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Home >> Lexus >> 2020 >> LS 500h AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System - Service Information (1 Of 4) >> Front Air Conditioning Unit >> Removal [10/2017 - 09/2018] >> Procedure

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

  3. Check For DTC 
    WARNING:
    • Confirm That DTC P0AA6-49 (Hybrid/Ev Battery Voltage System Isolation Internal Electronic Failure), P1C7C-49 (Hybrid/Ev Battery Voltage System Isolation (A/C Area) Internal Electronic Failure), P1C7D-49 (Hybrid/Ev Battery Voltage System Isolation (Hybrid/Ev Battery Area) Internal Electronic Failure), P1C7E-49 (Hybrid/Ev Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure) Or P1C7F-49 (Hybrid/Ev Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure) Is Not Output Before Removing Or Installing The HV Battery Assembly. If This DTC Is Output, Perform Troubleshooting For This DTC First.
    • To Reduce The Risk Of Electric Shock, Do Not Perform Troubleshooting Before Checking For DTCS.
    GTY588421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Refer To DTC Check / Clear [10/2017 - 10/2023]

  4. Remove V-Bank Cover Sub-Assembly 

    Refer To Procedure - Step 12

  5. Remove Radiator Cover Plate 

    See Step  1

  6. Remove Upper Radiator Support Seal 

    See Step  2

  7. Remove Lower Radiator Air Deflector 

    See Step  3

  8. Remove No. 1 Engine Under Cover Assembly 
    1. For 2WD:

      Refer To Procedure - Step 18

    2. For Awd:

      Refer To Procedure - Step 23

  9. Remove Transmission Under Cover (For 2WD) 

    Refer To Procedure - Step 19

  10. Remove No. 2 Engine Under Cover Assembly 
    1. For 2WD:

      Refer To Procedure - Step 20

    2. For Awd:

      Refer To Procedure - Step 25

  11. Recover Refrigerant From Refrigeration System 

    See Step  4

  12. Drain Engine Coolant 

    Refer To Procedure - Step 8

  13. Align Front Wheels Facing Straight Ahead 
  14. 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 [10/2017 - 10/2020]

    NOTE:

    After Turning The Power Switch Off, Waiting Time May Be Required Before Disconnecting The Cable From The Negative (-) Auxiliary Battery Terminal. Therefore, Make Sure To Read The Disconnecting The Cable From The Negative (-) Auxiliary Battery Terminal Notices Before Proceeding With Work.

    Refer To Precaution [10/2017 - 09/2019]

  15. Remove Luggage Compartment Mat Sub-Assembly 

    Refer To Procedure - Step 24

  16. Remove Front Seat Assembly LH 

    Refer To Removal [10/2017 - 09/2018]

  17. Remove Front Seat Assembly Rh 

    Hint: 

    Use The Same Procedure As For The Front Seat Assembly LH.

  18. Disconnect Cable From Negative Auxiliary Battery Terminal 
    WARNING:
    • Wait At Least 90 Seconds After Disconnecting The Cable From The Negative (-) Auxiliary Battery Terminal To Disable The SRS System.
      GTY581108Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • If The Airbag Deploys For Any Reason, It May Cause A Serious Accident.
    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 Power 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.

      Refer To Removal [10/2017 - 09/2018]

      GTY816277Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect The Cable From The Negative (-) Auxiliary Battery Terminal.

      Refer To Procedure - Step 3

  19. Remove Instrument Panel Safety Pad Sub-Assembly 

    Refer To Removal [10/2017 - 09/2018]

  20. Remove Steering Column Assembly 

    Refer To Removal [10/2017 - 09/2018]

  21. Remove Headup Display (W/ Headup Display) 

    Refer To Procedure - Step 5

  22. Remove Service Plug Grip 

    Refer To Removal [10/2017 - 09/2018]

  23. Remove Front Wiper Motor And Link 

    Refer To Procedure - Step 15

  24. Remove Cowl Ventilator Splash Shield Rh 
    1. Detach The Clip And Guide.
      GTY836087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Detach The Claw And Remove The Cowl Ventilator Splash Shield Rh.
  25. Remove Hole Plug 
    1. Remove The 2 Hole Plugs.
      GTY799686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  26. Remove Fender Apron Brace Sub-Assembly LH 
    1. GTY803359Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Remove The 2 Bolts And Fender Apron Brace Sub-Assembly LH.

  27. Disconnect Suction Tube Sub-Assembly B 
    1. Remove The Bolt.
      GTY799627Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Rotate The 1-Point Tightening Plate In The Direction Of The Arrow Shown In The Illustration And Disconnect The Suction Tube Sub-Assembly B.
      GTY828118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Rotate In This Direction
      NOTE:

      Do Not Apply Excessive Force To The Suction Tube Sub-Assembly B.

    3. Remove The O-Ring From The Suction Tube Sub-Assembly B.
      NOTE:

      Seal The Openings Of The Disconnected Parts Using Vinyl Tape To Prevent The Entry Of Moisture And Foreign Matter.

  28. Disconnect Cooler Refrigerant Liquid Pipe A 
    1. Disconnect The Cooler Refrigerant Liquid Pipe A.
      GTY799628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Do Not Apply Excessive Force To The Cooler Refrigerant Liquid Pipe A.

    2. Remove The O-Ring From The Cooler Refrigerant Liquid Pipe A.
      NOTE:

      Seal The Openings Of The Disconnected Parts Using Vinyl Tape To Prevent The Entry Of Moisture And Foreign Matter.

  29. Remove Cooler Pipe Grommet 
    1. Remove The Cooler Pipe Grommet.
      GTY799606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  30. Remove Inverter Cover Assembly Rh 

    Refer To Procedure - Step 9

  31. Check Terminal Voltage 
    1. Remove The Connector Cover Assembly.

      Refer To Procedure - Step 12

    2. Check The Terminal Voltage.

      Refer To Procedure - Step 13

    3. Install The Connector Cover Assembly.

      Refer To Procedure - Step 15

  32. Remove Inverter Terminal Cover 

    Refer To Procedure - Step 15

  33. Disconnect Generator Cable 

    Refer To Procedure - Step 16

  34. Disconnect Motor Cable 

    Refer To Procedure - Step 17

  35. Remove Inverter Motor Cable Bracket Assembly 

    Refer To Procedure - Step 18

  36. Remove Fender Apron Brace Sub-Assembly Rh 

    Refer To Procedure - Step 19

  37. Disconnect Outlet Heater Water Hose 
    1. Detach The Clamp.
      GTY799625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using Pliers, Grip The Claws Of The Hose Clips And Slide The Hose Clip To Disconnect 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.
      GTY790104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A For 2Wd
      *B For Awd
  38. Disconnect Inlet Heater Water Hose 
    1. Using Pliers, Grip The Claws Of The Hose Clips And Slide The Hose Clip To Disconnect 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.
      GTY834818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A For 2Wd
      *B For Awd
  39. Remove Outlet Heater Water Hose 
    1. Using Pliers, Grip The Claws Of The Hose Clips And Slide The Hose Clip To Remove The Outlet Heater Water Hose.
      GTY784026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A For 2Wd
      *B For Awd
      NOTE:
      • Do Not Apply Excessive Force To The Outlet Heater Water Hose.
      • Prepare A Drain Pan Or Cloth In Case The Coolant Leaks.
  40. Remove Inlet Heater Water Hose 
    1. Using Pliers, Grip The Claws Of The Hose Clips And Slide The Hose Clip To Remove The Inlet Heater Water Hose.
      GTY775696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A For 2Wd
      *B For Awd
      NOTE:
      • Do Not Apply Excessive Force To The Inlet Heater Water Hose.
      • Prepare A Drain Pan Or Cloth In Case The Coolant Leaks.
  41. Remove Heater Pipe Grommet 
    1. Remove The Heater Pipe Grommet.
      GTY799609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  42. Remove Rear Door Scuff Plate LH 

    Refer To Procedure - Step 15

  43. Remove Lower Center Pillar Garnish LH 

    Refer To Procedure - Step 19

  44. Remove Rear Door Scuff Plate Rh 

    Hint: 

    Use The Same Procedure Described For The Rear Door Scuff Plate LH.

