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

DTC Code DTC Name
B2653 Lifter Sensor Malfunction

DESCRIPTION

When the position control ECU assembly (driver seat) does not receive a lifter motor position sensor signal despite the seat having been moved upward or downward by power seat motor operation, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2653 Lifter Sensor Malfunction Lifter motor position sensor signal not received when power seat moved upward or downward

  • Position control ECU assembly (driver seat)

  • Power seat lifter motor assembly (driver seat)

  • Wire harness or connector

WIRING DIAGRAM

B006ZJUE02
*a SENG
*b Power Seat Lifter Motor Assembly (Driver Seat)
*c Position Control ECU Assembly (Driver Seat)
*d Front Seat Adjuster Assembly (Driver Seat)

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2653 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. PERFORM ACTIVE TEST USING GTS (SEAT LIFTER OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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
      Lifter motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT) Click here

    OK

  4. CHECK POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) (LIFTER MOTOR CIRCUIT)


    1. Disconnect the a7 power seat lifter motor assembly (driver seat) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      a7-2 - a7-3 Lifter switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) - POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT)) Click here

    OK

  5. CHECK POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT)


    1. B0088NGC52
      *a

      Component with harness connected

      (Power Seat Lifter Motor Assembly (Driver Seat))

      Reconnect the a7 power seat lifter motor assembly (driver seat) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      a7-2 - Body ground Lifter motor operating 4.5 to 4.8 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPLACE POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT) Click here

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) - POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT))


    1. Disconnect the a12 position control ECU assembly (driver seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a12-25 (SSRL) - a7-2 Always Below 1 Ω
      a12-25 (SSRL) or a7-2 - Body ground Always 10 kΩ or higher
      a12-12 (SENG) - a7-3 Always Below 1 Ω
      a12-12 (SENG) or a7-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT)


    1. Remove the power seat lifter motor assembly (driver seat).

      Click here

    2. Inspect the power seat lifter motor assembly (driver seat).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT) Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) - POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT))


    1. Disconnect the a10 and a11 position control ECU assembly (driver seat) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a10-6 (LFT+) - a7-1 Always Below 1 Ω
      a10-6 (LFT+) or a7-1 - Body ground Always 10 kΩ or higher
      a11-5 (LFT-) - a7-4 Always Below 1 Ω
      a11-5 (LFT-) or a7-4 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR