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AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM, Diagnostic DTC:B241A

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DTC Code DTC Name
B241A Rear Height Control Sensor
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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
Table 1. *a Rear Height Control Sensor Sub-assembly *b Headlight Leveling ECU Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

If either of the following is 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.

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PROCEDURE


  1. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC B241A is not output.

  2. Click here

    READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the display on the GTS.

      Table 2. HL Auto Leveling
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Height Sens Pw Supply Val Rear height control sensor power supply value / 0.00 to 5.00 V Approximately 5 V -
      Rr Height Sens Signal Val Rear height control sensor signal value / 0.00 to 5.00 V Approximately 2.5 V (When the vehicle is level) Value changes according to vehicle height
      OK
      Normal conditions listed above are displayed.

  3. Click here

    INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY


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

    2. Inspect the rear height control sensor sub-assembly (Click here).


  4. Click here

    CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY)


    1. Disconnect the A29 headlight leveling ECU assembly connector.

    2. Disconnect the Q14 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
      A29-19 (SHRL) - Q14-2 (SHRR) Always Below 1 Ω
      A29-19 (SHRL) - Body ground Always 10 kΩ or higher

    • OK

      REPLACE HEADLIGHT LEVELING ECU ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR