FRONT POWER SEAT CONTROL SYSTEM(w/ Memory), 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 Slide motor position sensor power supply voltage is low

  • Position control ECU assembly (driver seat)

  • Slide motor (Front seat adjuster assembly (driver seat))

  • Power Seat Tilt Motor Assembly (Driver Seat)

  • Power Seat Lifter Motor Assembly (Driver Seat)

  • Reclining Motor (Front Seatback Frame Sub-assembly (Driver Seat))

  • Wire harness or connector

WIRING DIAGRAM

B0070T8E01

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.


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

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.


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

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

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


    1. Disconnect the a12 position control ECU assembly (driver seat) connector.

    2. Disconnect the a5 slide motor (front seat adjuster assembly (driver seat)) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a12-26 (SSRS) - a5-2 Always Below 1 Ω
      a12-26 (SSRS) or a5-2 - Body ground Always 10 kΩ or higher
      a12-12 (SENG) - a5-3 Always Below 1 Ω
      a12-12 (SENG) or a5-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the a5 slide motor (front seat adjuster assembly (driver seat)) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      a5-2 - a5-3 Slide switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    OK

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


    1. Disconnect the a12 position control ECU assembly (driver seat) connector.

    2. Disconnect the a6 power seat tilt motor assembly (driver seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a12-10 (SSFV) - a6-2 Always Below 1 Ω
      a12-10 (SSFV) or a6-2 - Body ground Always 10 kΩ or higher
      a12-12 (SENG) - a6-3 Always Below 1 Ω
      a12-12 (SENG) or a6-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the a6 power seat tilt motor assembly (driver seat) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      a6-2 - a6-3 Front vertical switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    OK

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


    1. Disconnect the a12 position control ECU assembly (driver seat) connector.

    2. Disconnect the a7 power seat lifter motor assembly (driver seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a12-25 (SSRL) - a7-2 Always Below 1 Ω
      a12-25 (SSRL) or a7-2 - Body ground Always 10 kΩ or higher
      a12-12 (SENG) - a7-3 Always Below 1 Ω
      a12-12 (SENG) or a7-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the a7 power seat lifter motor assembly (driver seat) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      a7-2 - a7-3 Lifter switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    OK

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


    1. Disconnect the a12 position control ECU assembly (driver seat) connector.

    2. Disconnect the o1 reclining motor (front seatback frame sub-assembly (driver seat)) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a12-11 (SSRR) - o1-2 Always Below 1 Ω
      a12-11 (SSRR) or o1-2 - Body ground Always 10 kΩ or higher
      a12-12 (SENG) - o1-3 Always Below 1 Ω
      a12-12 (SENG) or o1-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the o1 reclining motor (front seatback frame sub-assembly (driver seat)) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      o1-2 - o1-3 Reclining switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    OK

  11. REPLACE POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT)


    1. Replace the power seat tilt motor assembly (driver seat) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  12. CHECK FOR DTC


    1. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2685 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT) WAS DEFECTIVE)

    NG

  13. REPLACE POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT)


    1. Replace the power seat lifter motor assembly (driver seat) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  14. CHECK FOR DTC


    1. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2685 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT) WAS DEFECTIVE)

    NG

  15. REPLACE SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT))


    1. Replace the slide motor (front seat adjuster assembly (driver seat)) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  16. CHECK FOR DTC


    1. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2685 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT)) WAS DEFECTIVE)

    NG

  17. REPLACE RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT))


    1. Replace the reclining motor (front seatback frame sub-assembly (driver seat)) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  18. CHECK FOR DTC


    1. Clear the DTCs.


      Body Electrical > Driver Seat > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Driver Seat > Trouble Codes
      OK
      DTC B2685 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT)) WAS DEFECTIVE)

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here