FRONT POWER SEAT CONTROL SYSTEM, 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 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.

  • Front power seat switch LH

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

  • Harness or connector

WIRING DIAGRAM

B248458E04

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

      Body Electrical > Driver Seat > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Lifter Operation

      Seat lifter operation

      Up / OFF / Down

      -

      OK

      Motor operates normally.

    Result

    Result

    OK

    NG

    NG

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

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

    B238255C04

    *a

    Front view of wire harness connector

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

    1. Disconnect the b3 motor connector.

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

    Standard Voltage

    Tester Connection

    Switch Condition

    Specified Condition

    b3-2 (O/P) - b3-3 (GND)

    Lifter switch on

    4.8 to 5.1 V

    Result

    Result

    OK

    NG

    NG

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

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

    B238515C04

    *a

    Component with harness connected

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

    1. Connect the b3 motor connector.

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

    Standard Voltage

    Tester Connection

    Switch Condition

    Specified Condition

    b3-2 (O/P) - Body ground

    Lifter switch on

    4.5 to 4.8 V

    Result

    Result

    OK

    NG

    OK

    REPLACE FRONT POWER SEAT SWITCH LH

    NG

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

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

    1. Disconnect the b5 switch connector.

    2. Disconnect the b3 motor connector.

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

      Standard Resistance

      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

    Result

    Result

    OK

    NG

    OK

    REPLACE FRONT POWER SEAT SWITCH LH

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    B238256E17
    1. Remove the separate type front seat cushion spring assembly LH (lifter motor)

      Click hereClick hereClick here

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

      OK

      Measurement Condition

      Specified Condition

      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

    Result

    Result

    OK

    NG

    NG

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

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

    1. Disconnect the b4 switch connector.

    2. Disconnect the b3 motor connector.

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

      Standard Resistance

      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

    Result

    Result

    OK

    NG

    OK

    REPLACE FRONT POWER SEAT SWITCH LH

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR