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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 219 (Heating / Air Conditioning System (Except Hybrid) - Diagnostic Codes & Symptom Tests) >> AIR CONDITIONING SYSTEM (for Gasoline Model) >> Air Conditioning Compressor Magnetic Clutch Circuit [06/2018 - ] >> Procedure

Air Conditioning Compressor Magnetic Clutch Circuit [06/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 250, 2023 Lexus ES 350, 2023 Lexus ES 250, and 2022 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT MG CLT RELAY 
    1. Inspect the MG CLT relay.

      Refer to ON-VEHICLE INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE MG CLT RELAY 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (MG CLT RELAY - POWER SOURCE) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      3 (MG CLT relay) - Body ground Always 11 to 14 V
      1 (MG CLT relay) - Body ground Engine switch off Below 1 V
      1 (MG CLT relay) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (MG CLT RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G40 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (MG CLT relay) - G40-9 (MGC) Always Below 1 Ω
      2 (MG CLT relay) or G40-9 (MGC) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (MG CLT RELAY - MAGNET CLUTCH ASSEMBLY AND BODY GROUND) 
    1. Disconnect the C36 magnet clutch assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (MG CLT relay) - C36-3 (MG+) Always Below 1 Ω
      5 (MG CLT relay) or C36-3 (MG+) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH ASSEMBLY - BODY GROUND) 
    1. Install the MG CLT relay.
    2. Connect the C36 magnet clutch assembly connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C36-3 (MG+) - Body ground Engine running
      (A/C switch: Off)      		 Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAGNET CLUTCH ASSEMBLY. Refer to  DISASSEMBLY [06/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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