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

DTC Code DTC Name
B2653 Lifter Sensor Malfunction

DESCRIPTION

When the position control ECU and switch assembly 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.

  • Position control ECU and switch assembly

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

  • Wire harness or connector

WIRING DIAGRAM


  1. for LHD

    A003YJGE04

  2. for RHD

    A003YJGE09

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (LIFTER MOTOR)


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the intelligent tester on.

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

    6. Perform the Active Test according to the display on the intelligent tester.

      Driver Seat (Position Control ECU and Switch Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Lifter Operation Seat lifter operation Up / OFF / Down -
      OK
      Motor operates normally.

    NG

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

    OK

  2. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (LIFTER MOTOR CIRCUIT)


    1. Disconnect the X3*1 or W6*2 lifter 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
      X3-2 - X3-3 Lifter switch on 4.8 to 5.1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      W6-2 - W6-3 Lifter switch on 4.8 to 5.1 V

    NG

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

    OK

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


    1. A003YSSE26
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

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

      Reconnect the X3*1 or W6*2 lifter 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
      X3-2 - Body ground Lifter switch on 4.5 to 4.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      W6-2 - Body ground Lifter switch on 4.5 to 4.8 V

    NG

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

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - LIFTER MOTOR)


    1. Disconnect the X5*1 or W4*2 position control ECU and switch assembly 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
      X5-4 (SSRL) - X3-2 Always Below 1 Ω
      X5-1 (SGND) - X3-3 Always Below 1 Ω
      X5-4 (SSRL) - Body ground Always 10 kΩ or higher
      X5-1 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      W4-4 (SSRL) - W6-2 Always Below 1 Ω
      W4-1 (SGND) - W6-3 Always Below 1 Ω
      W4-4 (SSRL) - Body ground Always 10 kΩ or higher
      W4-1 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

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


    1. A003VX4E14
      Text in Illustration
      *a

      Component without harness connected

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

      Disconnect the X3*1 or W6*2 lifter motor connector.


      • *1: for LHD

      • *2: for RHD

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

      OK
      Measurement Condition Operational Direction

      Auxiliary battery positive (+) → 4

      Auxiliary battery negative (-) → 1

      		 Seat cushion spring moves upward

      Auxiliary battery positive (+) → 1

      Auxiliary battery negative (-) → 4

      		 Seat cushion spring moves downward

    NG

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

    OK

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


    1. Disconnect the X4*1 or W3*2 position control ECU and switch assembly 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
      X4-10 (LFT+) - X3-4 Always Below 1 Ω
      X4-12 (LFT-) - X3-1 Always Below 1 Ω
      X4-10 (LFT+) - Body ground Always 10 kΩ or higher
      X4-12 (LFT-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      W3-10 (LFT+) - W6-4 Always Below 1 Ω
      W3-12 (LFT-) - W6-1 Always Below 1 Ω
      W3-10 (LFT+) - Body ground Always 10 kΩ or higher
      W3-12 (LFT-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here