2010 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE

DTC B2654: Headrest Sensor Malfunction: Procedure

  1. CHECK FOR DTC 
    1. Check for DTCs.
      1. Using the Techstream, check which ECU output the DTC.
        RESULT

        Result Proceed to
        B2654 output from driver seat ECU A
        B2654 output from passenger seat ECU B

    B → See step   9 

    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.
      DRIVER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Headrest Operation Seat headrest operation UP / DOWN -

      OK

      Motor operates normally.

    NG → See step   7 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT HEADREST MOTOR LH) 
    1. Disconnect the e46 switch connector.
      Fig 1: Checking Harness And Connector (Front Power Seat Switch LH - Front Headrest Motor LH)
      GTY116699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e53 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK FRONT POWER SEAT SWITCH LH 
    1. Disconnect the e53 motor connector.
      Fig 2: Identifying e53 Motor Connector Terminals
      GTY117028Courtesy 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
      e53-2 (VCC) - e53-3 (GND) Headrest switch signal ON 7.2 to 8.8 V

    NG → See step   24 

    OK: Go to next step 

  5. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR) 
    1. Reconnect the e53 motor connector.
      Fig 3: Identifying e53 Motor Connector Terminals
      GTY288887Courtesy 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
      e53-4 (O/P) - Body ground Headrest switch signal ON 0 to 8 V

    NG → See step   25 

    OK: Go to next step 

  6. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Recheck for DTCs.

      OK

      DTC B2654 is not output.

    NG → See step   24 

    OK → END (SYSTEM RETURNS TO NORMAL) 

  7. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) 
    1. Check the operation of the power seat motor (headrest motor).
      Fig 4: Identifying Power Seat Motor Connector Terminals
      GTY117468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Check if the seat headrest adjuster moves smoothly when the battery is connected to the headrest motor connector terminals.

        OK

        Measurement Condition Operation Direction
        Battery positive (+) → 1
        Battery negative (-) → 5        		 Seat headrest adjuster moves upward
        Battery positive (+) → 5
        Battery negative (-) → 1        		 Seat headrest adjuster moves downward

    NG → See step   25 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT HEADREST MOTOR LH) 
    1. Disconnect the e45 switch connector.
      Fig 5: Checking Harness And Connector (Front Power Seat Switch LH - Front Headrest Motor LH)
      GTY116928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e53 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   24 

  9. CHECK VEHICLE 
    1. Check the type of headrest.
      RESULT

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

    B → See step   17 

    A: Go to next step 

  10. 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.
      PASSENGER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Headrest Operation Seat headrest operation UP / DOWN -

      OK

      Motor operates normally.

    NG → See step   15 

    OK: Go to next step 

  11. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT HEADREST POSITION SENSOR RH) 
    1. Disconnect the e20 switch connector.
      Fig 6: Checking Harness And Connector (Front Power Seat Switch RH - Front Headrest Position Sensor RH)
      GTY116801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e23 sensor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e20-8 (PVCC) - e23-3 (VCC) Always Below 1 Ω
      e20-21 (SSRH) - e23-1 (O/P) Always Below 1 Ω
      e20-18 (SGND) - e23-2 (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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  12. CHECK FRONT POWER SEAT SWITCH RH 
    1. Disconnect the e23 sensor connector.
      Fig 7: Identifying e23 Sensor Connector Terminals
      GTY126347Courtesy 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
      e23-3 (VCC) - e23-2 (GND) Headrest switch signal ON 7.2 to 8.8 V

    NG → See step   26 

    OK: Go to next step 

  13. CHECK FRONT SEAT HEADREST ADJUSTER (POSITION CONTROL SENSOR) 
    1. Reconnect the e23 sensor connector.
      Fig 8: Identifying e23 Sensor Connector Terminals
      GTY279567Courtesy 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
      e23-1 (O/P) - Body ground Headrest switch signal ON 0 to 8 V

    NG → See step   27 

    OK: Go to next step 

  14. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Recheck for DTCs.

      OK

      DTC B2654 is not output.

    NG → See step   26 

    OK → END (SYSTEM RETURNS TO NORMAL) 

  15. CHECK POWER SEAT MOTOR ASSEMBLY 
    1. Check the operation of the power seat motor (headrest motor).
      Fig 9: Identifying Power Seat Motor Connector Terminals
      GTY116627Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Check if the seat headrest adjuster moves smoothly when the battery is connected to the headrest motor connector terminals.

        OK

        Measurement Condition Operation Direction
        Battery positive (+) → 1
        Battery negative (-) → 2        		 Seat headrest adjuster moves upward
        Battery positive (+) → 2
        Battery negative (-) → 1        		 Seat headrest adjuster moves downward

    NG → See step   28 

    OK: Go to next step 

  16. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POWER SEAT MOTOR) 
    1. Disconnect the e18 switch connector.
      Fig 10: Checking Harness And Connector (Front Power Seat Switch RH - Power Seat Motor)
      GTY116930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e26 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e18-11 (H+) - e26-1 Always Below 1 Ω
      e18-8 (H-) - e26-2 Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   26 

  17. 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.
      PASSENGER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Headrest Operation Seat headrest operation UP / DOWN -

      OK

      Motor operates normally.

    NG → See step   22 

    OK: Go to next step 

  18. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT HEADREST MOTOR RH) 
    1. Disconnect the e20 switch connector.
      Fig 11: Checking Harness And Connector (Front Power Seat Switch RH - Front Headrest Motor RH)
      GTY286247Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e25 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e20-8 (PVCC) - e25-4 (VCC) Always Below 1 Ω
      e20-21 (SSRH) - e25-2 (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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  19. CHECK FRONT POWER SEAT SWITCH RH 
    1. Disconnect the e25 sensor connector.
      Fig 12: Identifying e25 Sensor Connector Terminals
      GTY257307Courtesy 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
      e25-4 (VCC) - e25-3 (GND) Headrest switch signal ON 7.2 to 8.8 V

    NG → See step   26 

    OK: Go to next step 

  20. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POSITION CONTROL SENSOR) 
    1. Reconnect the e25 sensor connector.
      Fig 13: Identifying e25 Sensor Connector Terminals
      GTY277069Courtesy 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
      e25-2 (O/P) - Body ground Headrest switch signal ON 0 to 8 V

    NG → See step   25 

    OK: Go to next step 

  21. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Recheck for DTCs.

      OK

      DTC B2654 is not output.

    NG → See step   26 

    OK → END (SYSTEM RETURNS TO NORMAL) 

  22. CHECK FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) 
    1. Check the operation of the power seat motor (headrest motor).
      Fig 14: Identifying Power Seat Motor Connector Terminals
      GTY117468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Check if the seat headrest adjuster moves smoothly when the battery is connected to the headrest motor connector terminals.

        OK

        Measurement Condition Operation Direction
        Battery positive (+) → 5
        Battery negative (-) → 1        		 Seat headrest adjuster moves upward
        Battery positive (+) → 1
        Battery negative (-) → 5        		 Seat headrest adjuster moves downward

    NG → See step   25 

    OK: Go to next step 

  23. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT HEADREST MOTOR RH) 
    1. Disconnect the e18 switch connector.
      Fig 15: Checking Harness And Connector (Front Power Seat Switch RH - Front Headrest Motor RH)
      GTY254351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e25 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e18-11 (H+) - e25-5 (UP) Always Below 1 Ω
      e18-8 (H-) - e25-1 (DOWN) Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   26 

  24. REPLACE FRONT POWER SEAT SWITCH LH. Refer to  DISASSEMBLY 
  25. REPLACE FRONT SEAT HEADREST ADJUSTER SUB-ASSEMBLY. Refer to  DISASSEMBLY 
  26. REPLACE FRONT POWER SEAT SWITCH RH. Refer to  DISASSEMBLY 
  27. REPLACE FRONT SEAT HEADREST ADJUSTER. Refer to  DISASSEMBLY 
  28. REPLACE POWER SEAT MOTOR ASSEMBLY. Refer to  DISASSEMBLY 
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