LIGHTING SYSTEM(w/ Automatic Headlight Beam Level Control System), Diagnostic DTC:B242E

DTC Code DTC Name
B242E Open in IG Circuit

DESCRIPTION

The headlight ECU sub-assembly operates using the power source voltage input from the IG terminal and ECUB terminal.

The IG terminal power source voltage is supplied by turning the IG1-NO. 1 relay to ON.

The headlight ECU sub-assembly receives ignition switch ON signals from the main body ECU (multiplex network body ECU) via CAN communication, compares the ignition switch ON signal and the power source voltage supply condition of the IG terminal and monitors the result.

HL AutoLeveling
DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242E Open in IG Circuit

    Detection condition:

  • The ignition switch is ON.


    Malfunction status:

  • When the IG terminal power source voltage is 0 V (ignition switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received


    Malfunction duration:

  • 10 seconds or more

  • Headlight ECU sub-assembly LH

  • Harness or connector

 Headlight ECU sub-assembly LH
HL AutoLeveling (Sub)
DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242E Open in IG Circuit

    Detection condition:

  • The ignition switch is ON.


    Malfunction status:

  • When the IG terminal power source voltage is 0 V (ignition switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received


    Malfunction duration:

  • 10 seconds or more

  • Headlight ECU sub-assembly RH

  • Harness or connector

 Headlight ECU sub-assembly RH

WIRING DIAGRAM

B006WV7E02
*a from IG1-NO. 1 Relay
*b ECU-IG1 NO. 3
*c Headlight ECU Sub-assembly LH
*d Headlight ECU Sub-assembly RH

CAUTION / NOTICE / HINT

Note


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

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

    Click here

PROCEDURE


  1. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

    5. Clear the DTCs.


      Body Electrical > HL AutoLeveling > Clear DTCs
      Body Electrical > HL AutoLeveling (Sub) > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Wait 10 seconds or more.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

    6. Check for DTCs.


      Body Electrical > HL AutoLeveling > Trouble Codes
      Body Electrical > HL AutoLeveling (Sub) > Trouble Codes
      OK
      DTC B242E is not output.
      Result
      Result Proceed to
      OK A
      NG (DTC output from headlight ECU sub-assembly LH) B
      NG (DTC output from headlight ECU sub-assembly RH) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH (IG TERMINAL VOLTAGE) Click here

    B

  3. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH (IG TERMINAL VOLTAGE)

    B006YC8C41
    *a

    Front view of wire harness connector

    (to Headlight ECU Sub-assembly LH)

    1. Disconnect the A10 headlight ECU sub-assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A10-4 (IG) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A10-12 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH (IG TERMINAL VOLTAGE)

    B006YC8C42
    *a

    Front view of wire harness connector

    (to Headlight ECU Sub-assembly RH)

    1. Disconnect the A11 headlight ECU sub-assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A11-4 (IG) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A11-12 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR