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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 197 (Lighting System (Ext) (Hybrid) - Symptom Tests (2 Of 2) & Circuit Tests) >> LIGHTING SYSTEM (for HV Model) >> High Beam Headlight Circuit [06/2018 - 08/2021] >> Procedure

High Beam Headlight Circuit [06/2018 - 08/2021]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK LIGHTS 
    1. Check the illumination of each high beam lights.

      Result

      Result Proceed to
      LH side high beam light does not illuminate A
      RH side high beam light does not illuminate B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  3

  3. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > AFS > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Headlight High Beam Left high beam headlight OFF or ON -

      Body Electrical > AFS > Active Test 

      Tester Display
      Headlight High Beam

      OK

      High beam headlight turn on.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 08/2021] 

    Result: 

    NG 

    See step  7

  4. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS (Sub) / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > AFS (Sub) > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Headlight High Beam Right high beam headlight OFF or ON -

      Body Electrical > AFS (Sub) > Active Test 

      Tester Display
      Headlight High Beam

      OK

      High beam headlight turn on.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 08/2021] 

    Result: 

    NG 

    See step  12

  5. CHECK LIGHTS 
    1. Check the illumination of each high beam lights.

      Result

      Result Proceed to
      LH side high beam light does not illuminate A
      RH side high beam light does not illuminate B

    Result: 

    B 

    See step  11

    Result: 

    A 

    See step  6

  6. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / HL AutoLeveling / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > HL AutoLeveling > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Headlight High Beam Left high beam headlight OFF or ON -

      Body Electrical > HL AutoLeveling > Active Test 

      Tester Display
      Headlight High Beam

      OK

      High beam headlight turn on.

      Result

      Result Proceed to
      OK A
      NG (for TMC Made) B
      NG (for TMMK Made) C

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 08/2021] 

    Result: 

    C 

    See step  9

    Result: 

    B 

    See step  7

  7. CHECK HEADLIGHT UNIT ASSEMBLY LH 
    1. Interchange the headlight unit assembly LH with RH and connect the connectors.

      for LED Type Turn Signal Light: Refer to DISASSEMBLY [06/2018 - 08/2021]

      for Bulb Type Turn Signal Light: Refer to DISASSEMBLY [06/2018 - 08/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK OPERATION (HIGH BEAM HEADLIGHT) 
    1. Check that the high beam headlight operates normally.

      OK

      High beam headlight operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2018 - 09/2022] 

    Result: 

    NG 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH 

    for LED Type Turn Signal Light: Refer to DISASSEMBLY [06/2018 - 08/2021]

    for Bulb Type Turn Signal Light: Refer to DISASSEMBLY [06/2018 - 08/2021]

  9. CHECK HEADLIGHT ASSEMBLY LH 
    1. Remove each headlight ECU sub-assembly, interchange the headlight assembly LH with RH and connect the connectors.

      Refer to REMOVAL [06/2018 - 08/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. CHECK OPERATION (HIGH BEAM HEADLIGHT) 
    1. Check that the high beam headlight operates normally.

      OK

      High beam headlight operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2018 - 09/2022] 

    Result: 

    NG 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [06/2018 - 08/2021] 

  11. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / HL AutoLeveling (Sub) / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > HL AutoLeveling (Sub) > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Headlight High Beam Right high beam headlight OFF or ON -

      Body Electrical > HL AutoLeveling (Sub) > Active Test 

      Tester Display
      Headlight High Beam

      OK

      High beam headlight turn on.

      Result

      Result Proceed to
      OK A
      NG (for TMC Made) B
      NG (for TMMK Made) C

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 08/2021] 

    Result: 

    C 

    See step  14

    Result: 

    B 

    See step  12

  12. CHECK HEADLIGHT UNIT ASSEMBLY RH 
    1. Interchange the headlight unit assembly RH with LH and connect the connectors.

      for LED Type Turn Signal Light: Refer to DISASSEMBLY [06/2018 - 08/2021]

      for Bulb Type Turn Signal Light: Refer to DISASSEMBLY [06/2018 - 08/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  13

  13. CHECK OPERATION (HIGH BEAM HEADLIGHT) 
    1. Check that the high beam headlight operates normally.

      OK

      High beam headlight operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [06/2018 - 09/2022] 

    Result: 

    NG 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH 

    for LED Type Turn Signal Light: Refer to DISASSEMBLY [06/2018 - 08/2021]

    for Bulb Type Turn Signal Light: Refer to DISASSEMBLY [06/2018 - 08/2021]

  14. CHECK HEADLIGHT ASSEMBLY RH 
    1. Remove each headlight ECU sub-assembly, interchange the headlight assembly RH with LH and connect the connectors.

      Refer to REMOVAL [06/2018 - 08/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  15

  15. CHECK OPERATION (HIGH BEAM HEADLIGHT) 
    1. Check that the high beam headlight operates normally.

      OK

      High beam headlight operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [06/2018 - 09/2022] 

    Result: 

    NG 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [06/2018 - 08/2021] 

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