessive force to the outlet heater water hose.
      • Prepare a drain pan or cloth in case the coolant leaks.
      GTY823791Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for 2WD
      *B for AWD
  33. REMOVE INLET HEATER WATER HOSE 
    1. Using pliers, grip the claws of the hose clip and slide the hose clip to remove the inlet heater water hose.
      NOTE:
      • Do not apply excessive force to the inlet heater water hose.
      • Prepare a drain pan or cloth in case the coolant leaks.
      GTY813654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for 2WD
      *B for AWD
  34. REMOVE HEATER PIPE GROMMET 
    1. Remove the heater pipe grommet.
      GTY813979Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  35. REMOVE REAR DOOR SCUFF PLATE LH 

    Refer to PROCEDURE - Step 15

  36. REMOVE LOWER CENTER PILLAR GARNISH LH 

    Refer to PROCEDURE - Step 19

  37. REMOVE REAR DOOR SCUFF PLATE RH 

    HINT: 

    Use the same procedure described for the LH side.

  38. REMOVE LOWER CENTER PILLAR GARNISH RH 

    HINT: 

    Use the same procedure described for the LH side.

  39. REMOVE ACCELERATOR PEDAL PAD 

    Refer to PROCEDURE - Step 2

  40. REMOVE ACCELERATOR PEDAL 

    Refer to PROCEDURE - Step 3

  41. REMOVE FRONT FLOOR CAUTION PLATE COVER 
    1. Detach the claw and guide and remove the front floor caution plate cover.
      GTY808769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  42. REMOVE AIR DUCT PLUG 
    1. Detach the claw and remove the 2 air duct plugs.
      GTY805818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      Use the same procedure for the opposite side.

  43. REMOVE REAR NO. 3 AIR DUCT 
    1. Remove the 2 screws.
      GTY805884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      Use the same procedure for the opposite side.

    2. Remove the rear No. 3 air duct in the direction of the arrow shown in the illustration.
      GTY782212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Remove in this Direction

      HINT: 

      Use the same procedure for the opposite side.

  44. REMOVE FRONT FLOOR FRONT CARPET ASSEMBLY 
    1. Detach the clamp.
      GTY799610Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      Use the same procedure for the opposite side.

    2. Using a clip remover, remove the clip.
      GTY827183Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Pull Out Fold Up
      Fastener - -
    3. Detach the 2 fasteners.
    4. Remove some of the front floor front carpet assembly in the order shown in the illustration until the front floor mat LH can be removed.
    5. Using a clip remover, remove the clip.
      GTY811497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Pull Out Fold Up
    6. Remove some of the front floor front carpet assembly in the order shown in the illustration until the front floor mat RH can be removed.
  45. REMOVE REAR AIR DUCT GUIDE LH 
    1. Detach the claw and remove the rear air duct guide LH.
      GTY831577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Remove in this Direction
  46. REMOVE REAR NO. 2 AIR DUCT 
    1. Remove the rear No. 2 air duct.
      GTY794580Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for 2WD
      *B for AWD
      Remove in this Direction
  47. REMOVE FRONT FLOOR MAT LH 
    1. Remove the front floor mat LH.
      GTY798527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for 2WD *B for AWD
  48. REMOVE REAR AIR DUCT GUIDE RH 

    HINT: 

    Use the same procedure as for the LH side.

  49. REMOVE REAR NO. 1 AIR DUCT 
    1. Remove the rear No. 1 air duct.
      GTY792826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A except Rear Power Seat with Ottoman
      *B for Rear Power Seat with Ottoman
      Remove in this Direction
  50. REMOVE FRONT FLOOR MAT RH 
    1. Remove the front floor mat RH.
      GTY812271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A except Rear Power Seat with Ottoman *B for Rear Power Seat with Ottoman
  51. REMOVE NO. 2 AIR DUCT SUB-ASSEMBLY 
    1. Using a clip remover, remove the clip and the No. 2 air duct sub-assembly.
      GTY830376Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Remove in this Direction
  52. REMOVE INSTRUMENT PANEL WIRE 
    1. Disconnect the connector and detach the clamp.
      GTY827338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the connector.
      GTY775389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Detach the clamp.
  53. REMOVE SEMICONDUCTOR POWER INTEGRATION ECU (w/ PTC Heater) 

    Refer to PROCEDURE - Step 6

  54. REMOVE SEMICONDUCTOR POWER INTEGRATION ECU (w/o PTC Heater) 

    HINT: 

    Use the same procedure for the semiconductor power integration ECU (w/ PTC Heater).

  55. REMOVE SHIFT CONTROL ECU 
    1. for 2WD:

      Refer to PROCEDURE - Step 7

    2. for AWD:

      Refer to PROCEDURE - Step 7

  56. REMOVE FRONT STEERING CONTROL ECU (w/ VGRS) 

    Refer to PROCEDURE - Step 10

  57. REMOVE PASSENGER SIDE JUNCTION BLOCK ASSEMBLY WITH NETWORK GATEWAY ECU 

    Refer to PROCEDURE - Step 8

  58. REMOVE WIRING HARNESS CLAMP BRACKET 
    1. Remove the screw and wiring harness clamp bracket.
      GTY815287Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  59. REMOVE NO. 1 INSTRUMENT PANEL BRACE SUB-ASSEMBLY 
    1. Detach the clamp.
      GTY805521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
      Screw
    2. Remove the 2 nuts, bolt, screw and No. 1 instrument panel brace sub-assembly.
  60. REMOVE NO. 2 INSTRUMENT PANEL BRACE SUB-ASSEMBLY 
    1. Detach the clamp.
      GTY827199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
      Screw
    2. Remove the 2 nuts, bolt, screw and No. 2 instrument panel brace sub-assembly.
  61. REMOVE INSTRUMENT PANEL WIRE 
    1. Detach the clamp.
      GTY799669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 2 connectors.
  62. REMOVE NO. 3 INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY 
    1. Detach the clamp.
      GTY811527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
    2. Remove the bolt, nut and No. 3 instrument panel to cowl brace sub-assembly.
  63. REMOVE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Refer to PROCEDURE - Step 11

  64. REMOVE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WITH MAIN BODY ECU 

    Refer to PROCEDURE - Step 6

  65. REMOVE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Refer to PROCEDURE - Step 2

  66. REMOVE INSTRUMENT PANEL WIRE 
    1. Disconnect the 4 connectors.
      GTY970038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt Connector
    2. Remove the 2 nuts.
    3. Detach the clamp.
    4. w/ VGRS:
      GTY828128Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Pinch
      Release in this Direction
      1. Detach the clamp.
      2. Disconnect the connector.

        HINT: 

        Move the lock lever in the direction of the arrow shown in the illustration.

  67. REMOVE NO. 2 HEATER TO REGISTER DUCT 
    1. Using a clip remover, remove the 3 clips and No. 2 heater to register duct.
      GTY799670Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  68. REMOVE NO. 3 HEATER TO REGISTER DUCT 
    1. Remove the screw.
      GTY836751Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Screw
      Clip
    2. Using a clip remover, remove the 2 clips and No. 3 heater to register duct.
  69. REMOVE DRAIN COOLER HOSE (for Driver's Side) 
    1. Remove the drain cooler hose (for driver's side).
      GTY832637Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Detach the guide.
  70. REMOVE DRAIN COOLER HOSE (for Front Passenger Side) 
    1. Remove the drain cooler hose (for front passenger side).
      GTY799684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Detach the guide.
  71. REMOVE INSTRUMENT PANEL REINFORCEMENT ASSEMBLY WITH AIR CONDITIONING UNIT ASSEMBLY 
    NOTE:
    • Be sure to support the air conditioning unit assembly when removing it because failure to do so may cause the bracket of the air conditioning unit assembly to break.
    • When disassembling the air conditioning unit assembly, eliminate static electricity by touching the vehicle body to prevent the components from being damaged.
    1. Using a universal socket wrench 12 mm, remove the 2 bolts (A).
      GTY806538Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt (A) - -
    2. Using a universal socket wrench 12 mm, remove the bolt (B).
      GTY790105Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt (B) Bolt (C)
      Bolt (D) Nut
    3. Remove the bolt (C).
    4. Remove the 4 bolts (D) and nut.
    5. Remove the instrument panel reinforcement assembly with air conditioning unit assembly from the guide as shown in the illustration.
      GTY970964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      After detaching from the lift up guide, pull it towards you to remove it from the vehicle - -
      NOTE:

      Be careful not to damage the internal components of the instrument panel reinforcement assembly and air conditioning unit assembly on the glass etc. Only perform removal after first taking the appropriate actions.

  72. REMOVE LOWER DEFROSTER NOZZLE ASSEMBLY 
    1. Detach the claw and remove the lower defroster nozzle assembly.
      GTY970890Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  73. REMOVE ID CODE BOX (IMMOBILISER CODE ECU) 

    Refer to PROCEDURE - Step 5

  74. REMOVE AIR CONDITIONER UNIT ASSEMBLY 
    1. Detach the clamp.
      GTY970892Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 3 bolts.
      GTY970636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Remove in this Direction - -
    3. Remove the instrument panel reinforcement assembly from the air conditioner unit assembly.
      NOTE:

      Be sure to hold the air conditioner unit assembly by the case when carrying it.(Do not carry the air conditioning unit by holding the heater pipe, cooler pipe, servo motor, brushless motor, harness, air inlet door or link.)

  75. REMOVE NO. 1 INSTRUMENT PANEL SPACER 
    1. Detach the claw and remove the No. 1 instrument panel spacer.
      GTY814522Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  76. REMOVE NO. 2 INSTRUMENT PANEL SPACER 
    1. Detach the claw and remove the 2 No. 2 instrument panel spacers.
      GTY970059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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