FRONT POWER SEAT CONTROL SYSTEM(w/ Memory), Diagnostic DTC:B2653

DTC Code DTC Name
B2653 Lifter Sensor Malfunction

DESCRIPTION

When the front power seat switch does not receive a sensor signal despite upward or downward movement of the seat by power seat motor operation, this DTC is stored.

DTC Code DTC Detection Condition Trouble Area
B2653 The upward and downward lock detection position of the sensor is the same.

  • Front power seat switch

  • Separate type front seat cushion spring assembly (Lifter motor)

  • Harness or connector

WIRING DIAGRAM

B001FGIE04

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (POWER SEAT MOTOR FUNCTION)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check the power seat motor function Click here.

      Tester Display Test Part Control Range Diagnostic Note
      Lifter Operation Seat lifter operation Up / OFF / Down -
      OK
      Motor operates normally.

    NG

    INSPECT SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (LIFTER MOTOR) Click here

    OK

  2. CHECK FRONT POWER SEAT SWITCH (LIFTER MOTOR CIRCUIT)


    1. B001G6YE01
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to Separate Type Front Seat Cushion Spring Assembly [Lifter Motor])

      Disconnect the b3*1 or a3*2 motor 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 Switch Condition Specified Condition
      b3-2 (O/P) - b3-3 (GND) Lifter switch on 4.8 to 5.1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      a3-2 (O/P) - a3-3 (GND) Lifter switch on 4.8 to 5.1 V

    NG

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - LIFTER MOTOR) Click here

    OK

  3. CHECK SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (LIFTER MOTOR)


    1. B001FXCE01
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

      (Separate Type Front Seat Cushion Spring Assembly [Lifter Motor])

      Connect the b3*1 or a3*2 motor 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 Switch Condition Specified Condition
      b3-2 (O/P) - Body ground Lifter switch on 4.5 to 4.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      a3-2 (O/P) - Body ground Lifter switch on 4.5 to 4.8 V

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

    NG

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (LIFTER MOTOR) Click here

  4. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - LIFTER MOTOR)


    • *1: for LHD

    • *2: for RHD


    1. Disconnect the b5*1 or a5*2 switch connector.

    2. Disconnect the b3*1 or a3*2 motor connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b5-4 (SSRL) - b3-2 (O/P) Always Below 1 Ω
      b5-1 (SGND) - b3-3 (GND) Always Below 1 Ω
      b5-4 (SSRL) - Body ground Always 10 kΩ or higher
      b5-1 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a5-4 (SSRL) - a3-2 (O/P) Always Below 1 Ω
      a5-1 (SGND) - a3-3 (GND) Always Below 1 Ω
      a5-4 (SSRL) - Body ground Always 10 kΩ or higher
      a5-1 (SGND) - Body ground Always 10 kΩ or higher

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (LIFTER MOTOR)


    1. B001HXWE03
      *1 DOWN
      *2 UP

      Remove the separate type front seat cushion spring assembly (lifter motor) Click here.

    2. Check if the seat cushion spring moves smoothly when the battery is connected to the lifter motor connector terminals.

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 1 (UP)

      Battery negative (-) → 4 (DOWN)

      		 Seat cushion spring moves upward

      Battery positive (+) → 4 (DOWN)

      Battery negative (-) → 1 (UP)

      		 Seat cushion spring moves downward

    NG

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (LIFTER MOTOR) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - LIFTER MOTOR)


    • *1: for LHD

    • *2: for RHD


    1. Disconnect the b4*1 or a4*2 switch connector.

    2. Disconnect the b3*1 or a3*2 motor connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b4-10 (LFT+) - b3-1 (UP) Always Below 1 Ω
      b4-12 (LFT-) - b3-4 (DOWN) Always Below 1 Ω
      b4-10 (LFT+) - Body ground Always 10 kΩ or higher
      b4-12 (LFT-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a4-10 (LFT+) - a3-1 (UP) Always Below 1 Ω
      a4-12 (LFT-) - a3-4 (DOWN) Always Below 1 Ω
      a4-10 (LFT+) - Body ground Always 10 kΩ or higher
      a4-12 (LFT-) - Body ground Always 10 kΩ or higher

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR