FRONT POWER SEAT CONTROL SYSTEM (for RHD), Diagnostic DTC:B2657

DTC Code DTC Name
B2657 Ottoman 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
B2657 The forward and backward lock detection position of the sensor is the same.

  • Position control ECU assembly

  • Front seat adjuster assembly LH (Ottoman motor)

  • Harness or connector

WIRING DIAGRAM

A01FDO0E52

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (OTTOMAN)


    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
      Ottoman Seat ottoman operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

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

    OK

  2. CHECK POSITION CONTROL ECU ASSEMBLY (OTTOMAN MOTOR CIRCUIT)


    1. A01FDXZE68
      Text in Illustration
      *a

      Front view of harness connector

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

      Disconnect the ottoman 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) Ottoman 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

  3. CHECK FRONT SEAT ADJUSTER ASSEMBLY LH (OTTOMAN MOTOR)


    1. A01FFM9E89
      Text in Illustration
      *a

      Component with harness connected

      (Front Seat Adjuster Assembly LH [Ottoman Motor])

      Reconnect the ottoman 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 Ottoman switch on 4.5 to 4.8 V

    NG

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

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  4. 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

  5. INSPECT FRONT SEAT ADJUSTER ASSEMBLY LH (OTTOMAN MOTOR)


    1. A01FFTWE18
      Text in Illustration
      *a

      Component without harness connected

      (Front Seat Adjuster Assembly LH [Ottoman Motor])

      Disconnect the d9 ottoman motor connector.

    2. Check if the ottoman motor moves smoothly when the battery is connected to the ottoman 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 (OTTOMAN MOTOR) Click here

    OK

  6. 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