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 ECU sub-assembly sends control signals to the light control LED ECU via LIN communication and controls the additional LEDs using the drive circuit inside the light control LED ECU.

The light control LED ECU applies voltage, which is boosted inside the light control LED ECU to maintain the current applied to the additional LEDs at a constant level, to the additional LEDs and turns on/off each LED based on adaptive high beam system control.

The light control LED ECU also monitors the applied voltage value to detect current application malfunctions.

The light control LED ECU also detects malfunctions in the switching circuit that performs the adaptive high beam system illumination pattern inside the light control LED ECU.

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

    Detection Condition:

  • Power switch is on (IG) and high beam headlight is illuminated


    Malfunction Status:

  • Adaptive high beam system circuit malfunction signals are received from light control LED ECU LH


    • Additional LED malfunction

    • Light control LED ECU LH malfunction

    • Open or short in adaptive high beam system

  • Headlight unit LH

  • Headlight unit assembly LH

  • Light control LED ECU LH
B2493 Right Headlight Driver Module Circuit

    Detection Condition:

  • Power switch is on (IG) and high beam headlight is illuminated


    Malfunction Status:

  • Adaptive high beam system circuit malfunction signals are received from light control LED ECU RH


    • Additional LED malfunction

    • Light control LED ECU RH malfunction

    • Open or short in adaptive high beam system

  • Headlight unit RH

  • Headlight unit assembly RH

  • Light control LED ECU RH

WIRING DIAGRAM

Figure 1. for LH Side:

B002K8ZE03

Figure 2. for RH Side:

B002K8ZE05

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

    2. Turn the power switch on (IG).

    3. Operate the light control switch to turn on the high beam headlights.

    4. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2492 or 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 ASSEMBLY RH Click here

    B

  2. INSPECT HEADLIGHT UNIT ASSEMBLY LH


    1. Remove the headlight unit LH.

      Click here

      B002H19C01
      *a

      Component without harness connected

      (Light Control LED ECU LH)

      		 *b

      Component without harness connected

      (Headlight Unit LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F-14 - H-22 Always Below 1 Ω
      F-5 - H-11 Always Below 1 Ω
      F-13 - H-21 Always Below 1 Ω
      F-4 - H-10 Always Below 1 Ω
      F-12 - H-20 Always Below 1 Ω
      F-3 - H-9 Always Below 1 Ω
      F-11 - H-19 Always Below 1 Ω
      F-2 - H-3 Always Below 1 Ω
      F-10 - H-18 Always Below 1 Ω
      F-1 - H-7 Always Below 1 Ω
      F-9 - H-17 Always Below 1 Ω
      G-10 - H-6 Always Below 1 Ω
      G-14 - G-20 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  3. CHECK HEADLIGHT UNIT LH


    1. Replace the headlight unit LH with a new one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

    3. Turn the power switch on (IG).

    4. Operate the light control switch to turn on the high beam headlights.

    5. Check for DTCs.

      Click here


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

    OK

    END (HEADLIGHT UNIT LH WAS DEFECTIVE)

    NG

    REPLACE LIGHT CONTROL LED ECU LH Click here

  4. INSPECT HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the headlight unit RH.

      Click here

      B002H19C01
      *a

      Component without harness connected

      (Light Control LED ECU RH)

      		 *b

      Component without harness connected

      (Headlight Unit RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F-14 - H-12 Always Below 1 Ω
      F-5 - H-1 Always Below 1 Ω
      F-13 - H-13 Always Below 1 Ω
      F-4 - H-2 Always Below 1 Ω
      F-12 - H-14 Always Below 1 Ω
      F-3 - H-3 Always Below 1 Ω
      F-11 - H-15 Always Below 1 Ω
      F-2 - H-4 Always Below 1 Ω
      F-10 - H-16 Always Below 1 Ω
      F-1 - H-5 Always Below 1 Ω
      F-9 - H-17 Always Below 1 Ω
      G-10 - H-6 Always Below 1 Ω
      G-14 - G-20 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  5. CHECK HEADLIGHT UNIT RH


    1. Replace the headlight unit assembly RH with a new one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

    3. Turn the power switch on (IG).

    4. Operate the light control switch to turn on the high beam headlights.

    5. Check for DTCs.

      Click here


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

    OK

    END (HEADLIGHT UNIT RH WAS DEFECTIVE)

    NG

    REPLACE LIGHT CONTROL LED ECU RH Click here