DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ AFS) - Diagnostic Codes (2 Of 2), Symptom Tests & Circuit Tests >> LIGHTING SYSTEM (w/ AFS) >> High Beam Headlight Circuit [12/2019 - 11/2023] >> Procedure

High Beam Headlight Circuit [12/2019 - 11/2023]: Procedure

  1. CHECK LIGHTS 
    1. Check the illumination of each high beam light.

      Result

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

    Result: 

    See step  5

    Result: 

    See step  2

  2. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      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 headlights turn on.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 10/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2022 - 11/2023] 

    Result: 

    NG 

    See step  3

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

      Refer to DISASSEMBLY [12/2019 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. 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 [12/2019 - 11/2023] 

    Result: 

    NG 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 11/2023] 

  5. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      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 headlights turn on.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 10/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2022 - 11/2023] 

    Result: 

    NG 

    See step  6

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

      Refer to DISASSEMBLY [12/2019 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. 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 [12/2019 - 11/2023] 

    Result: 

    NG 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 11/2023]