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FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2653

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DTC Code DTC Name
B2653 Lifter Sensor Malfunction
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DESCRIPTION

When the position control ECU assembly does not receive a sensor signal despite upward or downward movement of the seat cushion 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 assembly

  • No. 2 position control ECU assembly

  • Front seat adjuster assembly LH (rear lifter motor)

  • Front seat adjuster assembly RH (rear lifter motor)

  • Harness or connector
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WIRING DIAGRAM


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  1. Figure 2. for RHD: B004TBVE19
    Table 2.
    *a Rear Lifter Motor
    *b Position Control ECU Assembly
    *c Front Seat Adjuster Assembly RH
    Figure 1. for LHD: B004TBVE18
    Table 1.
    *a Rear Lifter Motor
    *b Position Control ECU Assembly
    *c Front Seat Adjuster Assembly LH

    for Driver Seat:

  2. Figure 4. for RHD: B004TBVE21
    Table 4.
    *a Rear Lifter Motor
    *b No. 2 Position Control ECU Assembly
    *c Front Seat Adjuster Assembly LH
    Figure 3. for LHD: B004TBVE20
    Table 3.
    *a Rear Lifter Motor
    *b No. 2 Position Control ECU Assembly
    *c Front Seat Adjuster Assembly RH

    for Front Passenger Seat

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CAUTION / NOTICE / HINT

Note:

Initializing the position control ECU assembly will clear the seat position memory.

Tip:

  • Make sure to initialize the position control ECU assembly after replacing the seat assembly or any related parts (including removal and installation).

  • Before initializing the seat ECU, make sure that the D/C CUT fuse is normal.

  • When any of the following conditions are met, the seat position Information in the position control ECU assembly will be cleared.


    • The power switch is turned off with any of the seat switches being operated and the D/C CUT fuse removed.

    • The power switch is turned off within 1 second of any of the seat switches being operated with the D/C CUT fuse removed.

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PROCEDURE


  1. Click here

    CLEAR DTC


    1. Clear the DTCs.

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      1. Body Electrical > Driver Seat > Clear DTCs



      1. Body Electrical > Passenger Seat > Clear DTCs


      Result
      Proceed to
      NEXT

  2. Click here

    CHECK FOR DTC


    1. Check for DTCs.

      Click here


      1. Body Electrical > Driver Seat > Trouble Codes



      1. Body Electrical > Passenger Seat > Trouble Codes


      OK
      DTC B2653 is not output.
      Result
      Result Proceed to
      DTC B2653 is not output A
      DTC B2653 output from "Driver Seat" B
      DTC B2653 output from "Front Passenger Seat" C

  3. Click here

    PERFORM ACTIVE TEST USING GTS (LIFTER OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the power 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.


      1. Body Electrical > Driver Seat > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Lifter Operation Seat lifter operation OFF/Up/Down -



      1. Body Electrical > Driver Seat > Active Test
        Tester Display
        Lifter Operation




      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK POSITION CONTROL ECU ASSEMBLY (LIFTER MOTOR CIRCUIT)


    1. for LHD


      1. Disconnect the front seat adjuster assemblny LH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q22-2 - Q22-3 Lifter switch on 4.8 to 5.1 V

    2. for RHD


      1. Disconnect the front seat adjuster assemblny RH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q3-2 - Q3-3 Lifter switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

  5. Click here

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (REAR LIFTER MOTOR))


    1. for LHD


      1. Disconnect the Q28 position control ECU assembly connector.

      2. Disconnect the Q22 front seat adjuster assembly LH (rear lifter motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q28-15 (SSRL) - Q22-2 Always Below 1 Ω
        Q28-15 (SSRL) or Q22-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q22-3 Always Below 1 Ω

    2. for RHD


      1. Disconnect the Q8 position control ECU assembly connector.

      2. Disconnect the Q3 front seat adjuster assembly LH (rear lifter motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q8-15 (SSRL) - Q3-2 Always Below 1 Ω
        Q8-15 (SSRL) or Q3-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q3-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE POSITION CONTROL ECU ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY (REAR LIFTER MOTOR)


    1. Remove the front seat adjuster assembly (rear lifter motor).

      Click here

    2. Inspect the front seat adjuster assembly (rear lifter motor).

      Click here

      Result
      Proceed to
      OK
      NG

  7. Click here

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (REAR LIFTER MOTOR))


    1. for LHD:


      1. Disconnect the Q26 position control ECU assembly connector.

      2. Disconnect the Q22 front seat adjuster assembly LH (rear lifter motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q26-9 (LFT+) - Q22-1 Always Below 1 Ω
        Q26-9 (LFT+) or Q22-1 - Other terminals and body ground Always 10 kΩ or higher
        Q26-2 (LFT-) - Q22-4 Always Below 1 Ω
        Q26-2 (LFT-) or Q22-4 - Other terminals and body ground Always 10 kΩ or higher

    2. for RHD:


      1. Disconnect the Q6 position control ECU assembly connector.

      2. Disconnect the Q3 front seat adjuster assembly RH (rear lifter motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q6-9 (LFT+) - Q3-1 Always Below 1 Ω
        Q6-9 (LFT+) or Q3-1 - Other terminals and body ground Always 10 kΩ or higher
        Q6-2 (LFT-) - Q3-4 Always Below 1 Ω
        Q6-2 (LFT-) or Q3-4 - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE POSITION CONTROL ECU ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    PERFORM ACTIVE TEST USING GTS (LIFTER OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Passenger Seat / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      1. Body Electrical > Passenger Seat > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Lifter Operation Seat lifter operation OFF/Up/Down -



      1. Body Electrical > Passenger Seat > Active Test
        Tester Display
        Lifter Operation




      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

  9. Click here

    CHECK NO. 2 POSITION CONTROL ECU ASSEMBLY (LIFTER MOTOR CIRCUIT)


    1. for LHD:


      1. Disconnect the front seat adjuster assembly RH (rear lifter motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q3-2 - Q3-3 Lifter switch on 4.8 to 5.1 V

    2. for RHD:


      1. Disconnect the front seat adjuster assembly LH (rear lifter motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q22-2 - Q22-3 Lifter switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

  10. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (REAR LIFTER MOTOR))


    1. for LHD:


      1. Disconnect the Q8 No. 2 position control ECU assembly connector.

      2. Disconnect the Q3 front seat adjuster assembly RH (rear lifter motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q8-15 (SSRL) - Q3-2 Always Below 1 Ω
        Q8-15 (SSRL) or Q3-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q3-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the Q28 No. 2 position control ECU assembly onnector.

      2. Disconnect the Q22 front seat adjuster assembly LH (rear lifter motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q28-15 (SSRL) - Q22-2 Always Below 1 Ω
        Q28-15 (SSRL) or Q22-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q22-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. Click here

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY (REAR LIFTER MOTOR)


    1. Remove the front seat adjuster assembly (rear lifter motor).

      Click here

    2. Inspect the front seat adjuster assembly (rear lifter motor).

      Click here

      Result
      Proceed to
      OK
      NG

  12. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (CUSHION MOTOR))


    1. for LHD:


      1. Disconnect the Q6 No. 2 position control ECU assembly connector.

      2. Disconnect the Q3 front seat adjuster assembly RH (rear lifter motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q6-9 (LFT+) - Q3-1 Always Below 1 Ω
        Q6-9 (LFT+) or Q3-1 - Other terminals and body ground Always 10 kΩ or higher
        Q6-2 (LFT-) - Q3-4 Always Below 1 Ω
        Q6-2 (LFT-) or Q3-4 - Other terminals and body ground Always 10 kΩ or higher

    2. for RHD:


      1. Disconnect the Q26 No. 2 position control ECU assembly connector.

      2. Disconnect the Q22 front seat adjuster assembly LH (rear lifter motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q26-9 (LFT+) - Q22-1 Always Below 1 Ω
        Q26-9 (LFT+) or Q22-1 - Other terminals and body ground Always 10 kΩ or higher
        Q26-2 (LFT-) - Q22-4 Always Below 1 Ω
        Q26-2 (LFT-) or Q22-4 - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR