REAR 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

  • Rear No. 2 seat adjuster assembly

  • Rear No. 1 seat adjuster assembly

  • