FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2653

DTC Code DTC Name
B2653 Lifter Sensor Malfunction

DESCRIPTION

When the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat) does not receive a sensor signal despite upward or downward movement of the seat cushion by power seat motor operation, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2653 Lifter Sensor Malfunction The upward and downward lock detection position of the sensor is the same.

  • Position control ECU and switch assembly (driver seat)

  • Lifter motor (Front seat adjuster assembly (driver seat))

  • Position control ECU and switch assembly (front passenger seat)

  • Lifter motor (Front seat adjuster assembly (front passenger seat))

  • Wire harness or connector

WIRING DIAGRAM


  1. for Driver Seat

    B00757CE07

  2. for Front Passenger Seat

    B00757CE08

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Driver Seat > Clear DTCs
      Body Electrical > Passenger Seat > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Driver Seat > Trouble Codes
      Body Electrical > Passenger Seat > Trouble Codes
      OK
      DTC B2653 is not output.
      Result
      Result Proceed to
      DTC B2653 is not output A
      DTC B2653 output from "Driver Seat" B
      DTC B2653 output from "Front Passenger Seat" C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    PERFORM ACTIVE TEST USING GTS (LIFTER MOTOR) Click here

    B

  3. PERFORM ACTIVE TEST USING GTS (LIFTER MOTOR)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Driver Seat / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Driver Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Lifter Operation Seat lifter operation OFF/Rear/Front -

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Lifter Operation
      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT)) Click here

    OK

  4. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) (LIFTER MOTOR CIRCUIT)


    1. Disconnect the b2*1 or a3*2 lifter motor (front seat adjuster assembly (driver seat)) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      b2-2 - b2-3 Lifter switch on 4.8 to 5.1 V
      for RHD
      Tester Connection Condition Specified Condition
      a3-2 - a3-3 Lifter switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) - LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT))) Click here

    OK

  5. CHECK LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT))


    1. B00744UC09
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

      (Lifter Motor (Front Seat Adjuster Assembly (Driver Seat))

      Reconnect the b2*1 or a3*2 lifter motor (front seat adjuster assembly (driver seat)) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      b2-2 - Body ground Lifter motor operating 4.5 to 4.8 V
      for RHD
      Tester Connection Condition Specified Condition
      a3-2 - Body ground Lifter motor operating 4.5 to 4.8 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPLACE SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT)) Click here

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) - LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT)))


    1. Disconnect the b5*1 or a5*2 position control ECU and switch assembly (driver seat) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b5-4 (SSRL) - b2-2 Always Below 1 Ω
      b5-4 (SSRL) or b2-2 - Body ground Always 10 kΩ or higher
      b5-1 (SGND) - b2-3 Always Below 1 Ω
      b5-1 (SGND) or b2-3 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a5-4 (SSRL) - a3-2 Always Below 1 Ω
      a5-4 (SSRL) or a3-2 - Body ground Always 10 kΩ or higher
      a5-1 (SGND) - a3-3 Always Below 1 Ω
      a5-1 (SGND) or a3-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT))


    1. Remove the front seat adjuster assembly (driver seat).

      Click here

    2. Inspect the front seat adjuster assembly (driver seat) (lifter motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT)) Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) - LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT)))


    1. Disconnect the b4*1 or a4*2 position control ECU and switch assembly (driver seat) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b4-10 (LFT+) - b2-4 Always Below 1 Ω
      b4-10 (LFT+) or b2-4 - Body ground Always 10 kΩ or higher
      b4-12 (LFT-) - b2-1 Always Below 1 Ω
      b4-12 (LFT-) or b2-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a4-10 (LFT+) - a3-4 Always Below 1 Ω
      a4-10 (LFT+) or a3-4 - Body ground Always 10 kΩ or higher
      a4-12 (LFT-) - a3-1 Always Below 1 Ω
      a4-12 (LFT-) or a3-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. PERFORM ACTIVE TEST USING GTS (LIFTER MOTOR)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Passenger Seat / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Passenger Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Lifter Operation Seat lifter operation OFF/Rear/Front -

      Body Electrical > Passenger Seat > Active Test
      Tester Display
      Lifter Operation
      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASSENGER SEAT)) Click here

    OK

  10. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) (SLIDE MOTOR CIRCUIT)


    1. Disconnect the a3*1 or b2*2 lifter motor (front seat adjuster assembly (front passenger seat)) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      a3-2 - a3-3 Lifter switch on 4.8 to 5.1 V
      for RHD
      Tester Connection Condition Specified Condition
      b2-2 - b2-3 Lifter switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) - LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASS) Click here

    OK

  11. CHECK LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASSENGER SEAT))


    1. B00744UC10
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

      (Lifter Motor (Front Seat Adjuster Assembly (Front Passenger Seat))

      Reconnect the a3*1 or b2*2 lifter motor (front seat adjuster assembly (front passenger seat)) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      a3-2 - Body ground Lifter motor operating 4.5 to 4.8 V
      for RHD
      Tester Connection Condition Specified Condition
      b2-2 - Body ground Lifter motor operating 4.5 to 4.8 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) Click here

    NG

    REPLACE LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASSENGER SEAT)) Click here

  12. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) - LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASS)


    1. Disconnect the a5*1 or b5*2 position control ECU and switch assembly (front passenger seat) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      a5-4 (SSRL) - a3-2 Always Below 1 Ω
      a5-4 (SSRL) or a3-2 - Body ground Always 10 kΩ or higher
      a5-1 (SGND) - a3-3 Always Below 1 Ω
      a5-1 (SGND) or a3-3 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      b5-4 (SSRL) - b2-2 Always Below 1 Ω
      b5-4 (SSRL) or b2-2 - Body ground Always 10 kΩ or higher
      b5-1 (SGND) - b2-3 Always Below 1 Ω
      b5-1 (SGND) or b2-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. INSPECT LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASSENGER SEAT))


    1. Remove the front seat adjuster assembly (front passenger seat).

      Click here

    2. Inspect the front seat adjuster assembly (front passenger seat) (lifter motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASSENGER SEAT)) Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) - LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASS)


    1. Disconnect the a4*1 or b4*2 position control ECU and switch assembly (front passenger seat) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      a4-10 (LFT+) - a3-4 Always Below 1 Ω
      a4-10 (LFT+) or a3-4 - Body ground Always 10 kΩ or higher
      a4-12 (LFT-) - a3-1 Always Below 1 Ω
      a4-12 (LFT-) or a3-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      b4-10 (LFT+) - b2-4 Always Below 1 Ω
      b4-10 (LFT+) or b2-4 - Body ground Always 10 kΩ or higher
      b4-12 (LFT-) - b2-1 Always Below 1 Ω
      b4-12 (LFT-) or b2-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR