LIGHTING SYSTEM(for Triple Beam Headlight), Diagnostic DTC:B243D, B243E

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

DESCRIPTION

A DTC is stored when a malfunction of the headlight fan occurs and the low beam headlight is dim. The headlight ECU sub-assembly LH stores DTC B243D and B243E.

DTC No. Detection Item DTC Detection Condition Trouble Area
B243D Left Low Beam Fan Malfunction Malfunction of headlight fan occurs and low beam headlight is dim

  • Headlight unit assembly LH

  • Headlight fan LH

  • Headlight ECU sub-assembly LH
B243E Right Low Beam Fan Malfunction Malfunction of headlight fan occurs and low beam headlight is dim

  • Headlight unit assembly RH

  • Headlight fan RH

  • Headlight ECU sub-assembly RH

WIRING DIAGRAM

B004GT2E09
Headlight Assembly Internal Circuit
*a Headlight Fan
*b Headlight ECU Sub-assembly
*c Headlight Unit 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. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Turn the power switch on (IG).

    2. Operate the light control switch to turn on the low beam headlights and wait 2 minutes.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > 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

    INSPECT HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  3. INSPECT HEADLIGHT UNIT ASSEMBLY LH


    1. Remove the headlight assembly LH.

      Click here

    2. Remove the headlight unit LH from the headlight assembly LH.

      Click here

    3. Disconnect the headlight fan LH connector.

    4. Measure the resistance according to the value(s) in the table below.

      B004F7OC01
      *a

      Component without harness connected

      (Headlight Unit Assembly LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      G-1 - F-14 Always Below 1 Ω
      G-2 - F-15 Always Below 1 Ω
      G-3 - F-6 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  4. REPLACE HEADLIGHT FAN LH


    1. Replace the headlight fan LH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Turn the power switch on (IG).

    2. Operate the light control switch to turn on the low beam headlights and wait 2 minutes.

    3. Check for DTCs.

      Click here


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

    OK

    END (HEADLIGHT FAN LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  7. INSPECT HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the headlight assembly RH.

      Click here

    2. Remove the headlight unit RH from the headlight assembly RH.

      Click here

    3. Disconnect the headlight fan RH connector.

    4. Measure the resistance according to the value(s) in the table below.

      B004GHYC01
      *a

      Component without harness connected

      (Headlight Unit Assembly RH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      G-1 - F-14 Always Below 1 Ω
      G-2 - F-15 Always Below 1 Ω
      G-3 - F-6 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  8. REPLACE HEADLIGHT FAN RH


    1. Replace the headlight fan RH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK FOR DTC


    1. Turn the power switch on (IG).

    2. Operate the light control switch to turn on the low beam headlights and wait 2 minutes.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      OK
      DTC B243E is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT FAN RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here