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FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2651

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DTC Code DTC Name
B2651 Reclining Sensor Malfunction
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DESCRIPTION

When the position control ECU assembly does not receive a sensor signal despite forward or rearward movement of the seat by power seat motor operation, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2651 Reclining Sensor Malfunction The forward and rearward lock detection position of the sensor is the same.

  • Position control ECU assembly

  • No. 2 position control ECU assembly

  • Front seatback frame sub-assembly LH (reclining motor)

  • Front seatback frame sub-assembly RH (reclining motor)

  • Harness or connector
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WIRING DIAGRAM


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  1. Figure 2. for RHD: B004TBVE12
    Table 2.
    *a Reclining Motor
    *b Position Control ECU Assembly
    *c Front Seatback Frame Sub-assembly RH
    Figure 1. for LHD: B004TBVE11
    Table 1.
    *a Reclining Motor
    *b No. 2 Position Control ECU Assembly
    *c Front Seatback Frame Sub-assembly LH

    for Driver Seat:

  2. Figure 4. for RHD: B004TBVE11
    Table 4.
    *a Reclining Motor
    *b No. 2 Position Control ECU Assembly
    *c Front Seatback Frame Sub-assembly LH
    Figure 3. for LHD: B004TBVE13
    Table 3.
    *a Reclining Motor
    *b No. 2 Position Control ECU Assembly
    *c Front Seatback Frame Sub-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 B2651 is not output.
      Result
      Result Proceed to
      DTC B2651 is not output A
      DTC B2651 output from "Driver Seat" B
      DTC B2651 output from "Front Passenger Seat" C

  3. Click here

    PERFORM ACTIVE TEST USING GTS (SEAT RECLINING)


    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
        Seat Reclining Seat reclining operation OFF/Rear/Front -



      1. Body Electrical > Driver Seat > Active Test
        Tester Display
        Seat Reclining




      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK POSITION CONTROL ECU ASSEMBLY (RECLINING MOTOR CIRCUIT)


    1. for LHD:


      1. Disconnect the front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        S15-2 - S15-3 Reclining switch on 4.8 to 5.1 V

    2. for RHD:


      1. Disconnect the front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        S1-2 - S1-3 Reclining 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 SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR))


    1. for LHD:


      1. Disconnect the Q28 position control ECU assembly connector.

      2. Disconnect the S15 front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q28-24 (SSRR) - S15-2 Always Below 1 Ω
        Q28-24 (SSRR) or S15-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - S15-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the Q8 position control ECU assembly connector.

      2. Disconnect the S1 front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q8-24 (SSRR) - S1-2 Always Below 1 Ω
        Q8-24 (SSRR) or S1-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - S1-3 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 SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR)


    1. Remove the front seatback frame sub-assembly.

      Click here

    2. Inspect the front seatback frame sub-assembly (reclining motor).

      Click here

      Result
      Proceed to
      OK
      NG

  7. Click here

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR))


    1. for LHD:


      1. Disconnect the Q26 position control ECU assembly connector.

      2. Disconnect the S15 front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q26-8 (RCL+) - S15-1 Always Below 1 Ω
        Q26-8 (RCL+) or S15-1 - Other terminals and body ground Always 10 kΩ or higher
        Q26-5 (RCL-) - S15-4 Always Below 1 Ω
        Q26-5 (RCL-) or S15-4 - 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 S1 front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q6-8 (RCL+) - S1-1 Always Below 1 Ω
        Q6-8 (RCL+) or S1-1 - Other terminals and body ground Always 10 kΩ or higher
        Q6-5 (RCL-) - S1-4 Always Below 1 Ω
        Q6-5 (RCL-) or S1-4 - 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 (SEAT RECLINING)


    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
        Seat Reclining Seat reclining operation OFF/Rear/Front -



      1. Body Electrical > Passenger Seat > Active Test
        Tester Display
        Seat Reclining




      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

  9. Click here

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


    1. for LHD:


      1. Disconnect the front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        S1-2 - S1-3 Reclining switch on 4.8 to 5.1 V

    2. for RHD:


      1. Disconnect the front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        S15-2 - S15-3 Reclining 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 SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR))


    1. for LHD:


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

      2. Disconnect the S1 front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q8-24 (SSRR) - S1-2 Always Below 1 Ω
        Q8-24 (SSRR) or S1-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - S1-3 Always Below 1 Ω

    2. for RHD:


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

      2. Disconnect the S15 front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q28-24 (SSRR) - S15-2 Always Below 1 Ω
        Q28-24 (SSRR) or S15-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - S15-3 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 SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR)


    1. Remove the front seatback frame sub-assembly.

      Click here

    2. Inspect the front seatback frame sub-assembly (reclining motor).

      Click here

      Result
      Proceed to
      OK
      NG

  12. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR))


    1. for LHD:


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

      2. Disconnect the S1 front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q6-8 (RCL+) - S1-1 Always Below 1 Ω
        Q6-8 (RCL+) or S1-1 - Other terminals and body ground Always 10 kΩ or higher
        Q6-5 (RCL-) - S1-4 Always Below 1 Ω
        Q6-5 (RCL-) or S1-4 - Other terminals and body ground Always 10 kΩ or higher

    2. for RHD:


      1. Disconnect the Q26 position control ECU assembly connector.

      2. Disconnect the S15 front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q26-8 (RCL+) - S15-1 Always Below 1 Ω
        Q26-8 (RCL+) or S15-1 - Other terminals and body ground Always 10 kΩ or higher
        Q26-5 (RCL-) - S15-4 Always Below 1 Ω
        Q26-5 (RCL-) or S15-4 - 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