FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2651

DTC Code DTC Name
B2651 Reclining Sensor Malfunction

DESCRIPTION

When the front power seat switch (seat 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

  • Front power seat switch

  • Front seat adjuster assembly

  • Harness or connector

WIRING DIAGRAM

A01H26TE11
A01H26TE12

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. DTC output area check


      1. Using the intelligent tester, determine the area that output the DTC.

        Result
        Result Proceed to
        B2651 output from driver seat ECU A
        B2651 output from passenger seat ECU B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (POWER SEAT MOTOR FUNCTION) Click here

    A

  2. 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 Range Diagnostic Note
      Seat Reclining Seat reclining operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY (POWER SEAT MOTOR) Click here

    OK

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

    A01GYZ9E16

    1. for LHD:


      1. Disconnect the e46 switch connector.

      2. Disconnect the e103 motor connector.

    2. for RHD:


      1. Disconnect the e79 switch connector.

      2. Disconnect the e97 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e46-8 (PVCC) - e103-5 (VCC) Always Below 1 Ω
      e46-22 (SSRR) - e103-2 (O/P) Always Below 1 Ω
      e46-18 (SGND) - e103-6 (GND) Always Below 1 Ω
      e46-8 (PVCC) - Body ground Always 10 kΩ or higher
      e46-22 (SSRR) - Body ground Always 10 kΩ or higher
      e46-18 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e79-8 (PVCC) - e97-5 (VCC) Always Below 1 Ω
      e79-22 (SSRR) - e97-2 (O/P) Always Below 1 Ω
      e79-18 (SGND) - e97-6 (GND) Always Below 1 Ω
      e79-8 (PVCC) - Body ground Always 10 kΩ or higher
      e79-22 (SSRR) - Body ground Always 10 kΩ or higher
      e79-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

    A01H01UE11

    1. for LHD:

      Disconnect the e103 motor connector.

    2. for RHD:

      Disconnect the e97 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
      e103-5 (VCC) - e103-6 (GND) Reclining switch ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e97-5 (VCC) - e97-6 (GND) Reclining switch ON 7.2 to 8.8 V

    NG

    REPLACE FRONT POWER SEAT SWITCH (for Driver Side) Click here

    OK

  5. CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

    A01GWWXE11

    1. for LHD:

      Reconnect the e103 motor connector.

    2. for RHD:

      Reconnect the e97 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
      e103-2 (O/P) - Body ground Reclining switch ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e97-2 (O/P) - Body ground Reclining switch ON 0 to 8 V

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (for Driver Side) Click here

    OK

  6. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck for DTC.

      OK
      DTC B2651 is not output.

    NG

    REPLACE FRONT POWER SEAT SWITCH (for Driver Side) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  7. INSPECT FRONT SEAT ADJUSTER ASSEMBLY (POWER SEAT MOTOR)


    1. A01H230E04

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


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

        Measurement Condition Operational Direction

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Forward

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Backward

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (for Driver Side) Click here

    OK

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

    A01H09XE16

    1. for LHD:


      1. Disconnect the e46 and e45 switch connectors.

      2. Disconnect the e103 motor connector.

    2. for RHD:


      1. Disconnect the e78 and e79 switch connectors.

      2. Disconnect the e97 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e46-3 (RCL+) - e103-4 (FWD) Always Below 1 Ω
      e45-3 (RCL-) - e103-3 (BACK) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      e79-3 (RCL+) - e97-4 (FWD) Always Below 1 Ω
      e78-3 (RCL-) - e97-3 (BACK) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH (for Driver Side) Click here

  9. 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.

      Passenger Seat
      Tester Display Test Part Control Range Diagnostic Note
      Seat Reclining Seat reclining operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY (POWER SEAT MOTOR) Click here

    OK

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

    A01GYZ9E17

    1. for LHD:


      1. Disconnect the e20 switch connector.

      2. Disconnect the e97 motor connector.

    2. for RHD:


      1. Disconnect the e72 switch connector.

      2. Disconnect the e103 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e20-8 (PVCC) - e97-5 (VCC) Always Below 1 Ω
      e20-22 (SSRR) - e97-2 (O/P) Always Below 1 Ω
      e20-18 (SGND) - e97-6 (GND) Always Below 1 Ω
      e20-8 (PVCC) - Body ground Always 10 kΩ or higher
      e20-22 (SSRR) - Body ground Always 10 kΩ or higher
      e20-18 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e72-8 (PVCC) - e103-5 (VCC) Always Below 1 Ω
      e72-22 (SSRR) - e103-2 (O/P) Always Below 1 Ω
      e72-18 (SGND) - e103-6 (GND) Always Below 1 Ω
      e72-8 (PVCC) - Body ground Always 10 kΩ or higher
      e72-22 (SSRR) - Body ground Always 10 kΩ or higher
      e72-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

    A01H01UE12

    1. for LHD:

      Disconnect the e97 motor connector.

    2. for RHD:

      Disconnect the e103 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
      e97-5 (VCC) - e97-6 (GND) Reclining switch ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e103-5 (VCC) - e103-6 (GND) Reclining switch ON 7.2 to 8.8 V

    NG

    REPLACE FRONT POWER SEAT SWITCH (for Passenger Side) Click here

    OK

  12. CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

    A01GWWXE12

    1. for LHD:

      Reconnect the e97 motor connector.

    2. for RHD:

      Reconnect the e103 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
      e97-2 (O/P) - Body ground Reclining switch ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e103-2 (O/P) - Body ground Reclining switch ON 0 to 8 V

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (for Passenger Side) Click here

    OK

  13. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck for DTC.

      OK
      DTC B2651 is not output.

    NG

    REPLACE FRONT POWER SEAT SWITCH (for Passenger Side) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  14. INSPECT FRONT SEAT ADJUSTER ASSEMBLY (POWER SEAT MOTOR)


    1. A01H230E04

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


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Forward

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Backward

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (for Passenger Side) Click here

    OK

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

    A01H09XE17

    1. for LHD:


      1. Disconnect the e18 and e20 switch connectors.

      2. Disconnect the e97 motor connector.

    2. for RHD:


      1. Disconnect the e71 and e72 switch connectors.

      2. Disconnect the e103 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e20-3 (RCL+) - e97-4 (FWD) Always Below 1 Ω
      e18-3 (RCL-) - e97-3 (BACK) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      e72-3 (RCL+) - e103-4 (FWD) Always Below 1 Ω
      e71-3 (RCL-) - e103-3 (BACK) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH (for Passenger Side) Click here