LIGHTING SYSTEM, Diagnostic DTC:B241A

DTC Code DTC Name
B241A Rear Height Control Sensor

DESCRIPTION

The headlight leveling ECU assembly receives signals indicating the height of the vehicle from the rear height control sensor sub-assembly.

DTC No. DTC Detecting Condition Trouble Area
B241A

  • Malfunction in rear height control sensor sub-assembly

  • Open or short in rear height control sensor sub-assembly circuit

  • Rear height control sensor sub-assembly

  • Harness or connector

  • Headlight leveling ECU assembly

WIRING DIAGRAM

B001KAPE01
*a Rear Height Control Sensor Sub-assembly
*b Headlight Leveling ECU Assembly

CAUTION / NOTICE / HINT

Note

If either of the following work has been performed, initialization of the headlight leveling ECU assembly is necessary Click here.


  • Replacement of the headlight leveling ECU assembly.

  • Replacement or removal/installation of the rear height control sensor sub-assembly or work that changes the vehicle height such as replacement of suspension components.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B241A is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / HL Auto Leveling / Data List.

    5. Read the display on the intelligent tester.

      HL Auto Leveling
      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 V -
      Rr Height Sens Signal Val Rear height control sensor signal value/0 to 5 V Approx. 2.5 V (When vehicle is level) Value changes according to vehicle height
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY (for LHD) Click here

    C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY (for RHD) Click here

    A

  3. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY


    1. Remove the rear height control sensor sub-assembly Click here.

    2. Connect 3 dry cell batteries (1.5 V) in series.

      B001KSHE01

    3. Connect the positive (+) lead from the batteries to terminal 3 (SHB) and the negative (-) lead from the batteries to terminal 1 (SHG).

    4. Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down.

      Standard Voltage
      Tester Connection Condition Specified Condition
      2 (SHRR) - 1 (SHG) +45° (High) 4.05 V
      0° (Normal) 2.25 V
      -45° (Low) 0.45 V
      Text in Illustration
      *a

      Component without harness connected

      (Rear Height Control Sensor Sub-assembly)

    NG

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - HEIGHT CONTROL SENSOR)


    1. Disconnect the A46 headlight leveling ECU assembly connector.

    2. Disconnect the R2 rear height control sensor sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A46-19 (SHRL) - R2-2 (SHRR) Always Below 1 Ω
      A46-19 (SHRL) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY (for LHD) Click here

    C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY (for RHD) Click here