FRONT POWER SEAT CONTROL SYSTEM (for LHD), 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 RH (Ottoman motor)

  • Harness or connector

WIRING DIAGRAM

A01FQI6E53

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (OTTOMAN)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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 RH (OTTOMAN MOTOR) Click here

    OK

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


    1. A01FSRQE95
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Front Seat Adjuster Assembly RH [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
      c35-2 (P) - c35-3 (GND) Ottoman 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

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


    1. A01FR07E90
      Text in Illustration
      *a

      Component with harness connected

      (Front Seat Adjuster Assembly RH [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
      c35-2 (P) - Body ground Ottoman switch on 4.5 to 4.8 V

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH (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 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) - c35-2 (P) Always Below 1 Ω
      c2-20 (SGND) - c35-3 (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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

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


    1. A01FVQQE18
      Text in Illustration
      *a

      Component without harness connected

      (Front Seat Adjuster Assembly RH [Ottoman Motor])

      Disconnect the c35 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 RH (OTTOMAN MOTOR) Click here

    OK

  6. 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
      c3-6 (C+) - c35-1 (SI) Always Below 1 Ω
      c2-4 (C-) - c35-4 (SO) Always Below 1 Ω
      c3-6 (C+) - Body ground Always 10 kΩ or higher
      c2-4 (C-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here