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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Body & Frame >> Seats >> Seats - Front Power Seat Control System >> Front Power Seat Control System >> DTC B2651 Reclining Sensor Malfunction >> Inspection Procedure
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Inspection Procedure

  1. CHECK FOR DTC 
    1. DTC output area check
      1. Using the intelligent tester or Techstream, determine the area that output the DTC.

        Result 

        RESULT REFERENCE

        Result Proceed to
        B2651 output from driver seat ECU A
        B2651 output from passenger seat ECU B

    B: Go to step   9 

    A: GO TO NEXT STEP 

  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER OR TECHSTREAM (POWER SEAT MOTOR FUNCTION) 
    1. Select the ACTIVE TEST, use the intelligent tester or Techstream to generate a control command, and then check the power seat motor function.
      1. Intelligent tester

        D-SEAT 

        INTELLIGENT TESTER - D-SEAT REFERENCE

        Tester Display Test Part Control Range
        RECLINING Seat reclining operation FRONT/REAR
      2. Techstream

        Driver Seat 

        TECHSTREAM - DRIVER SEAT REFERENCE

        Tester Display Test Part Control Range
        Seat Reclining Seat reclining operation FRONT/REAR

        OK: Motor operates normally 

    NG: Go to step   7 

    OK: GO TO NEXT STEP 

  3. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT POWER SEAT POSITION SENSOR LH AND BODY GROUND) 
      Fig 1: Identifying e46 Connector Terminals
      G04952436Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e46 switch connector.
    2. Disconnect the e48 sensor connector.
    3. Measure the resistance according to the values in the table below.

      Standard resistance 

      FRONT POWER SEAT SWITCH LH - FRONT POWER SEAT POSITION SENSOR LH AND BODY GROUND

      Tester Connection Condition Specified Condition
      e46-8 (PVCC) - e48-3 (VCC) Always Below 1 Ω
      e46-22 (SSRR) - e48-1 (O/P) Always Below 1 Ω
      e46-18(SGND) - e48-2 (GND) Always Below 1 Ω
      e46-8 (PVCC) - Body ground Always 10 kΩ or higher
      e46-22 (SSRR) - 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 SEAT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR) 
    1. Disconnect the e48 sensor connector.
    2. Measure the voltage according to the values in the table below.
      Fig 2: Identifying e48 Connector Terminals
      G04952437Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      FRONT SEAT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR)

      Tester Connection Switch Condition Specified Condition
      e48-3 (VCC) - e48-2 (GND) Reclining switch signal ON 7.2 to 8.8 V

    NG: REPLACE FRONT POWER SEAT SWITCH LH (See  REMOVAL  ) 

    OK: GO TO NEXT STEP 

  5. CHECK FRONT SEAT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR) 
      Fig 3: Identifying e48 Sensor Connector Terminal O/P
      G04952438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Reconnect the e48 sensor connector.
    2. Measure the voltage according to the value in the table below.

      Standard voltage 

      FRONT SEAT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR)

      Tester Connection Switch Condition Specified Condition
      e48-1 (O/P) - Body ground Reclining switch signal ON 0 to 8V

    NG: REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH (See  REMOVAL  ) 

    OK: GO TO NEXT STEP 

  6. CHECK FOR DTC 
    1. Clear the DTC (see DTC CHECK / CLEAR  ).
    2. Recheck the DTC.

      OK: DTC B2651 is not output. 

    NG: REPLACE FRONT POWER SEAT SWITCH LH (See  REMOVAL  ) 

    OK: END (SYSTEM RETURNS TO NORMAL) 

  7. CHECK FRONT SEAT ADJUSTER ASSEMBLY LH (POWER SEAT MOTOR) 
      Fig 4: Identifying Power Seat Motor Connector Terminals
      G04952427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check operation of the power seat motor (reclining motor).
      1. Check if the seat adjuster moves smoothly when the battery is connected to the reclining motor connector terminals.

        OK 

        FRONT SEAT ADJUSTER ASSEMBLY LH (POWER SEAT MOTOR)

        Measurement Condition Operational Direction
        Battery positive (+) → 2
        Battery negative (-) → 1        		 Forward
        Battery positive (+) → 1
        Battery negative (-) → 2        		 Backward

    NG: REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH (See  REMOVAL  ) 

    OK: GO TO NEXT STEP 

  8. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR) 
      Fig 5: Identifying E46 And E45 Switch Connectors Terminals
      G04952440Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e46 and e45 switch connectors.
    2. Disconnect the e47 motor connector.
    3. Measure the resistance according to the values in the table below.

      Standard resistance 

      FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR

      Tester Connection Condition Specified Condition
      e46-3 (RCL+) - e47-2 Always Below 1 Ω
      e45-3 (RCL-) - e47-1 Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE FRONT POWER SEAT SWITCH LH (See  REMOVAL  ) 

  9. PERFORM ACTIVE TEST BY INTELLIGENT TESTER OR TECHSTREAM (POWER SEAT MOTOR FUNCTION) 
    1. Select the ACTIVE TEST, use the intelligent tester or Techstream to generate a control command, and then check the power seat motor function.
      1. Intelligent tester

        P-SEAT 

        INTELLIGENT TESTER - P-SEAT REFERENCE

        Tester Display Test Part Control Range
        RECLINING Seat reclining operation FRONT/REAR
      2. Techstream

        Passenger Seat 

        TECHSTREAM - PASSENGER SEAT REFERENCE

        Tester Display Test Part Control Range
        Seat Reclining Seat reclining operation FRONT/REAR

        OK: Motor operates normally 

    NG: Go to step   14 

    OK: GO TO NEXT STEP 

  10. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT POWER SEAT POSITION SENSOR RH AND BODY GROUND) 
      Fig 6: Identifying e20 And e15 Connector Terminals
      G04952441Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e20 switch connector.
    2. Disconnect the e15 sensor connector.
    3. Measure the resistance according to the values in the table below.

      Standard resistance 

      FRONT POWER SEAT SWITCH RH - FRONT POWER SEAT POSITION SENSOR RH AND BODY GROUND

      Tester Connection Condition Specified Condition
      e20-8 (PVCC) - e15-3 (VCC) Always Below 1 Ω
      e20-22 (SSRR) - e15-1 (O/P) Always Below 1 Ω
      e20-18(SGND) - e15-2 (GND) Always Below 1 Ω
      e20-8 (PVCC) - Body ground Always 10 kΩ or higher
      e20-22 (SSRR) - 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 

  11. CHECK FRONT SEAT ADJUSTER ASSEMBLY RH (POSITION CONTROL SENSOR) 
      Fig 7: Identifying e15 Connector Terminals
      G04952442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e15 sensor connector.
    2. Measure the voltage according to the values in the table below.

      Standard voltage 

      FRONT SEAT ADJUSTER ASSEMBLY RH (POSITION CONTROL SENSOR)

      Tester Connection Switch Condition Specified Condition
      e15-3(VCC) - e15-2 (GND) Reclining switch signal ON 7.2 to 8.8 V

    NG: REPLACE FRONT POWER SEAT SWITCH RH (See  REMOVAL  ) 

    OK: GO TO NEXT STEP 

  12. CHECK FRONT SEAT ADJUSTER ASSEMBLY RH (POSITION CONTROL SENSOR) 
      Fig 8: Identifying e15 Sensor Connector Terminal O/P
      G04952443Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Reconnect the e15 sensor connector.
    2. Measure the voltage according to the value in the table below.

      Standard voltage 

      FRONT SEAT ADJUSTER ASSEMBLY RH (POSITION CONTROL SENSOR)

      Tester Connection Switch Condition Specified Condition
      e15-1 (O/P) - Body ground Reclining switch signal ON 0 to 8V

    NG: REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH (See  REMOVAL  ) 

    OK: GO TO NEXT STEP 

  13. CHECK FOR DTC 
    1. Clear the DTC (see DTC CHECK / CLEAR  ).
    2. Recheck the DTC.

      OK: DTC B2651 is not output. 

    NG: REPLACE FRONT POWER SEAT SWITCH RH (See  REMOVAL  ) 

    OK: END (SYSTEM RETURNS TO NORMAL) 

  14. CHECK FRONT SEAT ADJUSTER ASSEMBLY RH (POWER SEAT MOTOR) 
    Fig 9: Identifying Power Seat Motor Connector Terminals
    G04952427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check operation of the power seat motor (reclining motor).
      1. Check if the seat adjuster moves smoothly when the battery is connected to the reclining motor connector terminals.

        OK 

        FRONT SEAT ADJUSTER ASSEMBLY RH (POWER SEAT MOTOR)

        Measurement Condition Operational Direction
        Battery positive (+) → 2
        Battery negative (-) → 1        		 Forward
        Battery positive (+) → 1
        Battery negative (-) → 2        		 Backward

    NG: REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH (See  REMOVAL  ) 

    OK: GO TO NEXT STEP 

  15. CHECK HARNESS AND CONNECTOR (POWER SEAT SWITCH RH - POWER SEAT MOTOR) 
      Fig 10: Identifying e18 And e20 Switch Connectors Terminals
      G04952445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e18 and e20 switch connectors.
    2. Disconnect the e14 motor connector.
    3. Measure the resistance according to the values in the table below.

      Standard resistance 

      POWER SEAT SWITCH RH - POWER SEAT MOTOR

      Tester Connection Condition Specified Condition
      e20-3 (RCL+) - e14-2 Always Below 1 Ω
      e18-3(RCL-) - e14-1 Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE FRONT POWER SEAT SWITCH RH (See  REMOVAL  ) 

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