LIGHTING SYSTEM, Diagnostic DTC:B124B

DTC Code DTC Name
B124B Automatic High Beam System

DESCRIPTION

The DTC is stored when the main body ECU (driver side junction block assembly) detects malfunctions in the automatic high beam system.

DTC No. DTC Detection Condition Trouble Area
B124B Malfunction in automatic high beam system

  • Steering angle sensor, VSC system or EFI system

  • Inner rear view mirror assembly

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.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B124B is not output.

    NG

    CHECK FOR DTC Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B2414 is output A
      DTC B2415 is output B
      DTC U0126, DTC U0129 or DTC U0101 is output C
      Other DTC is not output D

    B

    GO TO DTC CHART Click here

    C

    GO TO DTC CHART Click here

    D

    REPLACE INNER REAR VIEW MIRROR ASSEMBLY Click here

    A

    GO TO DTC CHART Click here