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

  • No. 2 position control ECU assembly

  • Front seat adjuster assembly LH

  • Front seat adjuster assembly RH

  • Front seatback frame sub-assembly LH

  • Front seatback frame sub-assembly RH

  • Front seat headrest insert sub-assembly LH

  • Front seat headrest insert sub-assembly RH

  • Front seat headrest assembly

  • Harness or connector

WIRING DIAGRAM


  1. for Driver Seat:

    Figure 1. for LHD:

    B004VZYE03

    Figure 2. for RHD:

    B004VZYE04

  2. for Front Passenger Seat:

    Figure 3. for LHD:

    B004VZYE05

    Figure 4. for RHD:

    B004VZYE06

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 (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (SLIDE, FRONT TILT, REAR LIFTER, CUSHION MOTOR) Click here

    B

  3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (SLIDE, FRONT TILT, REAR LIFTER, CUSHION MOTOR)


    1. for LHD:


      1. Disconnect the Q28 position control ECU assembly connector.

      2. Disconnect the Q21, Q22, Q23 and Q24 front seat adjuster assembly LH (slide, front tilt, rear lifter, cushion motor) connectors.

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

        Standard Resistance
        Slide Motor
        Tester Connection Condition Specified Condition
        Q28-26 (SSRS) - Q21-2 Always Below 1 Ω
        Q28-26 (SSRS) or Q21-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q21-3 Always Below 1 Ω
        Front Tilt Motor
        Tester Connection Condition Specified Condition
        Q28-25 (SSFV) - Q23-2 Always Below 1 Ω
        Q28-25 (SSFV) or Q23-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q23-3 Always Below 1 Ω
        Rear Lifter Motor
        Tester Connection Condition Specified Condition
        Q28-15 (SSRL) - Q22-2 Always Below 1 Ω
        Q28-15 (SSRL) or Q22-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q22-3 Always Below 1 Ω
        Cushion Motor
        Tester Connection Condition Specified Condition
        Q28-13 (SSRC) - Q24-2 Always Below 1 Ω
        Q28-13 (SSRC) or Q24-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q24-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the Q8 position control ECU assembly connector.

      2. Disconnect the Q1, Q2, Q3 and Q4 front seat adjuster assembly RH (slide, front tilt, rear lifter, cushion motor) connectors.

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

        Standard Resistance
        Slide Motor
        Tester Connection Condition Specified Condition
        Q8-26 (SSRS) - Q1-2 Always Below 1 Ω
        Q8-26 (SSRS) or Q1-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q1-3 Always Below 1 Ω
        Front Tilt Motor
        Tester Connection Condition Specified Condition
        Q8-25 (SSFV) - Q2-2 Always Below 1 Ω
        Q8-25 (SSFV) or Q2-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q2-3 Always Below 1 Ω
        Rear Lifter Motor
        Tester Connection Condition Specified Condition
        Q8-15 (SSRL) - Q3-2 Always Below 1 Ω
        Q8-15 (SSRL) or Q3-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q3-3 Always Below 1 Ω
        Cushion Motor
        Tester Connection Condition Specified Condition
        Q8-13 (SSRC) - Q4-2 Always Below 1 Ω
        Q8-13 (SSRC) or Q4-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q4-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK POSITION CONTROL ECU ASSEMBLY (SLIDE, TILT, LIFTER CUSHION MOTOR CIRCUIT)


    1. for LHD:


      1. Disconnect the front seat adjuster assembly LH (slide, front tilt, rear lifter, cushion motor) connector.

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

        Standard Voltage
        Slide Motor
        Tester Connection Switch Condition Specified Condition
        Q21-2 - Q21-3 Slide switch on 4.8 to 5.1 V
        Front Tilt Motor
        Tester Connection Switch Condition Specified Condition
        Q23-2 - Q23-3 Front vertical switch on 4.8 to 5.1 V
        Rear Lifter Motor
        Tester Connection Switch Condition Specified Condition
        Q22-2 - Q22-3 Rear lifter switch on 4.8 to 5.1 V
        Cushion Motor
        Tester Connection Switch Condition Specified Condition
        Q24-2 - Q24-3 Cushion switch on 4.8 to 5.1 V

    2. for RHD:


      1. Disconnect the front seat adjuster assembly RH (slide, front tilt, rear lifter, cushion motor) connector.

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

        Standard Voltage
        Slide Motor
        Tester Connection Switch Condition Specified Condition
        Q1-2 - Q1-3 Slide switch on 4.8 to 5.1 V
        Front Tilt Motor
        Tester Connection Switch Condition Specified Condition
        Q2-2 - Q2-3 Front vertical switch on 4.8 to 5.1 V
        Rear Lifter Motor
        Tester Connection Switch Condition Specified Condition
        Q3-2 - Q3-3 Rear lifter switch on 4.8 to 5.1 V
        Cushion Motor
        Tester Connection Switch Condition Specified Condition
        Q4-2 - Q4-3 Cushion 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 - FRONT SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR))


    1. for LHD


      1. Disconnect the Q28 position control ECU assembly connector.

      2. Disconnect the S15 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
        Q28-24 (SSRR) - S15-2 Always Below 1 Ω
        Q28-24 (SSRR) or S15-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - S15-3 Always Below 1 Ω

    2. for RHD


      1. Disconnect the Q8 position control ECU assembly connector.

      2. Disconnect the S1 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
        Q8-24 (SSRR) - S1-2 Always Below 1 Ω
        Q8-24 (SSRR) or S1-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - S1-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. 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
        S15-2 - S15-3 Reclining switch on 4.8 to 5.1 V

    2. 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
        S1-2 - S1-3 Reclining 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 - FRONT SEAT HEADREST INSERT SUB-ASSEMBLY (HEADREST UP/DOWN, FRONT/REAR MOTOR))


    1. for LHD:


      1. Disconnect the Q28 position control ECU assembly LH connector.

      2. Disconnect the S17 front seat headrest insert sub-assembly LH (headrest up/down, front/rear motor) connector.

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

        Standard Resistance
        Headrest Up/Down Motor
        Tester Connection Condition Specified Condition
        Q28-14 (SSRH) - S17-3 Always Below 1 Ω
        Q28-14 (SSRH) or S17-3 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - S17-2 Always Below 1 Ω
        Headrest Front/Rear Motor
        Tester Connection Condition Specified Condition
        Q28-11 (SSHD) - S17-7 Always Below 1 Ω
        Q28-11 (SSHD) or S17-7 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - S17-6 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the Q8 position control ECU assembly RH connector.

      2. Disconnect the S9 front seat headrest insert sub-assembly RH (headrest up/down, front/rear motor) connector.

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

        Standard Resistance
        Headrest Up/Down Motor
        Tester Connection Condition Specified Condition
        Q8-14 (SSRH) - S9-3 Always Below 1 Ω
        Q8-14 (SSRH) or S9-3 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - S9-2 Always Below 1 Ω
        Headrest Front/Rear Motor
        Tester Connection Condition Specified Condition
        Q8-11 (SSHD) - S9-7 Always Below 1 Ω
        Q8-11 (SSHD) or S9-7 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - S9-6 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK POSITION CONTROL ECU ASSEMBLY (HEADREST UP/DOWN MOTOR CIRCUIT)


    1. for LHD:


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

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        S17-2 - S17-3 Headrest switch on 4.8 to 5.1 V

    2. 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
        S1-2 - S1-3 Headrest switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

  9. CHECK FRONT SEAT HEADREST ASSEMBLY


    1. Temporarily replace the front seat headrest assembly with front passenger seat's one.

    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

    REPLACE FRONT SEAT HEADREST ASSEMBLY

    NG

  10. CHECK FRONT SEAT HEADREST INSERT SUB-ASSEMBLY


    1. Temporarily replace the front seat headrest insert 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 SEAT ADJUSTER INSERT SUB-ASSEMBLY WAS DEFECTIVE)

    NG

  11. 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

  12. 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

  13. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (SLIDE, FRONT TILT, REAR LIFTER, CUSHION MOTOR)


    1. for LHD:


      1. Disconnect the Q8 No. 2 position control ECU assembly connector.

      2. Disconnect the Q1, Q2, Q3 and Q4 front seat adjuster assembly RH (slide, front tilt, rear lifter, cushion motor) connectors.

