FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B265B

DTC Code DTC Name
B265B Lumbar Support Sensor Circuit

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 stored.

DTC Code DTC Detection Condition Trouble Area
B265B The forward and backward lock detection position of the sensor is the same.

  • Front power seat switch

  • Lumbar support adjuster assembly

  • Harness or connector

WIRING DIAGRAM

A01GXH7E02
A01H1DQE02

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
        B265B output from driver seat ECU A
        B265B output from passenger seat ECU B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (LUMBAR SLIDE) 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
      Lumbar Slide Lumbar sliding operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY (POWER SEAT MOTOR) Click here

    OK

  3. CHECK FRONT POWER SEAT SWITCH (POSITION CONTROL SENSOR)


    1. A01H01UE29

      for LHD:


      1. Disconnect the e118 motor connector.

    2. for RHD:


      1. Disconnect the e113 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
      e118-2 (SISR) - e118-3 (PELE) Lumbar switch ON 4.8 to 5.1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e113-2 (SISR) - e113-3 (PELE) Lumbar switch ON 4.8 to 5.1 V

    NG

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR) Click here

    OK

  4. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR)


    1. A01GWWXE39

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      e118-2 (SISR) - Body ground Lumbar switch ON 4.5 to 4.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e113-2 (SISR) - Body ground Lumbar switch ON 4.5 to 4.8 V

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY (LUMBAR MOTOR) Click here

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

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


    1. A01GYZ9E69

      for LHD:


      1. Disconnect the e46 switch connector.

      2. Disconnect the e118 motor connector.

    2. for RHD:


      1. Disconnect the e79 switch connector.

      2. Disconnect the e113 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e46-6 (SSLB) - e118-2 (SISR) Always Below 1 Ω
      e46-18 (SGND) - e118-3 (PELE) Always Below 1 Ω
      e46-6 (SSLB) - Body ground Always 10 kΩ or higher
      e46-18 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e79-6 (SSLB) - e113-2 (SISR) Always Below 1 Ω
      e79-18 (SGND) - e113-3 (PELE) Always Below 1 Ω
      e79-6 (SSLB) - 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

    REPLACE FRONT POWER SEAT SWITCH Click here

  6. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY (POWER SEAT MOTOR)


    1. Remove the lumbar support adjuster assembly Click here.

    2. Inspect the lumbar support adjuster assembly Click here.


    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY Click here

    OK

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


    1. A01H24PE11

      for LHD:


      1. Disconnect the e45 switch connector.

      2. Disconnect the e118 motor connector.

    2. for RHD:


      1. Disconnect the e78 switch connector.

      2. Disconnect the e113 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e45-10 (L+) - e118-5 (H) Always Below 1 Ω
      e45-1 (L-) - e118-6 (R) Always Below 1 Ω
      e45-10 (L+) - Body ground Always 10 kΩ or higher
      e45-1 (L-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e78-10 (L+) - e113-5 (H) Always Below 1 Ω
      e78-1 (L-) - e113-6 (R) Always Below 1 Ω
      e78-10 (L+) - Body ground Always 10 kΩ or higher
      e78-1 (L-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

  8. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (LUMBAR SLIDE)


    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
      Lumbar Slide Lumbar sliding operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY (POWER SEAT MOTOR) Click here

    OK

  9. CHECK FRONT POWER SEAT SWITCH (LUMBAR MOTOR CIRCUIT)


    1. A01H01UE30

      for LHD:


      1. Disconnect the e108 motor connector.

    2. for RHD:


      1. Disconnect the e119 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
      e108-2 (SISR) - e108-3 (PELG) Lumbar switch ON 4.8 to 5.1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e119-2 (SISR) - e119-3 (PELG) Lumbar switch ON 4.8 to 5.1 V

    NG

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - LUMBAR SUPPORT ADJUSTER ASSEMBLY RH) Click here

    OK

  10. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (LUMBAR MOTOR)


    1. A01GWWXE40

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      e108-2 (SISR) - Body ground Lumbar switch ON 4.5 to 4.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      e119-2 (SISR) - Body ground Lumbar switch ON 4.5 to 4.8 V

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY Click here

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

  11. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - LUMBAR SUPPORT ADJUSTER ASSEMBLY RH)


    1. A01GYZ9E49

      for LHD:


      1. Disconnect the e20 switch connector.

      2. Disconnect the e108 motor connector.

    2. for RHD:


      1. Disconnect the e72 switch connector.

      2. Disconnect the e119 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e20-6 (SSLB) - e108-2 (SISR) Always Below 1 Ω
      e20-18 (SGND) - e108-3 (PELG) Always Below 1 Ω
      e20-6 (SSLB) - Body ground Always 10 kΩ or higher
      e20-18 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e72-6 (SSLB) - e119-2 (SISR) Always Below 1 Ω
      e72-18 (SGND) - e119-3 (PELG) Always Below 1 Ω
      e72-6 (SSLB) - 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

    REPLACE FRONT POWER SEAT SWITCH Click here

  12. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY (POWER SEAT MOTOR)


    1. Remove the lumbar support adjuster assembly RH Click here.

    2. Inspect the lumbar support adjuster assembly RH Click here.


    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY Click here

    OK

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

    A01GYHIE04

    1. for LHD:


      1. Disconnect the e20 switch connector.

      2. Disconnect the e108 motor connector.

    2. for RHD:


      1. Disconnect the e71 switch connector.

      2. Disconnect the e119 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      e18-10 (L+) - e108-5 (H1) Always Below 1 Ω
      e18-1 (L-) - e108-6 (R1) Always Below 1 Ω
      e18-10 (L+) - Body ground Always 10 kΩ or higher
      e18-1 (L-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      e71-10 (L+) - e119-5 (H1) Always Below 1 Ω
      e71-1 (L-) - e119-6 (R1) Always Below 1 Ω
      e71-10 (L+) - Body ground Always 10 kΩ or higher
      e71-1 (L-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here