LIGHTING SYSTEM, Diagnostic DTC:B124D, B2432

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

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
B124D Malfunction in LIN communication system

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

  • Harness or connector

  • AFS ECU

  • Map light assembly
B2432 Malfunction in LIN communication system

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

  • Harness or connector

  • AFS ECU

  • Map light assembly

WIRING DIAGRAM

A01GZ3FE08

INSPECTION PROCEDURE

Note


  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

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

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Check for DTC Click here.

      OK
      DTC B124D is not output

    NG

    CHECK HARNESS AND CONNECTOR (INNER REAR VIEW MIRROR [AUTOMATIC HIGH BEAM SENSOR] - BATTERY) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK HARNESS AND CONNECTOR (INNER REAR VIEW MIRROR [AUTOMATIC HIGH BEAM SENSOR] - BATTERY)


    1. A01GXMRE12

      Disconnect the X21 inner rear view mirror (automatic high beam sensor) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      X21-2 (IG) - X21-10 (E) Power switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (MAP LIGHT - BATTERY AND BODY GROUND) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (AFS ECU - INNER REAR VIEW MIRROR [AUTOMATIC HIGH BEAM SENSOR])


    1. A01H087E06

      Disconnect the A37 AFS ECU connector.

    2. Disconnect the X21 inner rear view mirror (automatic high beam sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A37-11 (RH+) - X21-5 (LIN) Always Below 1 Ω
      A37-11 (RH+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK INNER REAR VIEW MIRROR ASSEMBLY (AUTOMATIC HIGH BEAM SENSOR)


    1. Temporarily replace the inner rear view mirror (automatic high beam sensor) with a new or normally functioning one Click here.

    2. Check for DTC Click here.

      OK
      DTC B124D or B2432 is not output

    NG

    REPLACE AFS ECU Click here

    OK

    END (INNER REAR VIEW MIRROR [AUTOMATIC HIGH BEAM SENSOR] WAS DEFECTIVE)

  5. CHECK HARNESS AND CONNECTOR (MAP LIGHT - BATTERY AND BODY GROUND)


    1. A01GZ5PE04

      Disconnect the X4 and X6 map light connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      X4-9 (IG) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X6-20 (GND4) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (MAP LIGHT - INNER REAR VIEW MIRROR [AUTOMATIC HIGH BEAM SENSOR])


    1. Disconnect the X4 and X6 map light connectors.

      A01H02VE07

    2. Disconnect the X21 inner rear view mirror (automatic high beam sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X4-25 (IG1) - X21-2 (IG) Always Below 1 Ω
      X6-10 (GND1) - X21-10 (E) Always Below 1 Ω
      X4-25 (IG1) - Body ground Always 10 kΩ or higher
      X6-10 (GND1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAP LIGHT ASSEMBLY Click here