FRONT POWER SEAT CONTROL SYSTEM(w/ Memory), Diagnostic DTC:B2651

DTC Code DTC Name
B2651 Reclining Sensor Malfunction

DESCRIPTION

When the position control ECU and switch assembly does not receive a sensor signal despite forward or backward movement of the seatback by power seat motor operation, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2651 Reclining Sensor Malfunction The forward and backward lock detection position of the sensor is the same.

  • Position control ECU and switch assembly

  • Reclining motor (Separate type front seatback spring assembly)

  • Harness or connector

WIRING DIAGRAM

A00YXJME10

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (RECLINING MOTOR)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Driver Seat / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Driver Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Seat Reclining Seat reclining operation OFF/Rear/Front -

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Seat Reclining
      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY) Click here

    OK

  2. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (RECLINING MOTOR CIRCUIT)


    1. A00YV0RC51
      *a

      Front view of wire harness connector

      (to Reclining Motor [Separate Type Front Seatback Spring Assembly])

      Disconnect the f1 reclining motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      f1-2 - f1-3 Reclining switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - RECLINING MOTOR) Click here

    OK

  3. CHECK RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY)


    1. A00YXTLC35
      *a

      Component with harness connected

      (Reclining Motor [Separate Type Front Seatback Spring Assembly])

      Reconnect the f1 reclining motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      f1-2 - Body ground Reclining switch on 4.5 to 4.8 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

    REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY) Click here

  4. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - RECLINING MOTOR)


    1. Disconnect the e6 position control ECU and switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e6-11 (SSRR) - f1-2 Always Below 1 Ω
      e6-1 (SGND) - f1-3 Always Below 1 Ω
      e6-11 (SSRR) - Body ground Always 10 kΩ or higher
      e6-1 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY)


    1. Remove the separate type front seatback spring assembly.

      Click here

    2. Inspect the separate type front seatback spring assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - RECLINING MOTOR)


    1. Disconnect the e18 position control ECU and switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e18-9 (RCL+) - f1-4 Always Below 1 Ω
      e18-11 (RCL-) - f1-1 Always Below 1 Ω
      e18-9 (RCL+) - Body ground Always 10 kΩ or higher
      e18-11 (RCL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR