FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2651

DTC Code DTC Name
B2651 Reclining Sensor Malfunction

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
B2651 The forward and backward lock detection position of the sensor is the same.

  • Position control ECU

  • Power seat motor assembly (Reclining motor)

  • Harness or connector

WIRING DIAGRAM

B0040QCE06

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (POWER SEAT MOTOR FUNCTION)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check the power seat motor function.

      Driver Seat
      Tester Display Test Part Control Ranger Diagnostic Note
      Seat Reclining Seat reclining operation FRONT / OFF / REAR -
      OK
      Motor operates normally.

    NG

    INSPECT POWER SEAT MOTOR ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR)

    B0040I0E02
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Position Control ECU)
    *4

    Front view of wire harness connector

    (to Power Seat Motor)

    • *1: for LHD

    • *2: for RHD


    1. Disconnect the O26*1 or O16*2 ECU connector.

    2. Disconnect the O22*1 or O12*2 motor connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      O26-3 (PVCC) - O22-6 (VCC) Always Below 1 Ω
      O26-5 (SSRR) - O22-1 (O/P) Always Below 1 Ω
      O26-28 (SGND) - O22-2 (GND) Always Below 1 Ω
      O26-3 (PVCC) - Body ground Always 10 kΩ or higher
      O26-5 (SSRR) - Body ground Always 10 kΩ or higher
      O26-28 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      O16-3 (PVCC) - O12-6 (VCC) Always Below 1 Ω
      O16-5 (SSRR) - O12-1 (O/P) Always Below 1 Ω
      O16-28 (SGND) - O12-2 (GND) Always Below 1 Ω
      O16-3 (PVCC) - Body ground Always 10 kΩ or higher
      O16-5 (SSRR) - Body ground Always 10 kΩ or higher
      O16-28 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK POSITION CONTROL ECU ASSEMBLY

    B0040IWE02
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Power Seat Motor)

    1. Disconnect the O22*1 or O12*2 motor 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 Switch Condition Specified Condition
      O22-6 (VCC) - O22-2 (GND) Reclining switch on 5.5 to 6.5 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      O12-6 (VCC) - O12-2 (GND) Reclining switch on 5.5 to 6.5 V

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  4. CHECK POWER SEAT MOTOR ASSEMBLY (POSITION CONTROL SENSOR)

    B0040F5E02
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Component with harness connected

    (Power Seat Motor)

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      O22-1 (O/P) - O22-2 (GND) Reclining switch on 0 to 6.5 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      O12-1 (O/P) - O12-2 (GND) Reclining switch on 0 to 6.5 V

    NG

    REPLACE POWER SEAT MOTOR ASSEMBLY (RECLINING MOTOR) Click here

    OK

  5. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2651 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  6. INSPECT POWER SEAT MOTOR ASSEMBLY

    B0040JCE01

    1. Remove the power seat motor assembly (reclining motor) Click here.

    2. Check if the motor gear rotates smoothly when the battery is connected to the reclining motor connector terminals.

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 4 (FWD)

      Battery negative (-) → 5 (BACK)

      		 Motor gear rotates clockwise

      Battery positive (+) → 5 (BACK)

      Battery negative (-) → 4 (FWD)

      		 Motor gear rotates counterclockwise

    NG

    REPLACE POWER SEAT MOTOR ASSEMBLY (RECLINING MOTOR) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - POWER SEAT MOTOR)

    B0040LAE02
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Position Control ECU)
    *4

    Front view of wire harness connector

    (to Power Seat Motor)

    • *1: for LHD

    • *2: for RHD


    1. Disconnect the O27*1 or O17*2 ECU connector.

    2. Disconnect the O22*1 or O12*2 motor connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      O27-8 (RCL+) - O22-4 (FWD) Always Below 1 Ω
      O27-10 (RCL-) - O22-5 (BACK) Always Below 1 Ω
      O27-8 (RCL+) - Body ground Always 10 kΩ or higher
      O27-10 (RCL-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      O17-8 (RCL+) - O12-4 (FWD) Always Below 1 Ω
      O17-10 (RCL-) - O12-5 (BACK) Always Below 1 Ω
      O17-8 (RCL+) - Body ground Always 10 kΩ or higher
      O17-10 (RCL-) - Body ground Always 10 kΩ or higher

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR