REAR 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 seat by power seat motor operation, this DTC is output.

DTC Code DTC Detection Condition Trouble Area
B2651 Sensor's forward and backward lock detection position is the same

  • Position control ECU

  • Rear seat reclining adjuster assembly

  • Harness or connector

WIRING DIAGRAM

A01H1XOE15

INSPECTION PROCEDURE

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.

      Rear Right Seat (for LHD)
      Tester Display Test Part Control Range Diagnostic Note
      Seat Reclining Seat reclining operation Front / OFF / Rear -
      Rear Left Seat (for RHD)
      Tester Display Test Part Control Range Diagnostic Note
      Seat Reclining Seat reclining operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    INSPECT REAR SEAT RECLINING ADJUSTER ASSEMBLY (POWER SEAT MOTOR) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - OTTOMAN RECLINING MOTOR)


    1. A01GXFYE03

      for LHD:


      1. Disconnect the f39 ECU connector.

      2. Disconnect the R71 motor connector.

    2. for RHD:


      1. Disconnect the f43 ECU connector.

      2. Disconnect the S94 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      f39-17 (PVCC) - R71-5 (PVCC) Always Below 1 Ω
      f39-8 (SSRR) - R71-2 (SSRR) Always Below 1 Ω
      f39-23 (SGND) - R71-6 (GND) Always Below 1 Ω
      f39-17 (PVCC) - Body ground Always 10 kΩ or higher
      f39-8 (SSRR) - Body ground Always 10 kΩ or higher
      f39-23 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      f43-17 (PVCC) - S94-5 (PVCC) Always Below 1 Ω
      f43-8 (SSRR) - S94-2 (SSRR) Always Below 1 Ω
      f43-23 (SGND) - S94-6 (GND) Always Below 1 Ω
      f43-17 (PVCC) - Body ground Always 10 kΩ or higher
      f43-8 (SSRR) - Body ground Always 10 kΩ or higher
      f43-23 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK REAR SEAT RECLINING ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)


    1. A01H01UE16

      for LHD:

      Disconnect the R71 motor connector.

    2. for RHD:

      Disconnect the S94 motor connector.

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      R71-5 (PVCC) - R71-6 (GND) Reclining switch ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      S94-5 (PVCC) - S94-6 (GND) Reclining switch ON 7.2 to 8.8 V

    NG

    REPLACE POSITION CONTROL ECU Click here

    OK

  4. CHECK REAR SEAT RECLINING ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)


    1. A01GWWXE16

      for LHD:

      Reconnect the R71 motor connector.

    2. for RHD:

      Reconnect the S94 motor connector.

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      R71-2 (SSRR) - Body ground Reclining switch ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      S94-2 (SSRR) - Body ground Reclining switch ON 0 to 8 V

    NG

    REPLACE REAR SEAT RECLINING ADJUSTER ASSEMBLY Click here

    OK

  5. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck for DTC.

      OK
      DTC B2651 is not output.

    NG

    REPLACE POSITION CONTROL ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  6. INSPECT REAR SEAT RECLINING ADJUSTER ASSEMBLY (POWER SEAT MOTOR)


    1. A01H230E01

      Check operation of the power seat motor (reclining motor).


      1. Check if the seat reclining adjuster moves smoothly when the battery is connected to the reclining motor connector terminals.

        OK
        for LHD
        Measurement Condition Operational Direction

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Forward

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Backward
        for RHD
        Measurement Condition Operational Direction

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Forward

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Backward

    NG

    REPLACE REAR SEAT RECLINING ADJUSTER ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - OTTOMAN RECLINING MOTOR)

    A01GYCKE03

    1. for LHD:


      1. Disconnect the f4 ECU connector.

      2. Disconnect the R71 motor connector.

    2. for RHD:


      1. Disconnect the f24 ECU connector.

      2. Disconnect the S94 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      f4-2 (RCL+) - R71-4 (RBFW) Always Below 1 Ω
      f4-7 (RCL-) - R71-3 (RBBA) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      f24-2 (RCL+) - S94-3 (RBFW) Always Below 1 Ω
      f24-7 (RCL-) - S94-4 (RBBA) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU Click here