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

        Standard Resistance
        Slide Motor
        Tester Connection Condition Specified Condition
        Q8-26 (SSRS) - Q1-2 Always Below 1 Ω
        Q8-26 (SSRS) or Q1-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q1-3 Always Below 1 Ω
        Front Tilt Motor
        Tester Connection Condition Specified Condition
        Q8-25 (SSFV) - Q2-2 Always Below 1 Ω
        Q8-25 (SSFV) or Q2-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q2-3 Always Below 1 Ω
        Rear Lifter Motor
        Tester Connection Condition Specified Condition
        Q8-15 (SSRL) - Q3-2 Always Below 1 Ω
        Q8-15 (SSRL) or Q3-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q3-3 Always Below 1 Ω
        Cushion Motor
        Tester Connection Condition Specified Condition
        Q8-13 (SSRC) - Q4-2 Always Below 1 Ω
        Q8-13 (SSRC) or Q4-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q4-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the Q28 No. 2 position control ECU assembly connector.

      2. Disconnect the Q21, Q22, Q23 and Q24 front seat adjuster assembly LH (slide, front tilt, rear lifter, cushion motor) connectors.

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

        Standard Resistance
        Slide Motor
        Tester Connection Condition Specified Condition
        Q28-26 (SSRS) - Q21-2 Always Below 1 Ω
        Q28-26 (SSRS) or Q21-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q21-3 Always Below 1 Ω
        Front Tilt Motor
        Tester Connection Condition Specified Condition
        Q28-25 (SSFV) - Q23-2 Always Below 1 Ω
        Q28-25 (SSFV) or Q23-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q23-3 Always Below 1 Ω
        Rear Lifter Motor
        Tester Connection Condition Specified Condition
        Q28-15 (SSRL) - Q22-2 Always Below 1 Ω
        Q28-15 (SSRL) or Q22-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q22-3 Always Below 1 Ω
        Cushion Motor
        Tester Connection Condition Specified Condition
        Q28-13 (SSRC) - Q24-2 Always Below 1 Ω
        Q28-13 (SSRC) or Q24-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q24-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK POSITION CONTROL ECU ASSEMBLY NO.2 (SLIDE, TILT, LIFTER CUSHION MOTOR CIRCUIT)


    1. for LHD:


      1. Disconnect the front seat adjuster assembly RH (slide, front tilt, rear lifter, cushion motor) connector.

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

        Standard Voltage
        Slide Motor
        Tester Connection Switch Condition Specified Condition
        Q1-2 - Q1-3 Slide switch on 4.8 to 5.1 V
        Front Tilt Motor
        Tester Connection Switch Condition Specified Condition
        Q2-2 - Q2-3 Front vertical switch on 4.8 to 5.1 V
        Rear Lifter Motor
        Tester Connection Switch Condition Specified Condition
        Q3-2 - Q3-3 Rear lifter switch on 4.8 to 5.1 V
        Cushion Motor
        Tester Connection Switch Condition Specified Condition
        Q4-2 - Q4-3 Cushion switch on 4.8 to 5.1 V

    2. for RHD:


      1. Disconnect the front seat adjuster assembly LH (slide, front tilt, rear lifter, cushion motor) connector.

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

        Standard Voltage
        Slide Motor
        Tester Connection Switch Condition Specified Condition
        Q21-2 - Q21-3 Slide switch on 4.8 to 5.1 V
        Front Tilt Motor
        Tester Connection Switch Condition Specified Condition
        Q23-2 - Q23-3 Front vertical switch on 4.8 to 5.1 V
        Rear Lifter Motor
        Tester Connection Switch Condition Specified Condition
        Q22-2 - Q22-3 Rear lifter switch on 4.8 to 5.1 V
        Cushion Motor
        Tester Connection Switch Condition Specified Condition
        Q24-2 - Q24-3 Cushion switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLY Click here

