ADAPTIVE HIGH BEAM SYSTEM, Diagnostic DTC:B2490, B2491

DTC Code DTC Name
B2490 Left LED Fan Circuit
B2491 Right LED Fan Circuit

DESCRIPTION

If a malfunction is detected in a LED array fan, the headlight light control ECU sub-assembly sends a LED array fan malfunction signal to the headlight ECU sub-assembly via LIN communication. The headlight ECU sub-assembly LH stores DTC B2490 or B2491 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2490 Left LED Fan Circuit LED array fan LH abnormal

  • Headlight unit LH

  • Headlight unit assembly LH (LED array fan LH)

  • Headlight light control ECU sub-assembly LH

 -
B2491 Right LED Fan Circuit LED array fan RH abnormal

  • Headlight unit RH

  • Headlight unit assembly RH (LED array fan RH)

  • Headlight light control ECU sub-assembly RH

 -

WIRING DIAGRAM

B007ZN5E06

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 > AFS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Turn the engine switch on (IG).

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

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2490 and B2491 are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B2490 is output) B
      NG (DTC B2491 is output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    INSPECT HEADLIGHT UNIT RH Click here

    B

  3. INSPECT HEADLIGHT UNIT LH


    1. Remove the headlight assembly LH.

      Click here

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

      Click here

    3. B007ZG5C06
      *a

      Component without harness connected

      (to Headlight Unit Assembly LH (LED Array Fan LH))
      *b

      Component without harness connected

      (to Headlight Light Control ECU Sub-assembly LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K-5 - L-1 Always Below 1 Ω
      K-6 - L-2 Always Below 1 Ω
      K-7 - L-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT LH Click here

    OK

  4. REPLACE HEADLIGHT UNIT ASSEMBLY LH (LED ARRAY FAN LH)


    1. Replace the headlight unit assembly LH (LED array 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 > AFS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Turn the engine switch on (IG).

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

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2490 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY LH (LED ARRAY FAN LH) WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH Click here

  7. INSPECT HEADLIGHT UNIT RH


    1. Remove the headlight assembly RH.

      Click here

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

      Click here

    3. B007ZG5C07
      *a

      Component without harness connected

      (to Headlight Unit Assembly RH (LED Array Fan RH))
      *b

      Component without harness connected

      (to Headlight Light Control ECU Sub-assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K-5 - L-1 Always Below 1 Ω
      K-6 - L-2 Always Below 1 Ω
      K-7 - L-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT RH Click here

    OK

  8. REPLACE HEADLIGHT UNIT ASSEMBLY RH (LED ARRAY FAN RH)


    1. Replace the headlight unit assembly RH (LED array 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 > AFS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK FOR DTC


    1. Turn the engine switch on (IG).

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

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2491 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY RH (LED ARRAY FAN RH) WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH Click here