ADAPTIVE HIGH BEAM SYSTEM, Diagnostic DTC:B2440, B2441

DTC Code DTC Name
B2440 Lost Communication with AHS EDU LH Module
B2441 Lost Communication with AHS EDU RH Module

DESCRIPTION

This DTC is output when there is a CAN communication malfunction between the headlight control computer assembly and headlight control computer assembly. The headlight control computer assembly LH outputs DTCs B2440 and B2441.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2440 Lost Communication with AHS EDU LH Module Headlight control computer assembly LH communication malfunction

  • Headlight unit LH

  • Headlight light control ECU sub-assembly LH

  • Headlight control computer assembly LH
B2441 Lost Communication with AHS EDU RH Module Headlight control computer assembly RH communication malfunction

  • Headlight unit RH

  • Headlight light control ECU sub-assembly RH

  • Headlight control computer assembly RH

  • Headlight control computer assembly LH

WIRING DIAGRAM

B002DZYE02

CAUTION / NOTICE / HINT

Note

If the headlight control computer assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight control computer 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. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2440 and B2441 are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B2440 is output) B
      NG (DTC B2441 is output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (HEADLIGHT CONTROL COMPUTER ASSEMBLY LH - HEADLIGHT CONTROL COMPUTER ASSEMBLY RH) Click here

    B

  3. INSPECT HEADLIGHT UNIT LH


    1. Remove the headlight assembly LH.

      Click here

    2. Remove the headlight control computer assembly LH.

      Click here

    3. Remove the headlight light control ECU sub-assembly LH.

      Click here

    4. B002CHVC03
      *a

      Component without harness connected

      (Headlight Control Computer Assembly LH Side Connector)
      *b

      Component without harness connected

      (Headlight Light Control ECU Sub-assembly LH Side Connector)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B-10 - K-10 Always Below 1 Ω
      B-1 - K-1 Always Below 1 Ω
      C-13 - K-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

    2. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2440 is not output.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE HEADLIGHT CONTROL COMPUTER ASSEMBLY LH Click here

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT CONTROL COMPUTER ASSEMBLY LH - HEADLIGHT CONTROL COMPUTER ASSEMBLY RH)


    1. Disconnect the A29 headlight control computer assembly LH connector.

    2. Disconnect the A30 headlight control computer assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A29-22 (LCH) - A30-22 (LCH) Always Below 1 Ω
      A29-21 (LCL) - A30-21 (LCL) Always Below 1 Ω
      A29-22 (LCH) or A30-22 (LCH) - Body ground Always 10 kΩ or higher
      A29-21 (LCL) or A30-21 (LCL) - Body ground Always Always
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT HEADLIGHT UNIT RH


    1. Remove the headlight assembly RH.

      Click here

    2. Remove the headlight control computer assembly RH.

      Click here

    3. Remove the headlight light control ECU sub-assembly RH.

      Click here

    4. B002CHVC03
      *a

      Component without harness connected

      (Headlight Control Computer Assembly RH Side Connector)
      *b

      Component without harness connected

      (Headlight Light Control ECU Sub-assembly RH Side Connector)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B-10 - K-10 Always Below 1 Ω
      B-1 - K-1 Always Below 1 Ω
      C-13 - K-9 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT RH Click here

    OK

  7. 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

    2. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2441 is not output.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  8. REPLACE HEADLIGHT CONTROL COMPUTER ASSEMBLY RH


    1. Replace the headlight light control ECU sub-assembly RH with a new or known good one.

      Click here

    2. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2441 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT CONTROL COMPUTER ASSEMBLY RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT CONTROL COMPUTER ASSEMBLY LH Click here