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AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124B

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DTC Code DTC Name
B124B Automatic High Beam System
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DESCRIPTION

When DTCs for the following systems are stored, this DTC is stored simultaneously.


DTC No. DTC Detection Condition Trouble Area
B124B

Malfunction in automatic high beam system

(Detected for 2 seconds or more)

  • Lane departure alert system

  • CAN communication system

  • Lane departure warning camera

  • Driving support ECU assembly*1

  • Main body ECU (multiplex network body ECU)

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WIRING DIAGRAM


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  1. A0005FTE01

    w/ Dynamic Radar Cruise Control System

  2. A0007Z5E01
    Table 1.
    *1 Lane Departure Warning Camera
    *2 Power Management Control ECU
    *3 Main Body ECU (Multiplex Network Body ECU)
    *4 CAN Communication Line

    w/o Dynamic Radar Cruise Control System

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CAUTION / NOTICE / HINT

Note:

If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

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PROCEDURE


  1. Click here

    CHECK FOR DTC (AUTOMATIC HIGH BEAM SYSTEM)


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC B124B is not output.
      Result
      Result Proceed to
      DTC B124B is not output A

      DTC B124B is output

      (w/ Dynamic Radar Cruise Control System)

      		 B

      DTC B124B is output

      (w/o Dynamic Radar Cruise Control System)

      		 C

  2. Click here

    CHECK FOR DTC (LANE DEPARTURE ALERT SYSTEM)


    1. Check for DTCs (Click here).

      Result
      Result Proceed to
      Lane departure alert system DTCs are not output A
      Lane departure alert system DTCs are output B
      CAN communication system DTCs are output C

  3. Click here

    REPLACE LANE DEPARTURE WARNING CAMERA


    1. Replace the lane departure warning camera with a new or known good one (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC B124B is not output.

    • OK

      END (LANE DEPARTURE WARNING CAMERA WAS DEFECTIVE)

    • NGClick here
  4. Click here

    REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly with a new or known good one (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC B124B is not output.

    • OK

      END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    • NG

      REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

  5. Click here

    CHECK FOR DTC (LANE DEPARTURE ALERT SYSTEM)


    1. Check for DTCs (Click here).

      Result
      Result Proceed to
      Lane departure alert system DTCs are not output A
      Lane departure alert system DTCs are output B
      CAN communication system DTCs are output C

  6. Click here

    REPLACE LANE DEPARTURE WARNING CAMERA


    1. Replace the lane departure warning camera with a new or known good one (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC B124B is not output.

    • OK

      END (LANE DEPARTURE WARNING CAMERA WAS DEFECTIVE)

    • NG

      REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)