FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2658

DTC Code DTC Name
B2658 Short in Sensor with Motor Power Supply Circuit

DESCRIPTION


This DTC is stored when a power seat motor operates (a position control sensor is being supplied with power) and the power supply voltage does not rise to the specified value.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2658 Short in Sensor with Motor Power Supply Circuit Problem with the voltage supplied to the position control sensor.

  • Position control ECU assembly LH

  • Position control ECU assembly RH

  • Front seat adjuster assembly LH

  • Front seat adjuster assembly RH

  • Power seat tilt motor assembly LH*1 or RH*2

  • Power seat lifter motor assembly RH

  • Power seat lifter motor assembly LH

  • Front seatback frame sub-assembly LH

  • Front seatback frame sub-assembly RH

  • Front seat headrest assembly LH*3

  • Front seat headrest assembly RH*3

  • Harness or connector

WIRING DIAGRAM


  1. for Driver Seat

    Figure 1. for LHD:

    B004AYTE04

    Figure 2. for RHD:

    B004AYTE05

  2. for Front Passenger Seat

    Figure 3. for LHD:

    B004BHKE05

    Figure 4. for RHD:

    B004BHKE06

CAUTION / NOTICE / HINT

Note

Initializing the position control ECU assembly will clear the seat position memory.

Tech Tips


  • Make sure to initialize the position control ECU assembly after replacing the seat assembly or any related parts (including removal and installation).

  • Before initializing the seat ECU, make sure that the D/C CUT fuse is normal.

  • When any of the following conditions are met, the seat position Information in the position control ECU assembly will be cleared.


    • The power switch is turned off with any of the seat switches being operated and the D/C CUT fuse removed.

    • The power switch is turned off within 1 second of any of the seat switches being operated with the D/C CUT fuse removed.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Driver Seat > Clear DTCs
      Body Electrical > Passenger Seat > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Driver Seat > Trouble Codes
      Body Electrical > Passenger Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Result Proceed to
      DTC B2658 is not output A
      DTC B2658 output from "Driver Seat" B
      DTC B2658 output from "Front Passenger Seat" C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (SLIDE MOTOR)) Click here

    B

  3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (SLIDE MOTOR))


    1. for LHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the w1 front seat adjuster assembly LH (slide motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-26 (SSRS) - w1-2 Always Below 1 Ω
        w12-26 (SSRS) or w1-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - w1-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the v1 front seat adjuster assembly RH (slide motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-26 (SSRS) - v1-2 Always Below 1 Ω
        v12-26 (SSRS) or v1-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - v1-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK POSITION CONTROL ECU ASSEMBLY (SLIDE MOTOR CIRCUIT)


    1. B004BW4C08
      *a

      Front view of wire harness connector

      (to Front Seat Adjuster Assembly LH (Slide Motor))

      for LHD:


      1. Disconnect the front seat adjuster assembly LH (slide motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        w1-2 - w1-3 Slide switch on 4.8 to 5.1 V
    2. B004BW4C49
      *a

      Front view of wire harness connector

      (to Front Seat Adjuster Assembly RH (Slide Motor))

      for RHD:


      1. Disconnect the front seat adjuster assembly RH (slide motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        v1-2 - v1-3 Slide switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - POWER SEAT TILT MOTOR ASSEMBLY)


    1. for LHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the w2 poewr seat tilt motor assembly LH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-10 (SSFV) - w2-2 Always Below 1 Ω
        w12-10 (SSFV) or w2-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - w2-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the v19 poewr seat tilt motor assembly RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-10 (SSFV) - v19-2 Always Below 1 Ω
        v12-10 (SSFV) or v19-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - v19-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK POSITION CONTROL ECU ASSEMBLY (TILT MOTOR CIRCUIT)


    1. B004BW4C12
      *a

      Front view of wire harness connector

      (to Power Seat Tilt Motor Assembly LH)

      for LHD:


      1. Disconnect the power seat tilt motor assembly LH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        w2-2 - w2-3 Tilt switch on 4.8 to 5.1 V
    2. B004BW4C50
      *a

      Front view of wire harness connector

      (to Power Seat Tilt Motor Assembly RH)

      for RHD:


      1. Disconnect the power seat tilt motor assembly RH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        v19-2 - v19-3 Tilt switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - POWER SEAT LIFTER MOTOR ASSEMBLY)


    1. for LHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the w3 poewr seat lifter motor assembly LH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-25 (SSRL) - w3-2 Always Below 1 Ω
        w12-25 (SSRL) or w3-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - w3-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the v2 poewr seat lifter motor assembly RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-25 (SSRL) - v2-2 Always Below 1 Ω
        v12-25 (SSRL) or v2-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - v2-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK POSITION CONTROL ECU ASSEMBLY (LIFTER MOTOR CIRCUIT)


    1. B004BW4C13
      *a

      Front view of wire harness connector

      (to Power Seat Lifter Motor Assembly LH)

      for LHD:


      1. Disconnect the power seat lifter motor assembly LH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        w3-2 - w3-3 Lifter switch on 4.8 to 5.1 V
    2. B004BW4C51
      *a

      Front view of wire harness connector

      (to Power Seat Lifter Motor Assembly RH)

      for RHD:


      1. Disconnect the power seat lifter motor assembly RH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        v2-2 - v2-3 Lifter switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR))


    1. for LHD


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the y2 front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-11 (SSRR) - y2-2 Always Below 1 Ω
        w12-11 (SSRR) or y2-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - y2-3 Always Below 1 Ω

    2. for RHD


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the x2 front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-11 (SSRR) - x2-2 Always Below 1 Ω
        v12-11 (SSRR) or x2-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - x2-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK POSITION CONTROL ECU ASSEMBLY (RECLINING MOTOR CIRCUIT)


    1. B004BW4C10
      *a

      Front view of wire harness connector

      (to Front Seatback Frame Sub-assembly LH (Reclining Motor))

      for LHD:


      1. Disconnect the front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        y2-2 - y2-3 Reclining switch on 4.8 to 5.1 V
    2. B004BW4C52
      *a

      Front view of wire harness connector

      (to Front Seatback Frame Sub-assembly RH (Reclining Motor))

      for RHD:


      1. Disconnect the front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        x2-2 - x2-3 Reclining switch on 4.8 to 5.1 V
      Result
      Result Proceed to
      OK (for Standard Seat Type) A
      OK (for Sports Seat Type) B
      NG C

    B

    GO TO STEP 14 Click here

    C

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    A

  11. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT HEADREST ASSEMBLY (HEADREST MOTOR))


    1. for LHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the y5 front seat headrest assembly LH (headrest motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-24 (SSRH) - y5-2 Always Below 1 Ω
        w12-24 (SSRH) or y5-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - y5-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the x5 front seat headrest assembly RH (headrest motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-24 (SSRH) - x5-2 Always Below 1 Ω
        v12-24 (SSRH) or x5-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - x5-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK POSITION CONTROL ECU ASSEMBLY (HEADRST MOTOR CIRCUIT)


    1. B004BIXC03
      *a

      Front view of wire harness connector

      (to Front Seat Headrst Assembly LH (Headrset Motor))

      for LHD:


      1. Disconnect the front seat headrest assembly LH (headrest motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        y5-2 - y5-3 Headrest switch on 4.8 to 5.1 V
    2. B004BIXC12
      *a

      Front view of wire harness connector

      (to Front Seat Headrst Assembly RH (Headrset Motor))

      for RHD:


      1. Disconnect the front seat headrest assembly RH (headrest motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        x5-2 - x5-3 Headrest switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  13. CHECK FRONT SEAT HEADREST ASSEMBLY


    1. Temporarily replace the front seat headrest assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT SEAT HEADREST ASSEMBLY WAS DEFECTIVE)

    NG

  14. CHECK POWER SEAT LIFTER MOTOR ASSEMBLY


    1. Temporarily replace the power seat lifter motor assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (POWER SEAT LIFTER MOTOR ASSEMBLY WAS DEFECTIVE)

    NG

  15. CHECK POWER SEAT TILT MOTOR ASSEMBLY


    1. Temporarily replace the power seat tilt motor assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (POWER SEAT TILT MOTOR ASSEMBLY WAS DEFECTIVE)

    NG

  16. CHECK FRONT SEAT ADJUSTER ASSEMBLY


    1. Temporarily replace the front seat adjuster assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT SEAT ADJUSTER ASSEMBLY WAS DEFECTIVE)

    NG

  17. CHECK FRONT SEATBACK FRAME SUB-ASSEMBLY


    1. Temporarily replace the front seatback frame sub-assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT SEATBACK FRAME SUB-ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  18. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (SLIDE MOTOR))


    1. for LHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the v1 front seat adjuster assembly RH (slide motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-26 (SSRS) - v1-2 Always Below 1 Ω
        v12-26 (SSRS) or v1-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - v1-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the w1 front seat adjuster assembly LH (slide motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-26 (SSRS) - w1-2 Always Below 1 Ω
        w12-26 (SSRS) or w1-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - w1-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. CHECK POSITION CONTROL ECU ASSEMBLY (SLIDE MOTOR CIRCUIT)


    1. B004BW4C09
      *a

      Front view of wire harness connector

      (to Front Seat Adjuster Assembly RH (Slide Motor))

      for LHD:


