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Home >> Lexus >> 2021 >> ES 350 Luxury >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Ext) (Except Hybrid) - Symptom Tests & Circuit Tests >> LIGHTING SYSTEM (for Gasoline Model) >> Front Side Marker Light Circuit [06/2018 - 08/2021] >> Procedure

Front Side Marker Light Circuit [06/2018 - 08/2021]: Procedure

  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 front side marker lights.

      Result

      Result Proceed to
      LH side front side marker light does not illuminate A
      RH side front side marker 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 engine 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
      Clearance Light Parking lights OFF or ON -

      Body Electrical > AFS > Active Test 

      Tester Display
      Clearance Light

      OK

      Front side marker light illuminate.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 08/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2020 - 08/2021] 

    Result: 

    NG 

    See step  9

  4. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine 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
      Clearance Light Parking lights OFF or ON -

      Body Electrical > AFS (Sub) > Active Test 

      Tester Display
      Clearance Light

      OK

      Front side marker light illuminate.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 08/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2020 - 08/2021] 

    Result: 

    NG 

    See step  16

  5. CHECK LIGHTS 
    1. Check the illumination of each front side marker lights.

      Result

      Result Proceed to
      LH side front side marker light does not illuminate A
      RH side front side marker light does not illuminate B

    Result: 

    B 

    See step  13

    Result: 

    A 

    See step  6

  6. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine 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
      Clearance Light Parking lights OFF or ON -

      Body Electrical > HL AutoLeveling > Active Test 

      Tester Display
      Clearance Light

      OK

      Front side marker light illuminate.

      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 - 08/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2020 - 08/2021] 

    Result: 

    C 

    See step  11

    Result: 

    B 

    See step  7

  7. CHECK HEADLIGHT CORD LH 
    1. Interchange the headlight cord LH with RH and connect the connectors.

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK OPERATION (FRONT SIDE MARKER LIGHT) 
    1. Check that the front side marker light operates normally.

      OK

      Front side marker light operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT CORD LH. Refer to  DISASSEMBLY [06/2018 - 08/2021] 

    Result: 

    OK 

    See step  9

  9. 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  10

  10. CHECK OPERATION (FRONT SIDE MARKER LIGHT) 
    1. Check that the front side marker light operates normally.

      OK

      Front side marker light 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]

  11. 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  12

  12. CHECK OPERATION (FRONT SIDE MARKER LIGHT) 
    1. Check that the front side marker light operates normally.

      OK

      Front side marker light 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] 

  13. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine 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
      Clearance Light Parking lights OFF or ON -

      Body Electrical > HL AutoLeveling (Sub) > Active Test 

      Tester Display
      Clearance Light

      OK

      Front side marker light illuminate.

      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 - 08/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2020 - 08/2021] 

    Result: 

    C 

    See step  18

    Result: 

    B 

    See step  14

  14. CHECK HEADLIGHT CORD RH 
    1. Interchange the headlight cord RH with LH and connect the connectors.

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  15

  15. CHECK OPERATION (FRONT SIDE MARKER LIGHT) 
    1. Check that the front side marker light operates normally.

      OK

      Front side marker light operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT CORD RH. Refer to  DISASSEMBLY [06/2018 - 08/2021] 

    Result: 

    OK 

    See step  16

  16. 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  17

  17. CHECK OPERATION (FRONT SIDE MARKER LIGHT) 
    1. Check that the front side marker light operates normally.

      OK

      Front side marker light 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]

  18. 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  19

  19. CHECK OPERATION (FRONT SIDE MARKER LIGHT) 
    1. Check that the front side marker light operates normally.

      OK

      Front side marker light 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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