  45. Remove Lower Center Pillar Garnish Rh 

    Hint: 

    Use The Same Procedure Described For The Lower Center Pillar Garnish LH.

  46. Remove Accelerator Pedal 

    Refer To Procedure - Step 2

  47. 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
  48. 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.

  49. 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 Both Rear No. 3 Air Ducts.

  50. 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 Each Fastener.
    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.
      Fig 1: Front Floor Front Carpet Assembly Removal Sequence
      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.
  51. 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
  52. 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
  53. Remove Front Floor Mat LH 
    1. Remove The Front Floor Mat LH.
      GTY798527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A For 2Wd *B For Awd
  54. Remove Rear Air Duct Guide Rh 

    Hint: 

    Use The Same Procedure As For The Rear Air Duct Guide LH.

  55. 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
  56. 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
  57. Remove No. 2 Air Duct Sub-Assembly 
    1. Using A Clip Remover, Remove The Clip And The No. 2 Air Duct Sub-Assembly.
      GTY791297Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Remove In This Direction
  58. Remove Instrument Panel Wire 
    1. Disconnect The Connector And Detach The Clamp.
      GTY815288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect The Connector.
      GTY832634Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Detach The Clamp.
  59. Remove Semiconductor Power Integration ECU (W/ PTC Heater) 

    Refer To Procedure - Step 6

  60. Remove Semiconductor Power Integration ECU (W/O PTC Heater) 

    Hint: 

    Use The Same Procedure As For The Semiconductor Power Integration ECU (W/ PTC Heater).

  61. Remove Shift Control ECU 
    1. For 2WD:

      Refer To Procedure - Step 7

    2. For Awd:

      Refer To Procedure - Step 7

  62. Remove Hybrid Vehicle Control ECU Assembly 

    Refer To Procedure - Step 10

  63. Remove Front Steering Control ECU (W/ Vgrs) 

    Refer To Procedure - Step 10

  64. Remove Passenger Side Junction Block Assembly With Network Gateway ECU 

    Refer To Procedure - Step 8

  65. Remove Wiring Harness Clamp Bracket 
    1. Remove The Screw And Wiring Harness Clamp Bracket.
      GTY815287Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  66. 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.
  67. 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.
  68. Remove Instrument Panel Wire 
    1. Disconnect The 2 Connectors.
      GTY799669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Detach The Clamp.
  69. 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.
  70. Remove Certification ECU (Smart Key ECU Assembly) 

    Refer To Procedure - Step 11

  71. Remove Instrument Panel Junction Block Assembly With Main Body ECU 

    Refer To Procedure - Step 6

  72. Remove Air Conditioning Amplifier Assembly 

    Refer To Procedure - Step 2

  73. Remove Instrument Panel Wire 
    1. Disconnect The 4 Connectors.
      GTY799667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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.

  74. 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
  75. 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.
  76. 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.
  77. 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.
  78. 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).
      GTY795547Courtesy 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.
      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.

      GTY806447Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      After Detaching From The Lift Up Guide, Pull It Towards You To Remove It From The Vehicle - -
  79. Remove Lower Defroster Nozzle Assembly 
    1. Detach The Claw And Remove The Lower Defroster Nozzle Assembly.
      GTY799634Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  80. Remove Id Code Box (Immobiliser Code ECU) 

    Refer To Procedure - Step 5

  81. Remove Air Conditioner Unit Assembly 
    1. Detach The Clamp.
      GTY781646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove The 3 Bolts.
      GTY798511Courtesy 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.)

  82. Remove No. 1 Instrument Panel Spacer 
    1. Detach The Claw And Remove The No. 1 Instrument Panel Spacer.
      GTY814522Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  83. 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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