FRONT POWER SEAT CONTROL SYSTEM (w/ Memory), Diagnostic DTC:B2651

DTC Code DTC Name
B2651 Reclining Sensor Malfunction

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
B2651 The forward and backward lock detection position of the sensor is the same.

  • Position control ECU and switch assembly

  • Reclining motor (Separate type front seat back spring assembly)

  • Wire harness or connector

WIRING DIAGRAM


  1. for LHD

    A003YJGE07

  2. for RHD

    A003YJGE06

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (RECLINING MOTOR)


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Body / Driver Seat / Active Test.

    6. Perform the Active Test according to the display on the intelligent tester.

      Driver Seat (Position Control ECU and Switch Assembly)
      Tester Display Test Part Control Ranger Diagnostic Note
      Seat Reclining Seat reclining operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    INSPECT RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY) Click here

    OK

  2. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (RECLINING MOTOR CIRCUIT)


    1. Disconnect the Z1*1 or Y1*2 reclining motor connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      Z1-2 - Z1-3 Reclining switch on 4.8 to 5.1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      Y1-2 - Y1-3 Reclining switch on 4.8 to 5.1 V

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - RECLINING MOTOR) Click here

    OK

  3. CHECK RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY)


    1. A003YSSE24
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

      (Reclining Motor (Separate Type Front Seat Back Spring Assembly))

      Reconnect the Z1*1 or Y1*2 reclining motor connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      Z1-2 - Body ground Reclining switch on 4.5 to 4.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      Y1-2 - Body ground Reclining switch on 4.5 to 4.8 V

    NG

    REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY) Click here

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - RECLINING MOTOR)


    1. Disconnect the X5*1 or W4*2 position control ECU and switch assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      X5-11 (SSRR) - Z1-2 Always Below 1 Ω
      X5-1 (SGND) - Z1-3 Always Below 1 Ω
      X5-11 (SSRR) - Body ground Always 10 kΩ or higher
      X5-1 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      W4-11 (SSRR) - Y1-2 Always Below 1 Ω
      W4-1 (SGND) - Y1-3 Always Below 1 Ω
      W4-11 (SSRR) - Body ground Always 10 kΩ or higher
      W4-1 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

  5. INSPECT RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY)


    1. A003VX4E14
      Text in Illustration
      *a

      Component without harness connected

      (Reclining Motor (Separate Type Front Seat Back Spring Assembly))

      Disconnect the Z1*1 or Y1*2 reclining motor connector.


      • *1: for LHD

      • *2: for RHD

    2. Check if the seat back moves smoothly when the auxiliary battery is connected to the reclining motor connector terminals.

      OK
      Measurement Condition Operational Direction

      Auxiliary battery positive (+) → 4

      Auxiliary battery negative (-) → 1

      		 Seat back moves forward

      Auxiliary battery positive (+) → 1

      Auxiliary battery negative (-) → 4

      		 Seat back moves backward

    NG

    REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - RECLINING MOTOR)


    1. Disconnect the X4*1 or W3*2 position control ECU and switch assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      X4-9 (RCL+) - Z1-4 Always Below 1 Ω
      X4-11 (RCL-) - Z1-1 Always Below 1 Ω
      X4-9 (RCL+) - Body ground Always 10 kΩ or higher
      X4-11 (RCL-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      W3-9 (RCL+) - Y1-4 Always Below 1 Ω
      W3-11 (RCL-) - Y1-1 Always Below 1 Ω
      W3-9 (RCL+) - Body ground Always 10 kΩ or higher
      W3-11 (RCL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here