FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2653

DTC Code DTC Name
B2653 Lifter Sensor Malfunction

DESCRIPTION

When the front power seat switch (seat ECU) does not receive a sensor signal despite upward or downward movement of the seat by a power seat motor operation, this DTC is output.

DTC Code DTC Detection Condition Trouble Area
B2653 Detected seat position does not change in response to seat movement

  • Front power seat switch

  • Front seat adjuster assembly

  • Harness or connector

WIRING DIAGRAM

A01H26TE22
A01H26TE23

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.


      1. Using the intelligent tester, check which ECU output the DTC.

        Result
        Result Proceed to
        B2653 output from driver seat ECU A
        B2653 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
      Lifter Operation Seat lifter operation UP / DOWN -
      OK
      Motor operates normally.

    NG

    CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR) Click here

    OK

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

    A01GYZ9E51

    1. for LHD:


      1. Disconnect the e46 switch connector.

      2. Disconnect the e116 sensor connector.

    2. for RHD:


      1. Disconnect the e79 switch connector.

      2. Disconnect the e106 sensor 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) - e116-5 (VCC) Always Below 1 Ω
      e46-9 (SSRV) - e116-2 (O/P) Always Below 1 Ω
      e46-18 (SGND) - e116-6 (GND) Always Below 1 Ω
      e46-8 (PVCC) - Body ground Always 10 kΩ or higher
      e46-9 (SSRV) - 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) - e106-5 (VCC) Always Below 1 Ω
      e79-9 (SSRV) - e106-2 (O/P) Always Below 1 Ω
      e79-18 (SGND) - e106-6 (GND) Always Below 1 Ω
      e79-8 (PVCC) - Body ground Always 10 kΩ or higher
      e79-9 (SSRV) - 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)

    A01H01UE32

    1. for LHD:


      1. Disconnect the e116 sensor connector.

    2. for RHD:


      1. Disconnect the e106 sensor connector.

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      e116-5 (VCC) - e116-6 (GND) Lifter switch ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e106-5 (VCC) - e106-6 (GND) Lifter switch ON 7.2 to 8.8 V

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

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


    1. A01GWWXE42

      for LHD:


      1. Reconnect the e116 sensor connector.

    2. for RHD:


      1. Reconnect the e106 sensor connector.

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      e116-2 (O/P) - Body ground Lifter switch ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e106-2 (O/P) - Body ground Lifter switch ON 0 to 8 V

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY Click here

    OK

  6. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Recheck for DTC.

      OK
      DTC B2653 is not output.

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

    END (SYSTEM RETURNS TO NORMAL)

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


    1. Remove the front seat adjuster assembly (front power seat position sensor) Click here.

    2. Inspect the front seat adjuster assembly (front power seat position sensor) Click here.


    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY Click here

    OK

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

    A01H09XE26

    1. for LHD:


      1. Disconnect the e45 and e46 switch connectors.

      2. Disconnect the e116 sensor connector.

    2. for RHD:


      1. Disconnect the e45 and e46 switch connectors.

      2. Disconnect the e106 sensor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e46-2 (RRV+) - e116-4 (UP) Always Below 1 Ω
      e45-5 (RRV-) - e116-3 (DOWN) Always Below 1 Ω
      e46-2 (RRV+) - Body ground Always 10 kΩ or higher
      e45-5 (RRV-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e79-2 (RRV+) - e106-3 (UP) Always Below 1 Ω
      e78-5 (RRV-) - e106-4 (DOWN) Always Below 1 Ω
      e79-2 (RRV+) - Body ground Always 10 kΩ or higher
      e78-5 (RRV-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH 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
      Lifter Operation Seat lifter operation UP / DOWN -
      OK
      Motor operates normally.

    NG

    CHECK FRONT SEAT ADJUSTER ASSEMBLY (FRONT POWER SEAT POSITION SENSOR) Click here

    OK

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


    1. A01GYZ9E52

      for LHD:


      1. Disconnect the e20 switch connector.

      2. Disconnect the e106 sensor connector.

    2. for RHD:


      1. Disconnect the e72 switch connector.

      2. Disconnect the e116 sensor 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) - e106-5 (VCC) Always Below 1 Ω
      e20-9 (SSRL) - e106-2 (O/P) Always Below 1 Ω
      e20-18 (SGND) - e106-6 (GND) Always Below 1 Ω
      e20-8 (PVCC) - Body ground Always 10 kΩ or higher
      e20-9 (SSRL) - 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) - e116-5 (VCC) Always Below 1 Ω
      e72-9 (SSRL) - e116-2 (O/P) Always Below 1 Ω
      e72-18 (SGND) - e116-6 (GND) Always Below 1 Ω
      e72-8 (PVCC) - Body ground Always 10 kΩ or higher
      e72-9 (SSRL) - 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)


    1. A01H01UE33

      for LHD:


      1. Disconnect the e106 sensor connector.

    2. for RHD:


      1. Disconnect the e116 sensor connector.

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      e106-5 (VCC) - e106-6 (GND) Lifter switch ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e116-5 (VCC) - e116-6 (GND) Lifter switch ON 7.2 to 8.8 V

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

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


    1. A01GWWXE43

      for LHD:


      1. Reconnect the e106 sensor connector.

    2. for RHD:


      1. Reconnect the e116 sensor connector.

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      e106-2 (O/P) - Body ground Lifter switch ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e116-2 (O/P) - Body ground Lifter switch ON 0 to 8 V

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY Click here

    OK

  13. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Recheck for DTC Click here.

      OK
      DTC B2653 is not output.

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

    END (SYSTEM RETURNS TO NORMAL)

  14. CHECK FRONT SEAT ADJUSTER ASSEMBLY (FRONT POWER SEAT POSITION SENSOR)


    1. Remove the front seat adjuster assembly (front power seat position sensor) Click here.

    2. Inspect the front seat adjuster assembly (front power seat position sensor) Click here.


    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY Click here

    OK

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

    A01H09XE27

    1. for LHD:


      1. Disconnect the e20 switch connectors.

      2. Disconnect the e106 motor connector.

    2. for RHD:


      1. Disconnect the e72 switch connectors.

      2. Disconnect the e116 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e20-2 (RUP) - e106-3 (UP) Always Below 1 Ω
      e20-5 (RDWN) - e106-4 (DOWN) Always Below 1 Ω
      e20-2 (RUP) - Body ground Always 10 kΩ or higher
      e18-5 (RDWN) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e72-2 (RUP) - e116-4 (UP) Always Below 1 Ω
      e72-5 (RDWN) - e116-3 (DOWN) Always Below 1 Ω
      e72-2 (RUP) - Body ground Always 10 kΩ or higher
      e71-5 (RDWN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here