FRONT POWER SEAT CONTROL SYSTEM (for RHD), Diagnostic DTC:B2659

DTC Code DTC Name
B2659 Side Support Sensor Circuit

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
B2659 The paddle open and paddle close lock detection position of the sensor is the same.

  • Position control ECU assembly

  • Front seat back support RH (Side support motor)*1

  • Front seat back support LH (Side support motor)*2

  • Harness or connector

WIRING DIAGRAM


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

    A01FQI6E40

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

    A01FQI6E41

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 (SIDE SUPPORT OPERATION) Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (SIDE 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
      Side Support Operation Side support operation Open / OFF / Close -
      OK
      Motor operates normally.

    NG

    INSPECT FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR) Click here

    OK

  3. CHECK POSITION CONTROL ECU ASSEMBLY (SIDE SUPPORT MOTOR CIRCUIT)


    1. A01FSRQE85
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Front Seat Back Support RH [Side Support Motor])

      Disconnect the side support motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c28-2 (SISR) - c28-3 (ISRE) Side support switch on 4.8 to 5.1 V

    NG

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

    OK

  4. CHECK FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR)


    1. A01FR07E72
      Text in Illustration
      *a

      Component with harness connected

      (Front Seat Back Support RH [Side Support Motor])

      Reconnect the side support motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c28-2 (SISR) - Body ground Side support 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 BACK SUPPORT RH (SIDE SUPPORT MOTOR) Click here

    D

    REPLACE FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR) Click here

    A

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT BACK SUPPORT 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
      c3-16 (SSIR) - c28-2 (SISR) Always Below 1 Ω
      c2-20 (SGND) - c28-3 (ISRE) Always Below 1 Ω
      c3-16 (SSIR) - 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 BACK SUPPORT RH (SIDE SUPPORT MOTOR)


    1. A01FVQQE21
      Text in Illustration
      *a

      Component without harness connected

      (Front Seat Back Support RH [Side Support Motor])

      Disconnect the c28 side support motor connector.

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

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 4 (ISR+)

      Battery negative (-) → 1 (ISR-)

      		 Paddle Open

      Battery positive (+) → 1 (ISR-)

      Battery negative (-) → 4 (ISR+)

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

    B

    REPLACE FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR) Click here

    C

    REPLACE FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR) Click here

    A

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT BACK SUPPORT 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
      c4-3 (ISR+) - c28-4 (ISR+) Always Below 1 Ω
      c4-6 (ISR-) - c28-1 (ISR-) Always Below 1 Ω
      c4-3 (ISR+) - Body ground Always 10 kΩ or higher
      c4-6 (ISR-) - 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 (SIDE 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
      Side Support Operation Side support operation Open / OFF / Close -
      OK
      Motor operates normally.

    NG

    INSPECT FRONT SEAT BACK SUPPORT LH (SIDE SUPPORT MOTOR) Click here

    OK

  9. CHECK POSITION CONTROL ECU ASSEMBLY (SIDE SUPPORT MOTOR CIRCUIT)


    1. A01FSRQE86
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Front Seat Back Support LH [Side Support Motor])

      Disconnect the side support motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d30-2 (SISR) - d30-3 (ISRG) Side support switch on 4.8 to 5.1 V

    NG

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

    OK

  10. CHECK FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR)


    1. A01FR07E71
      Text in Illustration
      *a

      Component with harness connected

      (Front Seat Back Support LH [Side Support Motor])

      Reconnect the side support motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d30-2 (SISR) - Body ground Side support switch on 4.5 to 4.8 V

    NG

    REPLACE FRONT SEAT BACK SUPPORT LH (SIDE SUPPORT MOTOR) Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  11. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT BACK SUPPORT 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
      d4-16 (SSIR) - d30-2 (SISR) Always Below 1 Ω
      d5-20 (SGND) - d30-3 (ISRG) Always Below 1 Ω
      d4-16 (SSIR) - 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 BACK SUPPORT LH (SIDE SUPPORT MOTOR)


    1. A01FVQQE22
      Text in Illustration
      *a

      Component without harness connected

      (Front Seat Back Support LH [Side Support Motor])

      Disconnect the d30 side support motor connector.

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

      OK
      Measurement Condition Operational Direction

      Battery positive (+) → 4 (ISR+)

      Battery negative (-) → 1 (ISR-)

      		 Paddle Open

      Battery positive (+) → 1 (ISR+)

      Battery negative (-) → 4 (ISR-)

      		 Paddle Close

    NG

    REPLACE FRONT SEAT BACK SUPPORT LH (SIDE SUPPORT MOTOR) Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT BACK SUPPORT 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
      d3-3 (ISR+) - d30-4 (ISR+) Always Below 1 Ω
      d3-6 (ISR-) - d30-1 (ISR-) Always Below 1 Ω
      d3-3 (ISR+) - Body ground Always 10 kΩ or higher
      d3-6 (ISR-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here