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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis >> External Pages >> Different car >> Section 182 (Seats - Front Power Seat Control System Description And Diagnostics) >> Front Power Seat Control System >> DTC B2651 Reclining Sensor Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  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 USING 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 

        D-SEAT REFERENCE

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

        Driver Seat 

    DRIVER SEAT REFERENCE

    Tester Display Test Part Control Range Diagnostic Note
    Seat Reclining Seat reclining operation Front / OFF / 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) 
    1. Disconnect the e46 switch connector.
    2. Disconnect the e48 sensor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    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
    Fig 1: Identifying Terminals Of E46 Switch And E48 Sensor Connectors
    G05784810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 value(s) in the table below.

      Standard Voltage 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    e48-3 (VCC) - e48-2 (GND) Reclining switch signal ON 7 2 to 8.8 V
    Fig 2: Identifying Terminals Of E48 Sensor Connector
    G05784811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to Next Step 

  5. CHECK FRONT SEAT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR) 
    1. Reconnect the e48 sensor connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    e48-1 (O/P) - Body ground Reclining switch signal ON 0 to 8 V
    Fig 3: Identifying Terminals Of E48 Sensor Connector
    G05784812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to Next Step 

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

      OK: DTC B2651 is not output. 

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

      OK: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

  7. CHECK FRONT SEAT ADJUSTER ASSEMBLY LH (POWER SEAT MOTOR) 
    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 

    TERMINALS REFERENCE CHART

    Measurement Condition Operational Direction
    Battery positive (+) → 2
    Battery negative (-) → 1    		 Forward
    Battery positive (+) → 1
    Battery negative (-) → 2    		 Backward
    Fig 4: Identifying Terminals Of Power Seat Motor Connector
    G05784813Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to Next Step 

  8. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR) 
    1. Disconnect the e46 and e45 switch connectors.
    2. Disconnect the e47 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    e46-3 (RCL+) - e47-2 Always Below 1 Ω
    e45-3 (RCL-) - e47-1 Always Below 1 Ω
    Fig 5: Identifying Terminals Of E47, E46 And E45 Switch Connectors
    G05784814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  9. PERFORM ACTIVE TEST USING 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 

        P-SEAT REFERENCE

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

        Passenger Seat 

    PASSENGER SEAT REFERENCE

    Tester Display Test Part Control Range Diagnostic Note
    Seat Reclining Seat reclining operation Front / OFF / 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) 
    1. Disconnect the e20 switch connector.
    2. Disconnect the e15 sensor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    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
    Fig 6: Identifying Terminals Of E20 Switch And E15 Sensor Connectors
    G05784815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  11. CHECK FRONT SEAT ADJUSTER ASSEMBLY RH (POSITION CONTROL SENSOR) 
    1. Disconnect the e15 sensor connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    e15-3 (VCC) - e15-2 (GND) Reclining switch signal ON 7.2 to 8.8 V
    Fig 7: Identifying Terminals Of E15 Sensor Connector
    G05784816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to Next Step 

  12. CHECK FRONT SEAT ADJUSTER ASSEMBLY RH (POSITION CONTROL SENSOR) 
    1. Reconnect the e15 sensor connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    e15-1 (O/P) - Body ground Reclining switch signal ON 0 to 8 V
    Fig 8: Identifying Terminals Of E15 Sensor Connector
    G05784817Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to Next Step 

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

      OK: DTC B2651 is not output. 

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

      OK: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

  14. CHECK FRONT SEAT ADJUSTER ASSEMBLY RH (POWER SEAT MOTOR) 
    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 

    TERMINALS REFERENCE CHART

    Measurement Condition Operational Direction
    Battery positive (+) → 2
    Battery negative (-) → 1    		 Forward
    Battery positive (+) → 1
    Battery negative (-) → 2    		 Backward
    Fig 9: Identifying Terminals Of Power Seat Motor Connector
    G05784818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to Next Step 

  15. CHECK HARNESS AND CONNECTOR (POWER SEAT SWITCH RH - POWER SEAT MOTOR) 
    1. Disconnect the e18 and e20 switch connectors.
    2. Disconnect the e14 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    e20-3 (RCL+) - e14-2 Always Below 1 Ω
    e18-3 (RCL-) - e14-1 Always Below 1 Ω
    Fig 10: Identifying Terminals Of E18 And E20 Switch Connectors
    G05784819Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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