FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2654

DTC Code DTC Name
B2654 Headrest Sensor Malfunction

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
B2654 Detected seat position does not change in response to seat movement

  • Front power seat switch

  • Front seat headrest adjuster

  • Harness or connector

WIRING DIAGRAM

A01H0LAE08
A01GYI1E06
A01H0LAE11

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
        B2654 output from driver seat ECU A
        B2654 output from passenger seat ECU B

    B

    CHECK VEHICLE 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
      Headrest Operation Seat headrest operation UP / DOWN -
      OK
      Motor operates normally.

    NG

    CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) Click here

    OK

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

    A01H0FLE01

    1. for LHD:


      1. Disconnect the e46 switch connector.

      2. Disconnect the e53 motor connector.

    2. for RHD:


      1. Disconnect the e79 switch connector.

      2. Disconnect the e84 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) - e53-2 (VCC) Always Below 1 Ω
      e46-21 (SSRH) - e53-4 (O/P) Always Below 1 Ω
      e46-18 (SGND) - e53-3 (GND) Always Below 1 Ω
      e46-8 (PVCC) - Body ground Always 10 kΩ or higher
      e46-21 (SSRH) - 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) - e84-2 (VCC) Always Below 1 Ω
      e79-21 (SSRH) - e84-4 (O/P) Always Below 1 Ω
      e79-18 (SGND) - e84-3 (GND) Always Below 1 Ω
      e79-8 (PVCC) - Body ground Always 10 kΩ or higher
      e79-21 (SSRH) - 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 HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR)

    A01H0CAE01

    1. for LHD:

      Disconnect the e53 motor connector.

    2. for RHD:

      Disconnect the e84 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
      e53-2 (VCC) - e53-3 (GND) Headrest switch signal ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e84-2 (VCC) - e84-3 (GND) Headrest switch signal ON 7.2 to 8.8 V

    NG

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

    OK

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

    A01GYWJE01

    1. for LHD:

      Reconnect the e53 motor connector.

    2. for RHD:

      Reconnect the e84 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
      e53-4 (O/P) - Body ground Headrest switch signal ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e84-4 (O/P) - Body ground Headrest switch signal ON 0 to 8 V

    NG

    REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY Click here

    OK

  6. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck the DTC.

      OK
      DTC B2654 is not output.

    NG

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

    OK

    END

  7. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)


    1. A01H18EE04

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


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → 1

        Battery negative (-) → 5

        		 Upward

        Battery positive (+) → 5

        Battery negative (-) → 1

        		 Downward

    NG

    REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY Click here

    OK

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

    A01H1RIE02

    1. for LHD:


      1. Disconnect the e45 switch connector.

      2. Disconnect the e53 motor connector.

    2. for RHD:


      1. Disconnect the e78 switch connector.

      2. Disconnect the e84 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e45-11 (H+) - e53-1 (UP) Always Below 1 Ω
      e45-8 (H-) - e53-5 (DOWN) Always Below 1 Ω
      e45-11 (H+) - Body ground Always 10 kΩ or higher
      e45-8 (H-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e78-11 (H+) - e84-1 (UP) Always Below 1 Ω
      e78-8 (H-) - e84-5 (DOWN) Always Below 1 Ω
      e78-11 (H+) - Body ground Always 10 kΩ or higher
      e78-8 (H-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  9. CHECK VEHICLE


    1. Check the type of headrest.

      Result
      Result Proceed to
      w/ Folding Headrest A
      w/ Normal Headrest B

    B

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

    A

  10. 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
      Headrest Operation Seat headrest operation UP / DOWN -
      OK
      Motor operates normally.

    NG

    CHECK POWER SEAT MOTOR ASSEMBLY Click here

    OK

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

    A01H1A1E20

    1. for LHD:


      1. Disconnect the e20 switch connector.

      2. Disconnect the e56 sensor connector.

    2. for RHD:


      1. Disconnect the e72 switch connector.

      2. Disconnect the e80 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) - e56-3 (VCC) Always Below 1 Ω
      e20-21 (SSRH) - e56-1 (O/P) Always Below 1 Ω
      e20-18 (SGND) - e56-2 (GND) Always Below 1 Ω
      e20-8 (PVCC) - Body ground Always 10 kΩ or higher
      e20-21 (SSRH) - 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) - e80-3 (VCC) Always Below 1 Ω
      e72-21 (SSRH) - e80-1 (O/P) Always Below 1 Ω
      e72-18 (SGND) - e80-2 (GND) Always Below 1 Ω
      e72-8 (PVCC) - Body ground Always 10 kΩ or higher
      e72-21 (SSRH) - 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

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

    A01GWW4E13

    1. for LHD:

      Disconnect the e56 sensor connector.