    OK

  15. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR))


    1. for LHD


      1. Disconnect the Q8 No. 2 No. 2 position control ECU assembly connector.

      2. Disconnect the S1 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
        Q8-24 (SSRR) - S1-2 Always Below 1 Ω
        Q8-24 (SSRR) or S1-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - S1-3 Always Below 1 Ω

    2. for RHD


      1. Disconnect the Q28 No. 2 No. 2 position control ECU assembly connector.

      2. Disconnect the S15 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
        Q28-24 (SSRR) - S15-2 Always Below 1 Ω
        Q28-24 (SSRR) or S15-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-13 (SGND) - S15-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK NO. 2 POSITION CONTOL ECU ASSEMBLY (RECLINING MOTOR CIRCUIT)


    1. 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
        S1-2 - S1-3 Reclining switch on 4.8 to 5.1 V

    2. 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
        S15-2 - S15-3 Reclining switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLY Click here

    OK

  17. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEAT HEADREST INSERT SUB-ASSEMBLY (HEADREST UP/DOWN, FRONT/REAR MOTOR))


    1. for LHD:


      1. Disconnect the Q8 No. 2 position control ECU assembly connector.

      2. Disconnect the S9 front seat headrest insert sub-assembly RH (headrest up/down, front/rear motor) connector.

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

        Standard Resistance
        Headrest Up/Down Motor
        Tester Connection Condition Specified Condition
        Q8-14 (SSRH) - S9-3 Always Below 1 Ω
        Q8-14 (SSRH) or S9-3 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - S9-2 Always Below 1 Ω
        Headrest Front/Rear Motor
        Tester Connection Condition Specified Condition
        Q8-11 (SSHD) - S9-7 Always Below 1 Ω
        Q8-11 (SSHD) or S9-7 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - S9-6 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the Q28 No. 2 position control ECU assembly connector.

      2. Disconnect the S17 front seat headrest insert sub-assembly LH (headrest up/down, front/rear motor) connector.

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

        Standard Resistance
        Headrest Up/Down Motor
        Tester Connection Condition Specified Condition
        Q28-14 (SSRH) - S17-3 Always Below 1 Ω
        Q28-14 (SSRH) or S17-3 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - S17-2 Always Below 1 Ω
        Headrest Front/Rear Motor
        Tester Connection Condition Specified Condition
        Q28-11 (SSHD) - S17-7 Always Below 1 Ω
        Q28-11 (SSHD) or S17-7 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - S17-6 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. CHECK NO. 2 POSITION CONTROL ECU ASSEMBLY (HEADREST UP/DOWN MOTOR CIRCUIT)


    1. 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
        S1-2 - S1-3 Headrest switch on 4.8 to 5.1 V

    2. for RHD:


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

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        S17-2 - S17-3 Headrest switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLY Click here

    OK

  19. CHECK FRONT SEAT HEADREST ASSEMBLY


    1. Temporarily replace the front seat headrest assembly with driver seat's one.

    2. Clear the DTCs.


      Body Electrical > Passenger Seat > Clear DTCs

    3. Check for DTCs.


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

    OK

    REPLACE FRONT SEAT HEADREST ASSEMBLY

    NG

  20. CHECK FRONT SEAT HEADREST INSERT SUB-ASSEMBLY


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

      Click here

    2. Clear the DTCs.


      Body Electrical > Passenger Seat > Clear DTCs

    3. Check for DTCs.


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

    OK

    END (FRONT SEAT ADJUSTER INSERT SUB-ASSEMBLY WAS DEFECTIVE)

    NG

  21. 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 > Passenger Seat > Clear DTCs

    3. Check for DTCs.


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

    OK

    END (FRONT SEAT ADJUSTER ASSEMBLY WAS DEFECTIVE)

    NG

  22. 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 > Passenger Seat > Clear DTCs

    3. Check for DTCs.


      Body Electrical > Passenger 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 NO. 2 POSITION CONTROL ECU ASSEMBLY Click here