FRONT POWER SEAT CONTROL SYSTEM (for RHD), Diagnostic DTC:B2655

DTC Code DTC Name
B2655 Cushion Length Sensor Malfunction

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
B2655 The forward and backward lock detection position of the sensor is the same.

  • Position control ECU assembly

  • Front seat adjuster assembly RH (Cushion motor)*1

  • Front seat adjuster assembly LH (Cushion motor)*2

  • Harness or connector

WIRING DIAGRAM


  1. for Driver Side (Sports Seat Type, Luxury Seat Type):

    A01FDO0E35

  2. for Front Passenger Side (Luxury Seat Type):

    A01FDO0E36

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Check the parts which the DTCs have been output from Click here.

      Result
      Result Proceed to
      DTC output from "Driver Seat" A
      DTC output from "Passenger Seat" B

    B

    PERFORM ACTIVE TEST USING GTS (CUSHION LENGTH) Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (CUSHION LENGTH)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

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

      Driver Seat
      Tester Display Test Part Control Range Diagnostic Note
      Cushion Length Cushion Length operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY RH (CUSHION MOTOR) Click here

    OK

  3. CHECK POSITION CONTROL ECU ASSEMBLY (CUSHION MOTOR CIRCUIT)


    1. A01FDXZE64
      Text in Illustration
      *a

      Front view of harness connector

      (to Front Seat Adjuster Assembly RH [Cushion Motor])

      Disconnect the cushion motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c9-2 (VCC) - c9-3 (GND) Cushion switch on 4.8 to 5.1 V

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY RH) Click here

    OK

  4. CHECK FRONT SEAT ADJUSTER ASSEMBLY RH (CUSHION MOTOR)


    1. A01FFM9E86
      Text in Illustration
      *a

      Component with harness connected

      (Front Seat Adjuster Assembly RH [Cushion Motor])

      Reconnect the cushion motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c9-2 (VCC) - Body ground Cushion switch on 4.5 to 4.8 V
      Result
      Result Proceed to
      OK (for Sports Seat Type) A
      OK (for Luxury Seat Type) B
      NG (for Sports Seat Type) C
      NG (for Luxury Seat Type) D

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    C

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH (CUSHION MOTOR) Click here

    D

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH (CUSHION MOTOR) Click here

    A

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY RH)


    1. Disconnect the c2 and c3 position control ECU assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c3-3 (SSRC) - c9-2 (VCC) Always Below 1 Ω
      c2-20 (SGND) - c9-3 (GND) Always Below 1 Ω
      c3-3 (SSRC) - Body ground Always 10 kΩ or higher
      c2-20 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for Sports Seat Type) A
      OK (for Luxury Seat Type) B
      NG C

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  6. INSPECT FRONT SEAT ADJUSTER ASSEMBLY RH (CUSHION MOTOR)


    1. A01FFTWE19
      Text in Illustration
      *a

      Component without harness connected

      (Front Seat Adjuster Assembly RH [Cushion Motor])

      Disconnect the c9 cushion motor connector.

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

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 1 (FWD)

      Battery negative (-) → 4 (BACK)

      		 Forward

      Battery positive (+) → 4 (BACK)

      Battery negative (-) → 1 (FWD)

      		 Backward
      Result
      Result Proceed to
      OK A
      NG (for Sports Seat Type) B
      NG (for Luxury Seat Type) C

    B

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH (CUSHION MOTOR) Click here

    C

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH (CUSHION MOTOR) Click here

    A

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY RH)


    1. Disconnect the c2 and c3 position control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c3-6 (C+) - c9-1 (FWD) Always Below 1 Ω
      c2-4 (C-) - c9-4 (BACK) Always Below 1 Ω
      c3-6 (C+) - Body ground Always 10 kΩ or higher
      c2-4 (C-) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for Sports Seat Type) A
      OK (for Luxury Seat Type) B
      NG C

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  8. PERFORM ACTIVE TEST USING GTS (CUSHION LENGTH)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

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

      Passenger Seat
      Tester Display Test Part Control Range Diagnostic Note
      Cushion Length Cushion length operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY LH (CUSHION MOTOR) Click here

    OK

  9. CHECK POSITION CONTROL ECU ASSEMBLY (CUSHION MOTOR CIRCUIT)


    1. A01FDXZE65
      Text in Illustration
      *a

      Front view of harness connector

      (to Front Seat Adjuster Assembly LH [Cushion Motor])

      Disconnect the cushion motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d9-2 (P) - d9-3 (GND) Cushion switch on 4.8 to 5.1 V

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY LH) Click here

    OK

  10. CHECK FRONT SEAT ADJUSTER ASSEMBLY LH (CUSHION MOTOR)


    1. A01FFM9E87
      Text in Illustration
      *a

      Component with harness connected

      (Front Seat Adjuster Assembly LH [Cushion Motor])

      Reconnect the cushion motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d9-2 (P) - Body ground Cushion switch on 4.5 to 4.8 V

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH (CUSHION MOTOR) Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  11. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY LH)


    1. Disconnect the d4 and d5 position control ECU assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d4-3 (SSRC) - d9-2 (P) Always Below 1 Ω
      d5-20 (SGND) - d9-3 (GND) Always Below 1 Ω
      d4-3 (SSRC) - Body ground Always 10 kΩ or higher
      d5-20 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  12. INSPECT FRONT SEAT ADJUSTER ASSEMBLY LH (CUSHION MOTOR)


    1. A01FFTWE20
      Text in Illustration
      *a

      Component without harness connected

      (Front Seat Adjuster Assembly LH [Cushion Motor])

      Disconnect the d9 cushion motor connector.

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

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 1 (SI)

      Battery negative (-) → 4 (SO)

      		 Forward

      Battery positive (+) → 4 (SO)

      Battery negative (-) → 1 (SI)

      		 Backward

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH (CUSHION MOTOR) Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY LH)


    1. Disconnect the d4 and d5 position control ECU assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d4-6 (C+) - d9-1 (SI) Always Below 1 Ω
      d5-4 (C-) - d9-4 (SO) Always Below 1 Ω
      d4-6 (C+) - Body ground Always 10 kΩ or higher
      d5-4 (C-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here