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Home >> Lexus >> 2021 >> LS 500 Base, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (Ext) - Diagnostic Codes (2 Of 3) >> Lighting System >> DTC B243D-29: Low Beam Fan LH Signal Invalid; DTC B243E-29: Low Beam Fan RH Signal Invalid [10/2023 - ] >> Procedure

DTC B243D-29: Low Beam Fan LH Signal Invalid; DTC B243E-29: Low Beam Fan RH Signal Invalid [10/2023 - ]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Headlight Control > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 

    Pre-procedure1

    1. Turn ignition switch to ON.
    2. Operate the light control switch to turn on the low beam headlights and wait 120 seconds or more.

      Procedure1

    3. Check for DTCs.

      Body Electrical > Headlight Control > Trouble Codes 

      Result

      Result Proceed to
      B243D-29 is not output A
      B243D-29 is output B

      Post-procedure1

    4. None

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  3

  3. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Headlight Control (Sub) > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK FOR DTC 

    Pre-procedure1

    1. Turn ignition switch to ON.
    2. Operate the light control switch to turn on the low beam headlights and wait 120 seconds or more.

      Procedure1

    3. Check for DTCs.

      Body Electrical > Headlight Control (Sub) > Trouble Codes 

      Result

      Result Proceed to
      B243E-29 is not output A
      B243E-29 is output B

      Post-procedure1

    4. None

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

    Result: 

    B 

    See step  5

  5. CHECK HEADLIGHT UNIT ASSEMBLY RH 
    1. Interchange the headlight unit assembly RH with LH and connect the connectors.

      HINT: 

      Refer to DISASSEMBLY [10/2020 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Headlight Control (Sub) > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. CHECK FOR DTC 

    Pre-procedure1

    1. Turn ignition switch to ON.
    2. Operate the light control switch to turn on the low beam headlights and wait 120 seconds or more.

      Procedure1

    3. Check for DTCs.

      Body Electrical > Headlight Control (Sub) > Trouble Codes 

      Result

      Result Proceed to
      B243E-29 is not output A
      B243E-29 is output B

      Post-procedure1

    4. None

    Result: 

    A 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [10/2020 - ] 

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [10/2020 - ] 

  8. CHECK HEADLIGHT UNIT ASSEMBLY LH 
    1. Interchange the headlight unit assembly LH with RH and connect the connectors.

      HINT: 

      Refer to DISASSEMBLY [10/2020 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Headlight Control > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. CHECK FOR DTC 

    Pre-procedure1

    1. Turn ignition switch to ON.
    2. Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.

      Procedure1

    3. Check for DTCs.

      Body Electrical > Headlight Control > Trouble Codes 

      Result

      Result Proceed to
      B243D-29 is output A
      B243D-29 is not output B

      Post-procedure1

    4. None

    Result: 

    A 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [10/2020 - ] 

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  REMOVAL [10/2020 - ] 

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