FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2652

DTC Code DTC Name
B2652 Front Vertical 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
B2652 Detected seat position does not change in response to seat movement

  • Front power seat switch

  • Front seat adjuster assembly

  • Harness or connector

WIRING DIAGRAM

A001C1QE28
A001C1QE29

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
        B2652 output from driver seat ECU A
        B2652 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
      Front Vertical Operation Seat front vertical operation UP / DOWN -
      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)


    1. for LHD:

      A001CVGE07

      1. Disconnect the e46 switch connector.

      2. Disconnect the e100 motor connector.

    2. for RHD:


      1. Disconnect the e79 switch connector.

      2. Disconnect the e95 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) - e100-5 (VCC) Always Below 1 Ω
      e46-19 (SSFV) - e100-2 (O/P) Always Below 1 Ω
      e46-18 (SGND) - e100-6 (GND) Always Below 1 Ω
      e46-8 (PVCC) - Body ground Always 10 kΩ or higher
      e46-19 (SSFV) - 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) - e95-5 (VCC) Always Below 1 Ω
      e79-19 (SSFV) - e95-2 (O/P) Always Below 1 Ω
      e79-18 (SGND) - e95-6 (GND) Always Below 1 Ω
      e79-8 (PVCC) - Body ground Always 10 kΩ or higher
      e79-19 (SSFV) - 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)


    1. A00198GE02

      for LHD:

      Disconnect the e100 motor connector.

    2. for RHD:

      Disconnect the e95 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
      e100-5 (VCC) - e100-6 (GND) Front vertical switch signal ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e95-5 (VCC) - e95-6 (GND) Front vertical 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 ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)


    1. A001E2SE02

      for LHD:

      Reconnect the e100 motor connector.

    2. for RHD:

      Reconnect the e95 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
      e100-2 (O/P) - Body ground Front vertical switch signal ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e95-2 (O/P) - Body ground Front vertical switch signal 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 the DTC.

      OK
      DTC B2652 is not output.

    OK

    END (SYSTEM RETURNS TO NORMAL)

    NG

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

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


    1. A0018VNE04
      *1 Component without harness connected: (Power Seat Motor)

      Check operation of the power seat motor (front vertical motor).


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

        OK
        for LHD
        Measurement Condition Operational Direction

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Upward

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Downward
        for RHD
        Measurement Condition Operational Direction

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Upward

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Downward

    NG

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

    OK

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


    1. for LHD:

      A001AE9E03

      1. Disconnect the e45 and e46 switch connectors.

      2. Disconnect the e100 motor connector.

    2. for RHD:


      1. Disconnect the e78 and e79 switch connectors.

      2. Disconnect the e95 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e46-1 (FRV+) - e100-3 (UP) Always Below 1 Ω
      e45-12 (FRV-) - e100-4 (DOWN) Always Below 1 Ω
      e46-1 (FRV+) - Body ground Always 10 kΩ or higher
      e45-12 (FRV-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e79-1 (FRV+) - e95-4 (UP) Always Below 1 Ω
      e78-12 (FRV-) - e95-3 (DOWN) Always Below 1 Ω
      e79-1 (FRV+) - Body ground Always 10 kΩ or higher
      e78-12 (FRV-) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  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
      Front Vertical Operation Seat front vertical operation UP / DOWN -
      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)


    1. for LHD:

      A001CVGE08

      1. Disconnect the e20 switch connector.

      2. Disconnect the e95 motor connector.

    2. for RHD:


      1. Disconnect the e72 switch connector.

      2. Disconnect the e100 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) - e95-5 (VCC) Always Below 1 Ω
      e20-19 (SSFV) - e95-2 (O/P) Always Below 1 Ω
      e20-18 (SGND) - e95-6 (GND) Always Below 1 Ω
      e20-8 (PVCC) - Body ground Always 10 kΩ or higher
      e20-19 (SSFV) - 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) - e100-5 (VCC) Always Below 1 Ω
      e72-19 (SSFV) - e100-2 (O/P) Always Below 1 Ω
      e72-18 (SGND) - e100-6 (GND) Always Below 1 Ω
      e72-8 (PVCC) - Body ground Always 10 kΩ or higher
      e72-19 (SSFV) - 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. A001CQXE02

      for LHD:

      Disconnect the e95 motor connector.

    2. for RHD:

      Disconnect the e100 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
      e95-5 (VCC) - e95-6 (GND) Front vertical switch signal ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e100-5 (VCC) - e100-6 (GND) Front vertical switch signal 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)


    1. A001D14E02

      for LHD:

      Reconnect the e95 motor connector.

    2. for RHD:

      Reconnect the e100 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
      e95-2 (O/P) - Body ground Front vertical switch signal ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e100-2 (O/P) - Body ground Front vertical switch signal 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 the DTC.

      OK
      DTC B2652 is not output.

    OK

    END (SYSTEM RETURNS TO NORMAL)

    NG

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

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


    1. A0018VNE04
      *1 Component without harness connected: (Power Seat Motor)

      Check operation of the power seat motor (front vertical motor).


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

        OK
        for LHD
        Measurement Condition Operational Direction

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Upward

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Downward
        for RHD
        Measurement Condition Operational Direction

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Upward

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Downward

    NG

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

    OK

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


    1. for LHD:

      A001AE9E04

      1. Disconnect the e18 and e20 switch connectors.

      2. Disconnect the e95 motor connector.

    2. for RHD:


      1. Disconnect the e71 and e72 switch connectors.

      2. Disconnect the e100 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e20-1 (FUP) - e95-4 (UP) Always Below 1 Ω
      e18-12 (FDWN) - e95-3 (DOWN) Always Below 1 Ω
      e20-1 (FUP) - Body ground Always 10 kΩ or higher
      e18-12 (FDWN) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e72-1 (FUP) - e100-3 (UP) Always Below 1 Ω
      e71-12 (FDWN) - e100-4 (DOWN) Always Below 1 Ω
      e72-1 (FUP) - Body ground Always 10 kΩ or higher
      e71-12 (FDWN) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR