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

B342142E09

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. E118523C53

      *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. B238515C37

      *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