2013 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE

DTC B2652: Front Vertical Sensor Malfunction: Procedure

  1. CHECK FOR DTC 
    1. DTC output area check
      1. Using the Techstream, determine the area that output the DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .
        RESULT

        Result Proceed to
        B2652 output from driver seat ECU A
        B2652 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. Refer to DATA LIST / ACTIVE TEST [09/2012 - ] .
      DRIVER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Front Vertical Operation Seat front vertical 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 - POWER SEAT MOTOR) 
    1. Disconnect the e46 switch connector.
      GTY264658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e64 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) - e64-5 (VCC) Always Below 1 Ω
      e46-19 (SSFV) - e64-2 (O/P) Always Below 1 Ω
      e46-18 (SGND) - e64-6 (GND) Always Below 1 Ω
      e46-8 (PVCC) - Body ground Always 10 kΩ or higher
      e46-19 (SSFV) - 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 e64 motor connector.
      GTY285784Courtesy 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
      e64-5 (VCC) - e64-6 (GND) Front vertical switch ON 7.2 to 8.8 V

    NG → See step   16 

    OK: Go to next step 

  5. CHECK FRONT SEAT ADJUSTER ASSEMBLY LH (POSITION CONTROL SENSOR) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY254685Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      e64-2 (O/P) - Body ground Front vertical switch ON 0 to 8 V

    NG → See step   17 

    OK: Go to next step 

  6. CHECK FOR DTC 
    1. Clear the DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .
    2. Recheck the DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .

      OK

      DTC B2652 is not output.

    NG → See step   16 

    OK → END (SYSTEM RETURNS TO NORMAL) 

  7. INSPECT FRONT SEAT ADJUSTER ASSEMBLY LH (POWER SEAT MOTOR) 
    1. Check operation of the power seat motor (front vertical motor).
      GTY262269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Check if the seat adjuster moves smoothly when the battery is connected to the front vertical motor connector terminals.

        OK

        Measurement Condition Operational Direction
        Battery positive (+) → 3
        Battery negative (-) → 4        		 Upward
        Battery positive (+) → 4
        Battery negative (-) → 3        		 Downward

    NG → See step   17 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR) 
    1. Disconnect the e45 and e46 switch connectors.
      GTY266429Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e64 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e46-1 (FRV+) - e64-3 (UP) Always Below 1 Ω
      e45-12 (FRV-) - e64-4 (DOWN) Always Below 1 Ω
      e46-1 (FRV+) - Body ground Always 10 kΩ or higher
      e45-12 (FRV-) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   16 

  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. Refer to DATA LIST / ACTIVE TEST [09/2012 - ] .
      PASSENGER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Front Vertical Operation Seat front vertical operation UP / DOWN -

      OK

      Motor operates normally.

    NG → See step   14 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR) 
    1. Disconnect the e20 switch connector.
      GTY406036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e60 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) - e60-5 (VCC) Always Below 1 Ω
      e20-19 (SSFV) - e60-2 (O/P) Always Below 1 Ω
      e20-18 (SGND) - e60-6 (GND) Always Below 1 Ω
      e20-8 (PVCC) - Body ground Always 10 kΩ or higher
      e20-19 (SSFV) - 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) 
    1. Disconnect the e60 motor connector.
      GTY272498Courtesy 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
      e60-5 (VCC) - e60-6 (GND) Front vertical switch ON 7.2 to 8.8 V

    NG → See step   18 

    OK: Go to next step 

  12. CHECK FRONT SEAT ADJUSTER ASSEMBLY RH (POSITION CONTROL SENSOR) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY281658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      e60-2 (O/P) - Body ground Front vertical switch ON 0 to 8 V

    NG → See step   19 

    OK: Go to next step 

  13. CHECK FOR DTC 
    1. Clear the DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .
    2. Recheck the DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .

      OK

      DTC B2652 is not output.

    NG → See step   18 

    OK → END (SYSTEM RETURNS TO NORMAL) 

  14. INSPECT FRONT SEAT ADJUSTER ASSEMBLY RH (POWER SEAT MOTOR) 
    1. Check operation of the power seat motor (front vertical motor).
      GTY262269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Check if the seat adjuster moves smoothly when the battery is connected to the front vertical motor connector terminals.

        OK

        Measurement Condition Operational Direction
        Battery positive (+) → 4
        Battery negative (-) → 3        		 Upward
        Battery positive (+) → 3
        Battery negative (-) → 4        		 Downward

    NG → See step   19 

    OK: Go to next step 

  15. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - FRONT POWER SEAT POSITION SENSOR) 
    1. Disconnect the e18 and e20 switch connectors.
      GTY266431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e60 motor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e20-1 (FUP) - e60-4 (UP) Always Below 1 Ω
      e18-12 (FDWN) - e60-3 (DOWN) Always Below 1 Ω
      e20-1 (FUP) - Body ground Always 10 kΩ or higher
      e18-12 (FDWN) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   18 

  16. REPLACE FRONT POWER SEAT SWITCH LH. Refer to  DISASSEMBLY [09/2012 - ] 
  17. REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH. Refer to  DISASSEMBLY [09/2012 - ] 
  18. REPLACE FRONT POWER SEAT SWITCH RH. Refer to  DISASSEMBLY [09/2012 - ] 
  19. REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH. Refer to  DISASSEMBLY [09/2012 - ] 
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