LIGHTING SYSTEM, Diagnostic DTC:B2416 and B241A

DTC Code DTC Name
B2416 Height Control Sensor Malfunction
B241A Rear Height Control Sensor

DESCRIPTION

The headlight leveling ECU receives signals indicating the height of the vehicle from the height control sensor.

DTC Code

DTC Detection Condition

Trouble Area

B2416

Either condition is met:

  • Malfunction in the height control sensor.

  • Open or short in the height control sensor circuit.

  • Rear height control sensor sub-assembly

  • Harness or connector

  • Headlight leveling ECU assembly

B241A

WIRING DIAGRAM

E183426E16

CAUTION / NOTICE / HINT

Tip:

After replacing the headlight leveling ECU, initialization of the ECU is necessary (Click here).

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER

    1. Using the intelligent tester, read the Data List (Click here).

      Table 1. 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 to 5 V

      Approximately 5.0 V

      -

      Rr Height Sens Signal Val

      Rear height control sensor signal value / 0 to 5 V

      Approximately 2.5 V (When vehicle level)

      The value becomes larger when the front of the vehicle tilts up.

      OK

      The display is as specified in the normal condition column.

      Table 2. Result

      Result

      Proceed to

      NG

      A

      OK (for LHD)

      B

      OK (for RHD)

      C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

    (Click here)

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

    (Click here)

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

    1. U123670E02

      Disconnect the A49 headlight leveling ECU connector.

    2. Disconnect the P1 height control sensor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A49-12 (SBR) - P1-3 (SHB)

      Always

      Below 1 Ω

      A49-19 (SHRL) - P1-2 (SHRR)

      Always

      Below 1 Ω

      A49-21 (SGR) - P1-1 (SHG)

      Always

      Below 1 Ω

      A49-12 (SBR) - Body ground

      Always

      10 kΩ or higher

      A49-19 (SHRL) - Body ground

      Always

      10 kΩ or higher

      A49-21 (SGR) - Body ground

      Always

      10 kΩ or higher
      Table 3. Text in Illustration

      *1

      Front view of wire harness connector

      (to Headlight Leveling ECU Assembly)

      *2

      Front view of wire harness connector

      (to Rear Height Control Sensor Sub-assembly)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HEADLIGHT LEVELING ECU ASSEMBLY

    1. U123668E02

      Reconnect the A49 headlight leveling ECU connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      A49-12 (SBR) - A49-21 (SGR)

      Ignition switch ON

      4.75 to 5.25 V
      Table 4. Text in Illustration

      *1

      Component with harness connected

      (Headlight Leveling ECU Assembly)
      Table 5. Result

      Result

      Proceed to

      OK

      A

      NG (for LHD)

      B

      NG (for RHD)

      C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

    (Click here)

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

    (Click here)

  4. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY

    1. Remove the height control sensor (Click here).

      E184275E07
      Table 6. Text in Illustration

      *1

      Min. Low

      *2

      Normal

      *3

      Max. High

      *4

      45°

      *5

      Component without harness connected

      (Rear Height Control Sensor Sub-assembly)

      -

      -

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

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

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      2 (SHRR) - 1 (SHG)

      Max. high

      Approximately 4.5 V

      Normal

      Approximately 2.5 V

      Min. low

      Approximately 0.5 V
      Table 7. Result

      Result

      Proceed to

      OK (for LHD)

      A

      OK (for RHD)

      B

      NG

      C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

    (Click here)

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

    (Click here)

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY

    (Click here)