FRONT POWER SEAT CONTROL SYSTEM (for LHD), Diagnostic DTC:B265C

DTC Code DTC Name
B265C Pelvis Support Sensor Circuit

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
B265C The forward and backward lock detection position of the sensor is the same.

  • Position control ECU assembly

  • Lumbar support adjuster assembly LH (Pelvis motor)*1

  • Lumbar support adjuster assembly RH (Pelvis motor)*2

  • Harness or connector

WIRING DIAGRAM


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

    A01FQI6E24

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

    A01FQI6E25

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 (PELVIS SUPPORT OPERATION) Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (PELVIS SUPPORT OPERATION)


    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 / 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
      Pelvis Support Operation Pelvis support operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (PELVIS MOTOR) Click here

    OK

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


    1. A01FSRQE48
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Lumbar Support Adjuster Assembly LH [Pelvis Motor])

      Disconnect the pelvis motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d28-2 (SPEL) - d28-3 (PELE) Pelvis switch on 4.8 to 5.1 V

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT ADJUSTER ASSEMBLY LH) Click here

    OK

  4. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (PELVIS MOTOR)


    1. A01FR07E75
      Text in Illustration
      *a

      Component with harness connected

      (Lumbar Support Adjuster Assembly LH [Pelvis Motor])

      Reconnect the pelvis motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d28-2 (SPEL) - Body ground Pelvis 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 LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (PELVIS MOTOR) Click here

    D

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (PELVIS MOTOR) Click here

    A

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT 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
      d4-15 (SSPL) - d28-2 (SPEL) Always Below 1 Ω
      d5-20 (SGND) - d28-3 (PELE) Always Below 1 Ω
      d4-15 (SSPL) - Body ground Always 10 kΩ or higher
      d5-20 (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 LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (PELVIS MOTOR)


    1. A01FVQQE29
      Text in Illustration
      *a

      Component without harness connected

      (Lumbar Support Adjuster Assembly LH [Pelvis Motor])

      Disconnect the d28 pelvis motor connector.

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

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 1 (PEL+)

      Battery negative (-) → 4 (PEL-)

      		 Forward

      Battery positive (+) → 4 (PEL-)

      Battery negative (-) → 1 (PEL+)

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

    B

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (PELVIS MOTOR) Click here

    C

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (PELVIS MOTOR) Click here

    A

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT ADJUSTER ASSEMBLY LH)


    1. Disconnect the d3 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
      d3-4 (PEL+) - d28-1 (PEL+) Always Below 1 Ω
      d3-2 (PEL-) - d28-4 (PEL-) Always Below 1 Ω
      d3-4 (PEL+) - Body ground Always 10 kΩ or higher
      d3-2 (PEL-) - 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 (PELVIS SUPPORT OPERATION)


    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
      Pelvis Support Operation Pelvis support operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

    INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (PELVIS MOTOR) Click here

    OK

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


    1. A01FSRQE49
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Lumbar Support Adjuster Assembly RH [Pelvis Motor])

      Disconnect the pelvis motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c33-2 (SPEL) - c33-3 (PELG) Pelvis switch on 4.8 to 5.1 V

    NG

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT ADJUSTER ASSEMBLY RH) Click here

    OK

  10. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (PELVIS MOTOR)


    1. A01FR07E76
      Text in Illustration
      *a

      Component with harness connected

      (Lumbar Support Adjuster Assembly RH [Pelvis Motor])

      Reconnect the pelvis motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c33-2 (SPEL) - Body ground Pelvis switch on 4.5 to 4.8 V

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (PELVIS MOTOR) Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  11. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT 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
      c3-15 (SSPL) - c33-2 (SPEL) Always Below 1 Ω
      c2-20 (SGND) - c33-3 (PELG) Always Below 1 Ω
      c3-15 (SSPL) - 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

  12. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (PELVIS MOTOR)


    1. A01FVQQE29
      Text in Illustration
      *a

      Component without harness connected

      (Lumbar Support Adjuster Assembly RH [Pelvis Motor])

      Disconnect the c33 pelvis motor connector.

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

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 1 (PEL+)

      Battery negative (-) → 4 (PEL-)

      		 Forward

      Battery positive (+) → 4 (PEL-)

      Battery negative (-) → 1 (PEL+)

      		 Backward

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (PELVIS MOTOR) Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT ADJUSTER ASSEMBLY RH)


    1. Disconnect the c4 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
      c4-4 (PEL+) - c33-1 (PEL+) Always Below 1 Ω
      c4-2 (PEL-) - c33-4 (PEL-) Always Below 1 Ω
      c4-4 (PEL+) - Body ground Always 10 kΩ or higher
      c4-2 (PEL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here