ADAPTIVE HIGH BEAM SYSTEM, Diagnostic DTC:B2492, B2493

DTC Code DTC Name
B2492 Left Headlight Driver Module Circuit
B2493 Right Headlight Driver Module Circuit

DESCRIPTION

The headlight control ECU sub-assembly receives high beam control signals from the headlight ECU sub-assembly which it uses to control the current and pattern of the LED array via LIN communication. If an abnormal LED array current is detected, the headlight ECU sub-assembly LH B2492 or B2493 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2492 Left Headlight Driver Module Circuit

  • LED array LH abnormal

  • Headlight light control ECU sub-assembly LH abnormal

  • Headlight unit LH

  • Headlight unit assembly LH (LED array LH)

  • Headlight light control ECU sub-assembly LH

 -
B2493 Right Headlight Driver Module Circuit

  • LED array RH abnormal

  • Headlight light control ECU sub-assembly RH abnormal

  • Headlight unit RH

  • Headlight unit assembly RH (LED array RH)

  • Headlight light control ECU sub-assembly RH

 -

WIRING DIAGRAM

B005L3CE01

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 high beam headlights.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2492 and B2493 are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B2492 is output) B
      NG (DTC B2493 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. B005NX3C08
      *a

      Component without harness connected

      (to Headlight Unit Assembly LH (LED Array 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-2 - M-1 Always Below 1 Ω
      K-3 - M-2 Always Below 1 Ω
      K-11 - M-3 Always Below 1 Ω
      K-12 - M-4 Always Below 1 Ω
      K-12 - N-1 Always Below 1 Ω
      K-13 - N-2 Always Below 1 Ω
      K-14 - N-3 Always Below 1 Ω
      K-15 - N-4 Always Below 1 Ω
      K-16 - N-5 Always Below 1 Ω
      K-17 - N-6 Always Below 1 Ω
      K-18 - N-7 Always Below 1 Ω
      K-19 - N-8 Always Below 1 Ω
      K-20 - N-9 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT LH Click here

    OK

  4. REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH


    1. Replace the headlight light control ECU sub-assembly 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 high beam headlights.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2492 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH (LED ARRAY 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. B005NX3C09
      *a

      Component without harness connected

      (to Headlight Unit Assembly RH (LED Array 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-2 - M-1 Always Below 1 Ω
      K-3 - M-2 Always Below 1 Ω
      K-11 - M-3 Always Below 1 Ω
      K-12 - M-4 Always Below 1 Ω
      K-12 - N-1 Always Below 1 Ω
      K-13 - N-2 Always Below 1 Ω
      K-14 - N-3 Always Below 1 Ω
      K-15 - N-4 Always Below 1 Ω
      K-16 - N-5 Always Below 1 Ω
      K-17 - N-6 Always Below 1 Ω
      K-18 - N-7 Always Below 1 Ω
      K-19 - N-8 Always Below 1 Ω
      K-20 - N-9 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT RH Click here

    OK

  8. REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH


    1. Replace the headlight light control ECU sub-assembly 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 high beam headlights.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2493 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH (LED ARRAY RH) Click here