2013 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE

DTC B265B: Lumbar Support Sensor Circuit: 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 [09/2012 - ] .
        RESULT

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

    B → See step   8 

    A: Go to next step 

  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 [09/2012 - ] .
      DRIVER SEAT

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

      OK

      Motor operates normally.

    NG → See step   6 

    OK: Go to next step 

  3. CHECK FRONT POWER SEAT SWITCH LH (POSITION CONTROL SENSOR) 
    1. Disconnect the e77 motor connector.
      GTY400128Courtesy 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

    NG → See step   5 

    OK: Go to next step 

  4. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY419759Courtesy 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

    NG → See step   15 

    OK → See step   18 

  5. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR) 
    1. Disconnect the e46 switch connector.
      GTY406131Courtesy 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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   19 

  6. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (POWER SEAT MOTOR) 
    1. Remove the lumbar support adjuster assembly LH. Refer to REMOVAL [09/2012 - ] .
    2. Inspect the lumbar support adjuster assembly LH. Refer to INSPECTION [09/2012 - ] .

    NG → See step   16 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR) 
    1. Disconnect the e45 switch connector.
      GTY403449Courtesy 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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   20 

  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 [09/2012 - ] .
      PASSENGER SEAT

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

      OK

      Motor operates normally.

    NG → See step   12 

    OK: Go to next step 

  9. CHECK FRONT POWER SEAT SWITCH RH (LUMBAR MOTOR CIRCUIT) 
    1. Disconnect the e72 motor connector.
      GTY416943Courtesy 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

    NG → See step   11 

    OK: Go to next step 

  10. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (LUMBAR MOTOR) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY413691Courtesy 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

    NG → See step   17 

    OK → See step   21 

  11. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - LUMBAR SUPPORT ADJUSTER ASSEMBLY RH) 
    1. Disconnect the e20 switch connector.
      GTY406035Courtesy 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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   22 

  12. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (POWER SEAT MOTOR) 
    1. Remove the lumbar support adjuster assembly RH. Refer to REMOVAL [09/2012 - ] .
    2. Inspect the lumbar support adjuster assembly RH. Refer to INSPECTION [09/2012 - ] .

    NG → See step   23 

    OK: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POWER SEAT MOTOR) 
    1. Disconnect the e18 switch connector.
      GTY403448Courtesy 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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   14 

  14. REPLACE FRONT POWER SEAT SWITCH RH. Refer to  DISASSEMBLY [09/2012 - ] 
  15. REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (LUMBAR MOTOR). Refer to  REMOVAL [09/2012 - ] 
  16. REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH. Refer to  REMOVAL [09/2012 - ] 
  17. REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH. Refer to  REMOVAL [09/2012 - ] 
  18. REPLACE FRONT POWER SEAT SWITCH LH. Refer to  DISASSEMBLY [09/2012 - ] 
  19. REPLACE FRONT POWER SEAT SWITCH LH. Refer to  DISASSEMBLY [09/2012 - ] 
  20. REPLACE FRONT POWER SEAT SWITCH LH. Refer to  DISASSEMBLY [09/2012 - ] 
  21. REPLACE FRONT POWER SEAT SWITCH RH. Refer to  DISASSEMBLY [09/2012 - ] 
  22. REPLACE FRONT POWER SEAT SWITCH RH. Refer to  DISASSEMBLY [09/2012 - ] 
  23. REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH. Refer to  REMOVAL [09/2012 - ] 
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