LIGHTING SYSTEM, Diagnostic DTC:B241A, B241B

DTC Code DTC Name
B241A Rear Height Control Sensor
B241B Front Height Control Sensor

DESCRIPTION


The headlight ECU sub-assembly LH receives the vehicle height value from the absorber control ECU or suspension control ECU*1 via CAN communication and performs auto leveling control.*2

The headlight ECU sub-assembly LH supplies 5 V to the rear height control sensor LH, reads changes in the voltage that occur due to height sensor resistance changes according to the vehicle height, and performs auto leveling control.*3

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
B241A Rear Height Control Sensor

    Detection condition:

  • Power switch on (IG)


    Malfunction status:

  • Abnormal vehicle height value continuously detected from rear height sensor*2

  • Power source voltage malfunction is continuously detected in rear height control sensor LH*3


    Malfunction duration:

  • 10 seconds or more

    w/ Adaptive Variable Suspension System:

  • Adaptive variable suspension system

  • Air suspension system (w/ Air Suspension System)


    w/o Adaptive Variable Suspension System:

  • Rear height control sensor sub-assembly LH

  • Headlight ECU sub-assembly LH

  • Harness or connector

 Headlight ECU sub-assembly LH -
B241B Front Height Control Sensor

    Detection condition:

  • Power switch on (IG)


    Malfunction status:

  • Abnormal vehicle height value continuously detected from rear height sensor


    Malfunction duration:

  • 10 seconds or more

  • Adaptive variable suspension system

  • Air suspension system (w/ Air Suspension System)

 Headlight ECU sub-assembly LH w/ Adaptive Variable Suspension System

WIRING DIAGRAM


  1. w/ Air Suspension System:

    B004YI0E15
    *1 Suspension Control ECU
    *2 Headlight ECU Sub-assembly LH
    *3 CAN Communication Line

  2. w/o Air Suspension System:

    B004U0ME15
    *a Rear Height Control Sensor Sub-assembly LH
    *b Headlight ECU Sub-assembly LH

CAUTION / NOTICE / HINT

Note


  • 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

  • w/o Adaptive Variable Suspension System:

    Before performing the check, check that the rear height control sensor sub-assembly LH is installed properly.

    Click here

PROCEDURE


  1. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      w/ Adaptive Variable Suspension System A
      w/o Adaptive Variable Suspension System B

    B

    CHECK FOR DTC Click here

    A

  2. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

    2. Turn the power switch on (IG) and wait for at least 10 seconds or more.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B241A and B241B are not output.
      Result
      Result Proceed to
      OK A
      NG (w/ Air Suspension System) B
      NG (w/o Air Suspension System) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO ADAPTIVE VARIABLE SUSPENSION SYSTEM Click here

    B

  3. CHECK ADAPTIVE VARIABLE SUSPENSION SYSTEM


    1. Check whether the adaptive variable suspension system operates normally.

      Click here

      OK
      Adaptive variable suspension system operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO AIR SUSPENSION SYSTEM Click here

    NG

    GO TO ADAPTIVE VARIABLE SUSPENSION SYSTEM Click here

  4. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

    2. Turn the power switch on (IG) and wait for at least 10 seconds or more.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B241A is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  5. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH


    1. Remove the rear height control sensor sub-assembly LH.

      Click here

    2. Inspect the rear height control sensor sub-assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH)


    1. Disconnect the A31 headlight ECU sub-assembly LH connector.

    2. Disconnect the L179 rear height control sensor sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A31-16 (SBR) - L179-3 (SHB) Always Below 1 Ω
      A31-17 (SHRL) - L179-2 (SHRL) Always Below 1 Ω
      A31-15 (SGR) - L179-1 (SHG) Always Below 1 Ω
      A31-16 (SBR) or L179-3 (SHB) - Body ground Always 10 kΩ or higher
      A31-17 (SHRL) or L179-2 (SHRL) - Body ground Always 10 kΩ or higher
      A31-15 (SGR) or L179-1 (SHG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR