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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ AFS) - Diagnostic Codes (1 Of 2) >> LIGHTING SYSTEM (w/ AFS) >> DTC B2439-00: Headlight Source LH Malfunction; DTC B243A-00: Headlight Source RH Malfunction [11/2023 - ] >> Procedure

DTC B2439-00: Headlight Source LH Malfunction; DTC B243A-00: Headlight Source RH Malfunction [11/2023 - ]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Headlight Control > Clear DTCs 

      Body Electrical > Headlight Control (Sub) > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.
    3. Check for DTCs.

      Body Electrical > Headlight Control > Trouble Codes 

      Body Electrical > Headlight Control (Sub) > Trouble Codes 

      OK

      DTC B2439-00 and B243A-00 are not output.

      Result

      Result Proceed to
      OK A
      NG (DTC B2439-00 is output) B
      NG (DTC B243A-00 is output) C

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    C 

    See step  6

    Result: 

    B 

    See step  3

  3. CHECK HEADLIGHT ASSEMBLY LH 
    1. 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. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Headlight Control > Clear DTCs 

      Body Electrical > Headlight Control (Sub) > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.
    3. Check for DTCs.

      Body Electrical > Headlight Control > Trouble Codes 

      Body Electrical > Headlight Control (Sub) > Trouble Codes 

      Result

      Result Proceed to
      DTC B2439-00 is output A
      DTC B243A-00 is output B

    Result: 

    A 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  DISASSEMBLY [12/2019 - ] 

  6. CHECK HEADLIGHT ASSEMBLY RH 
    1. 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. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Headlight Control > Clear DTCs 

      Body Electrical > Headlight Control (Sub) > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.
    3. Check for DTCs.

      Body Electrical > Headlight Control > Trouble Codes 

      Body Electrical > Headlight Control (Sub) > Trouble Codes 

      Result

      Result Proceed to
      DTC B243A-00 is output A
      DTC B2439-00 is output B

    Result: 

    A 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  DISASSEMBLY [12/2019 - ] 

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