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 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

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

  • Harness or connector

WIRING DIAGRAM

A00YXJME09

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (LIFTER MOTOR)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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/Down/Up -

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

    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. A00YV0RC53
      *a

      Front view of wire harness connector

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

      Disconnect the e14 lifter motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      e14-2 - e14-3 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 - LIFTER MOTOR) Click here

    OK

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


    1. A00YXTLC37
      *a

      Component with harness connected

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

      Reconnect the e14 lifter motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      e14-2 - Body ground Lifter switch on 4.5 to 4.8 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

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

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


    1. Disconnect the e6 position control ECU and switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e6-4 (SSRL) - e14-2 Always Below 1 Ω
      e6-1 (SGND) - e14-3 Always Below 1 Ω
      e6-4 (SSRL) - Body ground Always 10 kΩ or higher
      e6-1 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Remove the separate type front seat cushion spring assembly.

      Click here

    2. Inspect the separate type front seat cushion spring assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    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 e18 position control ECU and switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e18-10 (LFT+) - e14-4 Always Below 1 Ω
      e18-12 (LFT-) - e14-1 Always Below 1 Ω
      e18-10 (LFT+) - Body ground Always 10 kΩ or higher
      e18-12 (LFT-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR