AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124D and B2432

DTC Code DTC Name
B124D Lost Communication with AFS LIN
B2432 Lost Communication with Automatic High Beam Sensor

DESCRIPTION

The AFS ECU (headlight swivel ECU assembly) receives the high beam ON demand signal (for automatic high beam system) from the inner rear view mirror assembly (automatic high beam sensor) and sends it to the main body ECU (multiplex network body ECU).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B124D

Lost Communication with AFS LIN

Malfunction in LIN communication between AFS ECU (headlight swivel ECU assembly) and inner rear view mirror assembly (automatic high beam sensor)

  • Inner rear view mirror assembly (automatic high beam sensor)

  • Harness or connector

  • AFS ECU (headlight swivel ECU assembly)

B2432

Lost Communication with Automatic High Beam Sensor

Malfunction in LIN communication between AFS ECU (headlight swivel ECU assembly) and inner rear view mirror assembly (automatic high beam sensor)

  • Inner rear view mirror assembly (automatic high beam sensor)

  • Harness or connector

  • AFS ECU (headlight swivel ECU assembly)

WIRING DIAGRAM

E261658E02

CAUTION / NOTICE / HINT

Note:

  • First perform the communication function inspections in Diagnosis System to confirm that there are no CAN communication malfunctions before performing the following procedure.

    Click hereClick hereClick here

  • Inspect the inner rear view mirror assembly before performing the following procedure.

    Click here

  • If the AFS ECU (headlight swivel ECU assembly) has been replaced, it is necessary to synchronize the vehicle information and initialize the AFS ECU (headlight swivel ECU assembly).

    Click here

PROCEDURE

  1. CHECK FOR DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Main Body > Clear DTCs

      Body Electrical > AFS > Clear DTCs

    2. Check for DTCs.

      Click here

      Body Electrical > Main Body > Trouble Codes

      Body Electrical > AFS > Trouble Codes

    Result

    Result

    Proceed to

    DTC B124D and B2432 are not output

    A

    DTC B124D or B2432 is output

    B
    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    B

  2. CHECK HARNESS AND CONNECTOR (AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) - INNER REAR VIEW MIRROR ASSEMBLY (AUTOMATIC HIGH BEAM SENSOR))

    1. Disconnect the A93 AFS ECU (headlight swivel ECU assembly) connector.

    2. Disconnect the O3 inner rear view mirror assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A93-30 (LHT) - O3-5 (LIN)

      Always

      Below 1 Ω

      A93-30 (LHT) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)

    1. Reconnect the A93 AFS ECU (headlight swivel ECU assembly) connector.

    2. E233265C10

      *a

      Front view of wire harness connector

      (to Inner Rear View Mirror Assembly)

      Connect an oscilloscope to the inner rear view mirror assembly connector.

    3. E259634N01

      Check the waveform.

      OK

      Tester Connection

      Tool Setting

      Condition

      Specified Condition

      O3-5 (LIN) - Body ground

      2 V/DIV., 10 ms./DIV.

      Automatic high beam system operating

      Correct waveform is as shown

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE INNER REAR VIEW MIRROR ASSEMBLY

    Click here

    NG

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)

    Click here