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

DTC Code DTC Name
B2651 Reclining Sensor Malfunction

DESCRIPTION

When the position control ECU assembly (driver seat) does not receive a reclining motor position sensor signal despite the seat having been moved forward or rearward by power seat motor operation, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2651 Reclining Sensor Malfunction Reclining motor position sensor signal not received when power seat moved forward or rearward

  • Position control ECU assembly (driver seat)

  • Reclining motor (Front seatback frame sub-assembly (driver seat))

  • Wire harness or connector

WIRING DIAGRAM

B0087WOE05

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2651 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. PERFORM ACTIVE TEST USING GTS (SEAT RECLINING OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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
      Reclining motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT)) Click here

    OK

  4. CHECK POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) (RECLINING MOTOR CIRCUIT)


    1. Disconnect the c1*1 or o1*2 reclining motor (front seatback frame sub-assembly (driver seat)) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      c1-2 - c1-3 Reclining switch on 4.8 to 5.1 V
      for RHD
      Tester Connection Condition Specified Condition
      o1-2 - o1-3 Reclining switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) - RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT))) Click here

    OK

  5. CHECK RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT))


    1. B0088NGC66
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

      (Reclining Motor (Front Seatback Frame Sub-assembly (Driver Seat)))

      Reconnect the c1*1 or o1*2 reclining motor (front seatback frame sub-assembly (driver seat)) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      c1-2 - Body ground Reclining motor operating 4.5 to 4.8 V
      for RHD
      Tester Connection Condition Specified Condition
      o1-2 - Body ground Reclining motor operating 4.5 to 4.8 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPLACE RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT)) Click here

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) - RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT)))


    1. Disconnect the b25*1 or a12*2 position control ECU assembly (driver seat) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b25-11 (SSRR) - c1-2 Always Below 1 Ω
      b25-11 (SSRR) or c1-2 - Body ground Always 10 kΩ or higher
      b25-12 (SENG) - c1-3 Always Below 1 Ω
      b25-12 (SENG) or c1-3 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a12-11 (SSRR) - o1-2 Always Below 1 Ω
      a12-11 (SSRR) or o1-2 - Body ground Always 10 kΩ or higher
      a12-12 (SENG) - o1-3 Always Below 1 Ω
      a12-12 (SENG) or o1-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT))


    1. Remove the reclining motor (front seatback frame sub-assembly (driver seat)).

      Click here

    2. Inspect the reclining motor (front seatback frame sub-assembly (driver seat)).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT)) Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) - RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT)))


    1. Disconnect the b23*1 and b24*1 or a10*2 and a11*2 position control ECU assembly (driver seat) connectors.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b23-10 (RCL+) - c1-1 Always Below 1 Ω
      b23-10 (RCL+) or c1-1 - Body ground Always 10 kΩ or higher
      b24-6 (RCL-) - c1-4 Always Below 1 Ω
      b24-6 (RCL-) or c1-4 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a10-10 (RCL+) - o1-1 Always Below 1 Ω
      a10-10 (RCL+) or o1-1 - Body ground Always 10 kΩ or higher
      a11-6 (RCL-) - o1-4 Always Below 1 Ω
      a11-6 (RCL-) or o1-4 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR