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Home >> Lexus >> 2024 >> RC 350 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Lighting System (Triple Beam Headlight) - Diagnostic Codes & Circuit Tests) >> LIGHTING SYSTEM (for Triple Beam Headlight) >> DTC B2439: Headlamp LH Circuit; DTC B243A: Headlamp RH Circuit [09/2014 - 10/2018] >> Procedure

DTC B2439: Headlamp LH Circuit; DTC B243A: Headlamp RH Circuit [09/2014 - 10/2018]: Procedure

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  1. CLEAR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 10/2018]

      Body Electrical > HL AutoLeveling > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Turn the engine switch on (IG).
    2. Operate the light control switch to turn on the low beam headlights and then turn on the high beam headlights.
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 10/2018]

      Body Electrical > HL AutoLeveling > Trouble Codes 

      OK

      DTC B2439 and B243A are not output.

      Result

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

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 10/2018] 

    Result: 

    C 

    See step  6

    Result: 

    B 

    See step  3

  3. REPLACE HEADLIGHT UNIT ASSEMBLY LH 
    1. Replace the headlight unit assembly LH with a new or known good one.

      Refer to DISASSEMBLY [09/2014 - 10/2018]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CLEAR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 10/2018]

      Body Electrical > HL AutoLeveling > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK FOR DTC 
    1. Turn the engine switch on (IG).
    2. Operate the light control switch to turn on the low beam headlights and then turn on the high beam headlights.
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 10/2018]

      Body Electrical > HL AutoLeveling > Trouble Codes 

      OK

      DTC B2439 is not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2014 - 10/2018] 

  6. REPLACE HEADLIGHT UNIT ASSEMBLY RH 
    1. Replace the headlight unit assembly RH with a new or known good one.

      Refer to DISASSEMBLY [09/2014 - 10/2018]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. CLEAR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 10/2018]

      Body Electrical > HL AutoLeveling > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK FOR DTC 
    1. Turn the engine switch on (IG).
    2. Operate the light control switch to turn on the low beam headlights and then turn on the high beam headlights.
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 10/2018]

      Body Electrical > HL AutoLeveling > Trouble Codes 

      OK

      DTC B243A is not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [09/2014 - 10/2018] 

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