LIGHTING SYSTEM, Diagnostic DTC:B241B

DTC Code DTC Name
B241B Front Height Control Sensor

DESCRIPTION

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the front height of the vehicle from the suspension control ECU.

DTC No. DTC Detection Condition Trouble Area
B241B

  • Malfunction in front height control sensor LH

  • Open or short in front height control sensor LH circuit

  • Air suspension system

  • Harness or connector

  • Suspension control ECU

  • AFS ECU (headlight swivel ECU assembly)

WIRING DIAGRAM

A01NGCEE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B241B 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.

      OK
      DTC "C1712/12 Front Height Control Sensor LH Circuit Malfunction" is not output.

    NG

    GO TO AIR SUSPENSION SYSTEM Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Body / AFS / Data List.

    4. Read the display on the intelligent tester.

      AFS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Height Sens Pw Supply Val Height control sensor power supply value / 0 to 6.25 V Approx. 5.0 V -
      Fr Height Sens Signal Val Front height control sensor signal value / 0 to 5 V Approx. 2.5 V (When the vehicle is level) Value is changed according to vehicle height
      OK
      Normal conditions listed above are displayed.

    NG

    CHECK HARNESS AND CONNECTOR (AFS ECU - SUSPENSION CONTROL ECU) Click here

    OK

  4. REPLACE SUSPENSION CONTROL ECU


    1. Temporarily replace the suspension control ECU with a new or normally functioning one Click here for LHD, Click here for RHD).

    2. Check for DTCs Click here.

      OK
      DTC B241B is not output.

    NG

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here

    OK

    END

  5. CHECK HARNESS AND CONNECTOR (AFS ECU - SUSPENSION CONTROL ECU)


    1. A01NE6BE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to AFS ECU (Headlight Swivel ECU Assembly))
      *2

      Front view of wire harness connector

      (to Suspension Control ECU)

      Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector.

    2. Disconnect the A55 suspension control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-17 (SHFL) - A55-23 (SHF2) Always Below 1 Ω
      A53-18 (SBR) - A55-22 (SHB5) Always Below 1 Ω
      A53-21 (SGR) - A55-21 (SHG5) Always Below 1 Ω
      A53-17 (SHFL) - Body ground Always 10 kΩ or higher
      A53-18 (SBR) - Body ground Always 10 kΩ or higher
      A53-21 (SGR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE SUSPENSION CONTROL ECU


    1. Temporarily replace the suspension control ECU with a new or normally functioning one Click here for LHD, Click here for RHD).

    2. Check for DTCs Click here.

      OK
      DTC B241B is not output.

    NG

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here

    OK

    END