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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 B2653 Lifter 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
    B2653 output from driver seat ECU A
    B2653 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
        LIFTER Seat lifter operation UP / OFF / DOWN -
      2. Techstream

        Driver Seat 

    DRIVER SEAT REFERENCE

    Tester Display Test Part Control Range Diagnostic Note
    Lifter Operation Seat lifter operation Up / OFF / Down -

    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 e43 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) - e43-3 (VCC) Always Below 1 Ω
    e46-9 (SSRV) - e43-1 (0/ P) Always Below 1 Ω
    e46-18 (SGND) - e43-2 (GND) Always Below 1 Ω
    e46-8 (PVCC) - Body ground Always 10 kΩ or higher
    e46-9 (SSRV) - 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 E43 Sensor Connectors
    G05784828Courtesy 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 e43 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
    e43-3 (VCC) - e43-2 (GND) Lifter switch signal ON 7 2 to 8.8 V
    Fig 2: Identifying Terminals Of E43 Sensor Connector
    G05784829Courtesy 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 e43 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
    e43-1 (O/P) - Body ground Lifter switch signal ON 0 to 8 V
    Fig 3: Identifying Terminals Of E43 Sensor Connector
    G05784830Courtesy 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 B2653 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 (lifter motor).
      1. Check if the seat adjuster moves smoothly when the battery is connected to the lifter motor connector terminals

      OK 

    TERMINALS REFERENCE CHART

    Measurement Condition Operational Direction
    Battery positive (+) → 2
    Battery negative (-) → 1    		 Upward
    Battery negative (-) → 1
    Battery positive (+) → 2    		 Downward
    Fig 4: Identifying Terminals Of Power Seat Motor Connector
    G05784831Courtesy 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 e45 and e46 switch connectors.
    2. Disconnect the e44 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
    e46-2 (RRV+) - e44-2 Always Below 1 Ω
    e45-5 (RRV-) - e44-1 Always Below 1 Ω
    Fig 5: Identifying Terminals Of E44 Motor, E45 And E46 Switch Connectors
    G05784832Courtesy 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
        LIFTER Seat lifter operation UP / OFF / DOWN -
      2. Techstream

        Passenger Seat 

    PASSENGER SEAT REFERENCE

    Tester Display Test Part Control Range Diagnostic Note
    Lifter Operation Seat lifter operation Up / OFF / Down -

    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 e28 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) - e28-3 (VCC) Always Below 1 Ω
    e20-9 (SSRL) - e28-1 (0/ P) Always Below 1 Ω
    e20-18 (SGND) - e28-2 (GND) Always Below 1 Ω
    e20-8 (PVCC) - Body ground Always 10 kΩ or higher
    e20-9 (SSRL) - 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 E28 Sensor Connectors
    G05784833Courtesy 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 e28 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
    e28-3 (VCC) - e28-2 (GND) Lifter switch signal ON 7 2 to 8.8 V
    Fig 7: Identifying Terminals Of E28 Sensor Connector
    G05784834Courtesy 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 e28 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
    e28-1 (O/P) - Body ground Lifter switch signal ON 0 to 8 V
    Fig 8: Identifying Terminals Of E28 Sensor Connector
    G05784835Courtesy 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 B2653 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 (lifter motor)
      1. Check if the seat adjuster moves smoothly when the battery is connected to the lifter motor connector terminals.

        OK 

    TERMINALS REFERENCE CHART

    Measurement Condition Operational Direction
    Battery positive (+) → 1
    Battery negative (-) → 2    		 Upward
    Battery negative (-) → 2
    Battery positive (+) → 1    		 Downward
    Fig 9: Identifying Terminals Of Power Seat Motor Connector
    G05784836Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to Next Step 

  15. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POWER SEAT MOTOR) 
    1. Disconnect the e18 and e20 switch connectors.
    2. Disconnect the e8 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
    e20-2 (RRV+) - e8-1 Always Below 1 Ω
    e18-5 (RRV-) - e8-2 Always Below 1 Ω
    Fig 10: Identifying Terminals Of E8 Motor, E18 And E20 Switch Connectors
    G05784837Courtesy 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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