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Home >> Lexus >> 2017 >> LS 460 Base, AWD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Front Power Seat Control System - Diagnostic Codes & Symptom Tests >> Front Power Seat Control System >> DTC B265B: Lumbar Support Sensor Circuit [09/2015 - ] >> Procedure

DTC B265B: Lumbar Support Sensor Circuit [09/2015 - ]: Procedure

  1. CHECK FOR DTC 
    1. DTC output area check
      1. Using the Techstream, determine the area that output the DTC (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
        RESULT

        Result Proceed to
        B265B output from driver seat ECU A
        B265B output from passenger seat ECU B

    Result:  B

    B 

    See step  8

    Result:  A

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR FUNCTION) 
    1. Select the Active Test, use the Techstream to generate a control command, and then check the power seat motor function (Refer to DATA LIST / ACTIVE TEST [09/2015 - ] ).
      DRIVER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Lumbar Slide Lumbar sliding operation Front / OFF / Rear -

      OK

      Motor operates normally.

    Result:  NG

    NG 

    See step  6

    Result:  OK

    OK 

    See step  3

  3. CHECK FRONT POWER SEAT SWITCH LH (POSITION CONTROL SENSOR) 
    1. Disconnect the e77 motor connector.
      GTY651420Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      e77-2 (SISR) - e77-3 (PELE) Lumbar switch ON 4.8 to 5.1 V

    Result:  NG

    NG 

    See step  5

    Result:  OK

    OK 

    See step  4

  4. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY653065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      e77-2 (SISR) - Body ground Lumbar switch ON 4.5 to 4.8 V

    Result:  OK

    OK 

    REPLACE FRONT POWER SEAT SWITCH LH 

    (Refer to DISASSEMBLY [09/2015 - ] )

    Result:  NG

    NG 

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (LUMBAR MOTOR) 

    (Refer to REMOVAL [09/2015 - ] )

  5. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR) 
    1. Disconnect the e46 switch connector.
      GTY656869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e77 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e46-6 (SSLB) - e77-2 (SISR) Always Below 1 Ω
      e46-18 (SGND) - e77-3 (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

    Result:  OK

    OK 

    REPLACE FRONT POWER SEAT SWITCH LH 

    (Refer to DISASSEMBLY [09/2015 - ] )

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (POWER SEAT MOTOR) 
    1. Remove the lumbar support adjuster assembly LH (Refer to REMOVAL [09/2015 - ] ).
    2. Inspect the lumbar support adjuster assembly LH (Refer to INSPECTION [09/2015 - ] ).

    Result:  NG

    NG 

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  OK

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR) 
    1. Disconnect the e45 switch connector.
      GTY680304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e77 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e45-10 (L+) - e77-5 (H) Always Below 1 Ω
      e45-1 (L-) - e77-6 (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

    Result:  OK

    OK 

    REPLACE FRONT POWER SEAT SWITCH LH 

    (Refer to DISASSEMBLY [09/2015 - ] )

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. PERFORM ACTIVE TEST USING TECHSTREAM (LUMBAR SLIDE) 
    1. Select the Active Test, use the Techstream to generate a control command, and then check the power seat motor function (Refer to DATA LIST / ACTIVE TEST [09/2015 - ] ).
      PASSENGER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Lumbar Slide Lumbar sliding operation Front / OFF / Rear -

      OK

      Motor operates normally.

    Result:  NG

    NG 

    See step  12

    Result:  OK

    OK 

    See step  9

  9. CHECK FRONT POWER SEAT SWITCH RH (LUMBAR MOTOR CIRCUIT) 
    1. Disconnect the e72 motor connector.
      GTY641591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      e72-2 (SISR) - e72-3 (PELG) Lumbar switch ON 4.8 to 5.1 V

    Result:  NG

    NG 

    See step  11

    Result:  OK

    OK 

    See step  10

  10. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (LUMBAR MOTOR) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY628104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      e72-2 (SISR) - Body ground Lumbar switch ON 4.5 to 4.8 V

    Result:  OK

    OK 

    REPLACE FRONT POWER SEAT SWITCH RH 

    (Refer to DISASSEMBLY [09/2015 - ] )

    Result:  NG

    NG 

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH 

    (Refer to REMOVAL [09/2015 - ] )

  11. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - LUMBAR SUPPORT ADJUSTER ASSEMBLY RH) 
    1. Disconnect the e20 switch connector.
      GTY626043Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e72 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e20-6 (SSLB) - e72-2 (SISR) Always Below 1 Ω
      e20-18 (SGND) - e72-3 (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

    Result:  OK

    OK 

    REPLACE FRONT POWER SEAT SWITCH RH 

    (Refer to DISASSEMBLY [09/2015 - ] )

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (POWER SEAT MOTOR) 
    1. Remove the lumbar support adjuster assembly RH (Refer to REMOVAL [09/2015 - ] ).
    2. Inspect the lumbar support adjuster assembly RH (Refer to INSPECTION [09/2015 - ] ).

    Result:  NG

    NG 

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  OK

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POWER SEAT MOTOR) 
    1. Disconnect the e18 switch connector.
      GTY682048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e72 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e18-10 (L+) - e72-5 (H1) Always Below 1 Ω
      e18-1 (L-) - e72-6 (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

    Result:  OK

    OK 

    REPLACE FRONT POWER SEAT SWITCH RH 

    (Refer to DISASSEMBLY [09/2015 - ] )

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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