LIGHTING SYSTEM, Diagnostic DTC:B241A

DTC Code DTC Name
B241A Rear Height Control Sensor

DESCRIPTION

w/o Air Suspension System:

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the height of the vehicle from the rear height control sensor sub-assembly RH.

DTC No. DTC Detecting Condition Trouble Area
B241A

  • Malfunction in rear height control sensor sub-assembly RH

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

  • Rear height control sensor sub-assembly RH

  • Harness or connector

  • AFS ECU (headlight swivel ECU assembly)

w/ Air Suspension System:

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

DTC No. DTC Detecting Condition Trouble Area
B241A

  • Malfunction in rear height control sensor LH

  • Open or short in rear height control sensor LH circuit

  • Air suspension system

  • Harness or connector

  • Suspension control ECU

  • AFS ECU (headlight swivel ECU assembly)

WIRING DIAGRAM

A01NDQ9E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B241A is not output.

    NG

    CHECK VEHICLE CONDITION Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK VEHICLE CONDITION


    1. Check the vehicle condition.

      Result
      Result Proceed to
      w/o Air Suspension System A
      w/ Air Suspension System B

    B

    CHECK FOR DTC (AIR SUSPENSION SYSTEM) Click here

    A

  3. 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 / AFS / Data List.

    5. Read the display on the intelligent tester.

      AFS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Height Sens Pw Supply Val Rear height control sensor power supply value / 0 to 6.25 V Approx. 5.0 V -
      Rr Height Sens Signal Val Rear 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 - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH) Click here

    OK

  4. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH


    1. A01NGC5E01
      Text in Illustration
      *1

      Component without harness connected

      (Rear Height Control Sensor Sub-assembly RH)

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

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

    3. Connect a positive (+) lead from the battery to terminal 3 (SHB) and a negative (-) lead from the battery 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

    NG

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Click here

    OK

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here

  5. CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH)


    1. A01NH9ZE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Rear Height Control Sensor Sub-assembly RH)
      *2

      Front view of wire harness connector

      (to AFS ECU (Headlight Swivel ECU Assembly))

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

    2. Disconnect the R4 rear height control sensor sub-assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-18 (SBR) - R4-3 (SHB) Always Below 1 Ω
      A53-19 (SHRL) - R4-2 (SHRR) Always Below 1 Ω
      A53-21 (SGR) - R4-1 (SHG) Always Below 1 Ω
      A53-18 (SBR) - Body ground Always 10 kΩ or higher
      A53-19 (SHRL) - 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. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH


    1. A01NGC5E01
      Text in Illustration
      *1

      Component without harness connected

      (Rear Height Control Sensor Sub-assembly RH)

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

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

    3. Connect a positive (+) lead from the battery to terminal 3 (SHB) and a negative (-) lead from the battery 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

    NG

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Click here

    OK

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here

  7. CHECK FOR DTC (AIR SUSPENSION SYSTEM)


    1. Check for DTCs Click here.

      OK
      DTC "C1714 Rear Height Control Sensor LH Circuit Malfunction" is not output.

    NG

    GO TO AIR SUSPENSION SYSTEM Click here

    OK

  8. 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 / AFS / Data List.

    5. Read the display on the intelligent tester.

      AFS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Height Sens Pw Supply Val Rear height control sensor power supply value / 0 to 6.25 V Approx. 5.0 V -
      Rr Height Sens Signal Val Rear 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 (SUSPENSION CONTROL ECU - AFS ECU) Click here

    OK

  9. 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 B241A is not output.

    NG

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here

    OK

    END

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


    1. A01NFM9E02
      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)
      *3

      Front view of wire harness connector

      (to Suspension Control ECU)

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

    2. Disconnect the A54 and A55 suspension control ECU connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-18 (SBR) - A55-22 (SHB5) Always Below 1 Ω
      A53-19 (SHRL) - A54-27 (SHR2) Always Below 1 Ω
      A53-21 (SGR) - A55-21 (SHG5) Always Below 1 Ω
      A53-18 (SBR) - Body ground Always 10 kΩ or higher
      A53-19 (SHRL) - 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

  11. 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 B241A is not output.

    NG

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here

    OK

    END