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Home › Lexus › 2009 › LS 460 AWD › Repair and Diagnosis › Body & Frame › Seats › Seat › Front Power Seat Control System › DTC B2653 Lifter Sensor Malfunction › Inspection Procedure

Inspection Procedure

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

        Result 

        RESULT CHART

        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 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 

      DIAGNOSTIC NOTE

      Tester Display Test Part Control Range Diagnostic Note
      Lifter Operation Seal lifter operation UP/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 (O/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: Checking Harness And Connector (Front Power Seat Switch LH - Front Power Seat Position Sensor LH)
      G04952454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step 

  4. CHECK FRONT POWER SEAT SWITCH LH 
    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 Switch Condition Specified Condition
      e43-3 (VCC) - e43-2 (GND) Lifter switch signal ON 7.2 to 8.8 V
      Fig 2: Identifying e43 Sensor Connector Terminals
      G04952455Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      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 Switch Condition Specified Condition
      e43-1 (O/P) - Body ground Lifter switch signal ON 0 to 8 V
      Fig 3: Identifying e43 Sensor Connector Terminals
      G06194162Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      OK: Go to next step 

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

      OK: 

      DTC B2653 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) 
    1. Check the 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 

        MEASUREMENT CONDITION CHART

        Measurement Condition Operation Direction
        Battery positive (+) → 2
        Battery negative (-) → 1        		 Seat adjuster moves upward
        Battery negative (-) → 1
        Battery positive (+) → 2        		 Seat adjuster moves downward
        Fig 4: Identifying Power Seat Motor Connector Terminals
        G04952427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

        OK 

  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: Checking Harness And Connector (Front Power Seat Switch LH - Power Seat Motor)
      G04952458Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  9. 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 

      DIAGNOSTIC NOTE

      Tester Display Test Part Control Range Diagnostic Note
      Lifter Operation Seat lifter operation UP/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: Checking Harness And Connector (Front Power Seat Switch RH - Front Power Seat Position Sensor RH)
      G06194165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step 

  11. CHECK FRONT POWER SEAT SWITCH RH 
    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 Switch Condition Specified Condition
      e28-3 (VCC) - e28-2 (GND) Lifter switch signal ON 7.2 to 8.8 V
      Fig 7: Identifying e28 Sensor Connector Terminals
      G04952460Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      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 Switch Condition Specified Condition
      e28-1 (O/P) - Body ground Lifter switch signal ON 0 to 8 V
      Fig 8: Identifying e28 Sensor Connector Terminals
      G06194167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      OK: Go to next step 

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

      OK: 

      DTC B2653 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) 
    1. Check the 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 

        MEASUREMENT CONDITION CHART

        Measurement Condition Operation Direction
        Battery positive (+) → 1
        Battery negative (-) → 2        		 Seat adjuster moves upward
        Battery negative (-) → 2
        Battery positive (+) → 1        		 Seat adjuster moves downward
        Fig 9: Identifying Power Seat Motor Connector Terminals
        G04952427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

        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 (RUP) - e8-1 Always Below 1 Ω
      e18-5 (RDWN) - e8-2 Always Below 1 Ω
      Fig 10: Checking Harness And Connector (Front Power Seat Switch RH - Power Seat Motor)
      G06194169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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