      1. Disconnect the front seat adjuster assembly RH (slide motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        v1-2 - v1-3 Slide switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG
    2. B004BW4C53
      *a

      Front view of wire harness connector

      (to Front Seat Adjuster Assembly LH (Slide Motor))

      for RHD:


      1. Disconnect the front seat adjuster assembly LH (slide motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        w1-2 - w1-3 Slide switch on 4.8 to 5.1 V

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  20. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - POWER SEAT LIFTER MOTOR ASSEMBLY)


    1. for LHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the v2 power seat lifter motor assembly RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-25 (SSRL) - v2-2 Always Below 1 Ω
        v12-25 (SSRL) or v2-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - v2-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the w3 power seat lifter motor assembly LH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-25 (SSRL) - w3-2 Always Below 1 Ω
        w12-25 (SSRL) or w3-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - w3-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  21. CHECK POSITION CONTROL ECU ASSEMBLY (LIFTER MOTOR CIRCUIT)


    1. B004BW4C14
      *a

      Front view of wire harness connector

      (to Power Seat Lifter Motor Assembly RH)

      for LHD:


      1. Disconnect the power seat lifter motor assembly RH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        v2-2 - v2-3 Lifter switch on 4.8 to 5.1 V
    2. B004BW4C54
      *a

      Front view of wire harness connector

      (to Power Seat Lifter Motor Assembly LH)

      for RHD:


      1. Disconnect the power seat lifter motor assembly LH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        w3-2 - w3-3 Lifter switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  22. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR))


    1. for LHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the x2 front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-11 (SSRS) - x2-2 Always Below 1 Ω
        v12-11 (SSRR) or x2-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - x2-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the y2 front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-11 (SSRS) - y2-2 Always Below 1 Ω
        w12-11 (SSRR) or y2-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - y2-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  23. CHECK POSITION CONTROL ECU ASSEMBLY (RECLINING MOTOR CIRCUIT)


    1. B004BW4C11
      *a

      Front view of wire harness connector

      (to Front Seatback Frame Sub-assembly RH (Reclining Motor))

      for LHD:


      1. Disconnect the front seatback frame sub-assembly RH (reclining motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        x2-2 - x2-3 Reclining switch on 4.8 to 5.1 V
    2. B004BW4C55
      *a

      Front view of wire harness connector

      (to Front Seatback Frame Sub-assembly LH (Reclining Motor))

      for RHD:


      1. Disconnect the front seatback frame sub-assembly LH (reclining motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        y2-2 - y2-3 Reclining switch on 4.8 to 5.1 V
      Result
      Result Proceed to
      OK (for Standard Seat Type) A
      OK (for Sports Seat Type) B
      NG C

    B

    GO TO STEP 26 Click here

    C

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    A

  24. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT HEADREST ASSEMBLY (HEADREST MOTOR))


    1. for LHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the x5 front seat headrest assembly RH (headrest motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-24 (SSRH) - x5-2 Always Below 1 Ω
        v12-24 (SSRH) or x5-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - x5-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the y5 front seat headrest assembly LH (headrest motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-24 (SSRH) - y5-2 Always Below 1 Ω
        w12-24 (SSRH) or y5-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - y5-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  25. CHECK POSITION CONTROL ECU ASSEMBLY (HEADREST MOTOR CIRCUIT)


    1. B004BIXC04
      *a

      Front view of wire harness connector

      (to Front Seat Headrest Assembly RH (Headrest Motor))

      for LHD:


      1. Disconnect the front seat headrest assembly RH (headrest motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        x5-2 - x5-3 Headrest switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG
    2. B004BIXC13
      *a

      Front view of wire harness connector

      (to Front Seat Headrest Assembly LH (Headrest Motor))

      for RHD:


      1. Disconnect the front seat headrest assembly LH (headrest motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        y5-2 - y5-3 Headrest switch on 4.8 to 5.1 V

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  26. CHECK FRONT SEAT HEADREST ASSEMBLY


    1. Temporarily replace the front seat headrest assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT SEAT HEADREST ASSEMBLY WAS DEFECTIVE)

    NG

  27. CHECK POWER SEAT LIFTER MOTOR ASSEMBLY


    1. Temporarily replace the power seat lifter motor assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (POWER SEAT LIFTER MOTOR ASSEMBLY WAS DEFECTIVE)

    NG

  28. CHECK FRONT SEAT ADJUSTER ASSEMBLY


    1. Temporarily replace the front seat adjuster assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT SEAT ADJUSTER ASSEMBLY WAS DEFECTIVE)

    NG

  29. CHECK FRONT SEATBACK FRAME SUB-ASSEMBLY


    1. Temporarily replace the front seatback frame sub-assembly with a new or known good one.

      Click here

    2. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT SEATBACK FRAME SUB-ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here