LIGHTING SYSTEM, Diagnostic DTC:B243D, B243E

DTC Code DTC Name
B243D Left Low Beam Fan Malfunction
B243E Right Low Beam Fan Malfunction

DESCRIPTION

The headlight ECU sub-assembly operates the low beam fan to cool the headlight LED unit in order to prevent the headlight LED unit from overheating.

Illuminates the low beam headlights and continuously operates the low beam fan.

The headlight ECU sub-assembly monitors the pulse signals from the FANP terminal when the low beam fans are operating.

Tech Tips

If B243D or B243E is output, the headlight ECU sub-assembly performs low beam headlight dimming control.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
B243D Left Low Beam Fan Malfunction

    Detection condition:

  • Power switch on (IG), low beam headlights illuminated


    Malfunction status:

  • Fan speed signals from the low beam fan of less than 1600 rpm are continuously detected


    Malfunction duration:

  • 120 seconds or longer

  • Headlight unit assembly LH

  • Lo beam fan

  • Headlight ECU sub-assembly LH

 Headlight ECU sub-assembly LH -
B243E Right Low Beam Fan Malfunction

    Detection condition:

  • Power switch on (IG), low beam headlights illuminated


    Malfunction status:

  • Fan speed signals from the low beam fan of less than 1600 rpm are continuously detected


    Malfunction duration:

  • 120 seconds or longer

  • Headlight unit assembly RH

  • Lo beam fan

  • Headlight ECU sub-assembly RH

 Headlight ECU sub-assembly RH -

WIRING DIAGRAM

B004Y48E05
*a Lo Beam Fan
*b Headlight Unit Assembly
*c Headlight ECU Sub-assembly

CAUTION / NOTICE / HINT

Note

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs
      Body Electrical > AFS (Sub) > Clear DTCs

    2. 120 seconds elapse after turning the power switch on (IG) and illuminating the low beam headlights using the light control switch.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      Body Electrical > AFS (Sub) > Trouble Codes
      OK
      DTC B243D and B243E are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B243D is output) B
      NG (DTC B243E is output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  2. CHECK HEADLIGHT UNIT ASSEMBLY LH


    1. Interchange the headlight unit assembly LH with RH and connect the connectors to them.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

    3. 120 seconds elapse after turning the power switch on (IG) and illuminating the low beam headlights using the light control switch.

    4. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B243D is not output.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS AND LO BEAM FAN) Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  3. CHECK HEADLIGHT UNIT ASSEMBLY RH


    1. Interchange the headlight unit assembly RH with LH and connect the connectors to them.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > AFS (Sub) > Clear DTCs

    3. 120 seconds elapse after turning the power switch on (IG) and illuminating the low beam headlights using the light control switch.

    4. Check for DTCs.

      Click here


      Body Electrical > AFS (Sub) > Trouble Codes
      OK
      DTC B243E is not output.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS AND LO BEAM FAN) Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here