LIGHTING 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 malfunction in the LIN communication between the AFS ECU and headlight shade ECU.

DTC Code DTC Detection Condition Trouble Area
B2440 Headlight shade ECU LH communication error

  • Headlight assembly LH

  • Headlight shade ECU

  • AFS ECU

  • Harness or connector
B2441 Headlight shade ECU RH communication error

  • Headlight assembly RH

  • Headlight shade ECU

  • AFS ECU

  • Harness or connector

WIRING DIAGRAM

A000URWE06

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  2. CHECK FOR DTC


    1. Turn the power switch on (IG).

    2. Check for DTC Click here.

      OK
      DTC B2440 or B2441 output does not occur

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT - BATTERY AND BODY GROUND)


    1. A000ZYRE01

      Disconnect the B1*1 or B11*2 headlight connector.


      • *1: for LH

      • *2: for RH

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

      Standard Voltage
      for LH
      Tester Connection Condition Specified Condition
      B1-15 (IGED) - Body ground Always 11 to 14 V
      for RH
      Tester Connection Condition Specified Condition
      B11-15 (IGED) - Body ground Always 11 to 14 V

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

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      B1-24 (EED) - Body ground Always Below 1 Ω
      for RH
      Tester Connection Condition Specified Condition
      B11-24 (EED) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (AFS ECU - HEADLIGHT)

    A000X9FE02

    1. Disconnect the A37 AFS ECU connector.

    2. Disconnect the B1*1 or B11*2 headlight connector.


      • *1: for LH

      • *2: for RH

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

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      A37-30 (LH+) - B1-14 (LHM+) Always Below 1 Ω
      A37-30 (LH+) - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      A37-11 (RH+) - B11-14 (RHM+) Always Below 1 Ω
      A37-11 (RH+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT HEADLIGHT ASSEMBLY


    1. A000YYDE02

      Remove the headlight Click here.

    2. Disconnect the headlight shade ECU connector Click here.

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

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      14 (LHM+) - 7 (LIN) Always Below 1 Ω
      15 (IGED) - 6 (IG) Always Below 1 Ω
      24 (EED) - 8 (E) Always Below 1 Ω
      for RH
      Tester Connection Condition Specified Condition
      14 (RHM+) - 7 (LIN) Always Below 1 Ω
      15 (IGED) - 6 (IG) Always Below 1 Ω
      24 (EED) - 8 (E) Always Below 1 Ω

    NG

    REPLACE HEADLIGHT ASSEMBLY Click here

    OK

  6. CHECK HEADLIGHT SHADE ECU


    1. Temporarily replace the headlight shade ECU with a new or normally functioning one Click here.

    2. Turn the power switch on (IG).

    3. Check for DTC Click here.

      OK
      DTC B2440 or B2441 output does not occur

    OK

    END (HEADLIGHT SHADE ECU WAS DEFECTIVE)

    NG

    REPLACE AFS ECU Click here