FRONT POWER SEAT CONTROL SYSTEM (for RHD), Diagnostic DTC:B265B

DTC Code DTC Name
B265B Lumbar 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
B265B The forward and backward lock detection position of the sensor is the same.

  • Position control ECU assembly

  • Lumbar support adjuster assembly RH (Lumbar motor)*1

  • Lumbar support adjuster assembly LH (Lumbar motor)*2

  • Harness or connector

WIRING DIAGRAM


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

    A01FQI6E42

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

    A01FQI6E43

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 (LUMBAR SLIDE) Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (LUMBAR SLIDE)


    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
      Lumbar Slide Lumbar sliding operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

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

    OK

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


    1. A01FSRQE47
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the lumbar motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c26-2 (VCC) - c26-3 (GND) Lumbar 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

  4. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (LUMBAR MOTOR)


    1. A01FR07E74
      Text in Illustration
      *a

      Component with harness connected

      (Lumbar Support Adjuster Assembly RH [Lumbar Motor])

      Reconnect the lumbar motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c26-2 (VCC) - Body ground Lumbar 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 RH (LUMBAR MOTOR) Click here

    D

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

    A

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  5. 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
      c3-13 (SSLB) - c26-2 (VCC) Always Below 1 Ω
      c2-20 (SGND) - c26-3 (GND) Always Below 1 Ω
      c3-13 (SSLB) - 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 LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (LUMBAR MOTOR)


    1. A01FVQQE26
      Text in Illustration
      *a

      Component without harness connected

      (Lumbar Support Adjuster Assembly RH [Lumbar Motor])

      Disconnect the c26 lumbar motor connector.

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

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 1 (H)

      Battery negative (-) → 4 (R)

      		 Forward

      Battery positive (+) → 4 (R)

      Battery negative (-) → 1 (H)

      		 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 RH (LUMBAR MOTOR) Click here

    C

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

    A

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


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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c3-5 (L+) - c26-1 (H) Always Below 1 Ω
      c2-3 (L-) - c26-4 (R) Always Below 1 Ω
      c3-5 (L+) - Body ground Always 10 kΩ or higher
      c2-3 (L-) - 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 (LUMBAR SLIDE)


    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
      Lumbar Slide Lumbar sliding operation Front / OFF / Rear -
      OK
      Motor operates normally.

    NG

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

    OK

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


    1. A01FSRQE46
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the lumbar motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d31-2 (VCC) - d31-3 (GND) Lumbar 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

  10. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (LUMBAR MOTOR)


    1. A01FR07E73
      Text in Illustration
      *a

      Component with harness connected

      (Lumbar Support Adjuster Assembly LH [Lumbar Motor])

      Reconnect the lumbar motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d31-2 (VCC) - Body ground Lumbar switch on 4.5 to 4.8 V

    NG

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

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  11. 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
      d4-13 (SSLB) - d31-2 (VCC) Always Below 1 Ω
      d5-20 (SGND) - d31-3 (GND) Always Below 1 Ω
      d4-13 (SSLB) - 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 LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (LUMBAR MOTOR)


    1. A01FVQQE27
      Text in Illustration
      *a

      Component without harness connected

      (Lumbar Support Adjuster Assembly LH [Lumbar Motor])

      Disconnect the d31 lumbar motor connector.

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

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 1 (H1)

      Battery negative (-) → 4 (R1)

      		 Forward

      Battery positive (+) → 4 (R1)

      Battery negative (-) → 1 (H1)

      		 Backward

    NG

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

    OK

  13. 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
      d4-5 (L+) - d31-1 (H1) Always Below 1 Ω
      d5-3 (L-) - d31-4 (R1) Always Below 1 Ω
      d4-5 (L+) - Body ground Always 10 kΩ or higher
      d5-3 (L-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here