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Home >> Lexus >> 2021 >> UX 200 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Exterior) (Diagnostic Codes (2 Of 2) & Circuit Tests) >> Lighting System >> High Beam Headlight Circuit [10/2018 - 07/2022] >> Procedure

High Beam Headlight Circuit [10/2018 - 07/2022]: Procedure

  1. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for Triple Beam Headlight A
      for Single Beam Headlight with Automatic Headlight Beam Level Control System B
      for Single Beam Headlight without Automatic Headlight Beam Level Control System C

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  12

    Result: 

    A 

    See step  2

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

      Result

      Result Proceed to
      Left side high beam light does not illuminate A
      Right 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 ignition switch to ON.
    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 High beam headlights 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 [10/2018 - 10/2019]  Refer to  PROBLEM SYMPTOMS TABLE [10/2019 - 10/2020]  Refer to  PROBLEM SYMPTOMS TABLE [10/2020 - 07/2022] 

    Result: 

    NG 

    See step  7

  4. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    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 High beam headlights 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 [10/2018 - 10/2019]  Refer to  PROBLEM SYMPTOMS TABLE [10/2019 - 10/2020]  Refer to  PROBLEM SYMPTOMS TABLE [10/2020 - 07/2022] 

    Result: 

    NG 

    See step  10

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

      Result

      Result Proceed to
      Left side high beam light does not illuminate A
      Right side high beam light does not illuminate B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  6

  6. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    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 High beam headlights OFF or ON -

      Body Electrical > HL AutoLeveling > 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 [10/2018 - 10/2019]  Refer to  PROBLEM SYMPTOMS TABLE [10/2019 - 10/2020]  Refer to  PROBLEM SYMPTOMS TABLE [10/2020 - 07/2022] 

    Result: 

    NG 

    See step  7

  7. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH 
    1. Interchange the No. 1 headlight ECU sub-assembly LH with RH and connect the connectors.

      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

      Result  Proceed to
      OK A
      NG (for Triple Beam Headlight) B
      NG (for Single Beam Headlight) C

    Result: 

    A 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    B 

    REPLACE HEADLIGHT UNIT LH. Refer to  DISASSEMBLY [10/2018 - ] 

    Result: 

    C 

    REPLACE HEADLIGHT UNIT LH. Refer to  DISASSEMBLY [10/2018 - ] 

  9. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    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 High beam headlights OFF or ON -

      Body Electrical > HL AutoLeveling (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 [10/2018 - 10/2019]  Refer to  PROBLEM SYMPTOMS TABLE [10/2019 - 10/2020]  Refer to  PROBLEM SYMPTOMS TABLE [10/2020 - 07/2022] 

    Result: 

    NG 

    See step  10

  10. CHECK HEADLIGHT UNIT RH 
    1. Interchange the headlight unit RH with LH and connect the connectors.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

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

      OK

      High beam headlight operates normally.

      Result

      Result  Proceed to
      OK A
      NG (for Triple Beam Headlight) B
      NG (for Single Beam Headlight) C

    Result: 

    A 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    B 

    REPLACE HEADLIGHT UNIT RH. Refer to  DISASSEMBLY [10/2018 - ] 

    Result: 

    C 

    REPLACE HEADLIGHT UNIT RH. Refer to  DISASSEMBLY [10/2018 - ] 

  12. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Active Test
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Head Light Hi High beam headlights ON/OFF -

      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 [10/2018 - 10/2019]  Refer to  PROBLEM SYMPTOMS TABLE [10/2019 - 10/2020]  Refer to  PROBLEM SYMPTOMS TABLE [10/2020 - 07/2022] 

    Result: 

    NG 

    See step  13

  13. INSPECT H-LP SHADE RELAY 
    1. Remove the H-LP SHADE relay from the No. 2 engine room relay block.
    2. Inspect the H-LP SHADE relay.

      Refer to ON-VEHICLE INSPECTION [10/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE H-LP SHADE RELAY 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (H-LP SHADE RELAY - AUXILIARY BATTERY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR HV MODEL

      Tester Connection Switch Condition Specified Condition
      Relay terminal 1 - Body ground Ignition switch off 11 to 14 V
      Relay terminal 3 - Body ground Ignition switch off 11 to 14 V
      FOR GASOLINE MODEL

      Tester Connection Condition Specified Condition
      Relay terminal 1 - Body ground Always 11 to 14 V
      Relay terminal 3 - Body ground Always 11 to 14 V
      GTY783331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Engine Room Relay Block
      *a H-LP SHADE Relay Holder Terminal

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (H-LP SHADE RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH AND BODY GROUND) 
    1. Disconnect the A17 headlight assembly LH connector.
    2. Disconnect the A18 headlight assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay terminal 5 - Headlight Assembly LH A17-1 (SOL) Always Below 1 Ω
      Relay terminal 5 - Headlight Assembly RH A18-1 (SOL) Always Below 1 Ω
      A17-6 (E) - Body ground Always Below 1 Ω
      A18-6 (E) - Body ground Always Below 1 Ω
      Relay terminal 5 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (H-LP SHADE RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the F40 main body ECU (Multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay terminal 2 - F40-13 (DIM) Always Below 1 Ω
      Relay terminal 2- Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2018 - 07/2022] 

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