    2. for RHD:

      Disconnect the e80 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
      e56-3 (VCC) - e56-2 (GND) Headrest switch signal ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e80-3 (VCC) - e80-2 (GND) Headrest switch signal ON 7.2 to 8.8 V

    NG

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

    OK

  13. CHECK FRONT SEAT HEADREST ADJUSTER (POSITION CONTROL SENSOR)

    A01GZ9BE12

    1. for LHD:

      Reconnect the e56 sensor connector.

    2. for RHD:

      Reconnect the e80 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
      e56-1 (O/P) - Body ground Headrest switch signal ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e80-1 (O/P) - Body ground Headrest switch signal ON 0 to 8 V

    NG

    REPLACE FRONT SEAT HEADREST ADJUSTER

    OK

  14. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck the DTC.

      OK
      DTC B2654 is not output.

    NG

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

    OK

    END

  15. CHECK POWER SEAT MOTOR ASSEMBLY


    1. A01GZ8QE02

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


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Upward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Downward

    NG

    REPLACE POWER SEAT MOTOR ASSEMBLY

    OK

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

    A01GYT8E01

    1. for LHD:


      1. Disconnect the e18 switch connector.

      2. Disconnect the e26 motor connector.

    2. for RHD:


      1. Disconnect the e71 switch connector.

      2. Disconnect the e75 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e18-11 (H+) - e26-1 Always Below 1 Ω
      e18-8 (H-) - e26-2 Always Below 1 Ω
      e18-11 (H+) - Body ground Always 10 kΩ or higher
      e18-8 (H-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e71-11 (H+) - e75-1 Always Below 1 Ω
      e71-8 (H-) - e75-2 Always Below 1 Ω
      e71-11 (H+) - Body ground Always 10 kΩ or higher
      e71-8 (H-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY Click here

  17. 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
      Headrest Operation Seat headrest operation UP / DOWN -
      OK
      Motor operates normally.

    NG

    CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) Click here

    OK

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

    A01H0FLE02

    1. for LHD:


      1. Disconnect the e20 switch connector.

      2. Disconnect the e25 motor connector.

    2. for RHD:


      1. Disconnect the e72 switch connector.

      2. Disconnect the e61 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) - e25-2 (VCC) Always Below 1 Ω
      e20-21 (SSRH) - e25-4 (O/P) Always Below 1 Ω
      e20-18 (SGND) - e25-3 (GND) Always Below 1 Ω
      e20-8 (PVCC) - Body ground Always 10 kΩ or higher
      e20-21 (SSRH) - 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) - e61-2 (VCC) Always Below 1 Ω
      e72-21 (SSRH) - e61-4 (O/P) Always Below 1 Ω
      e72-18 (SGND) - e61-3 (GND) Always Below 1 Ω
      e72-8 (PVCC) - Body ground Always 10 kΩ or higher
      e72-21 (SSRH) - 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

  19. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR)

    A01H0CAE02

    1. for LHD:

      Disconnect the e25 motor connector.

    2. for RHD:

      Disconnect the e61 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
      e25-2 (VCC) - e25-3 (GND) Headrest switch signal ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e61-2 (VCC) - e61-3 (GND) Headrest switch signal ON 7.2 to 8.8 V

    NG

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

    OK

  20. REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR)

    A01GYWJE02

    1. for LHD:

      Reconnect the e25 motor connector.

    2. for RHD:

      Reconnect the e61 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
      e25-4 (O/P) - Body ground Headrest switch signal ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e61-4 (O/P) - Body ground Headrest switch signal ON 0 to 8 V

    NG

    REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY Click here

    OK

  21. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck the DTC.

      OK
      DTC B2654 is not output.

    NG

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

    OK

    END

  22. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)


    1. A01H18EE04

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


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → 1

        Battery negative (-) → 5

        		 Upward

        Battery positive (+) → 5

        Battery negative (-) → 1

        		 Downward

    NG

    REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY Click here

    OK

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

    A01H1RIE03

    1. for LHD:


      1. Disconnect the e18 switch connector.

      2. Disconnect the e25 motor connector.

    2. for RHD:


      1. Disconnect the e71 switch connector.

      2. Disconnect the e61 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e18-11 (H+) - e25-1 (UP) Always Below 1 Ω
      e18-8 (H-) - e25-5 (DOWN) Always Below 1 Ω
      e18-11 (H+) - Body ground Always 10 kΩ or higher
      e18-8 (H-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e71-11 (H+) - e61-1 (UP) Always Below 1 Ω
      e71-8 (H-) - e61-5 (DOWN) Always Below 1 Ω
      e71-11 (H+) - Body ground Always 10 kΩ or higher
      e71-8 (H-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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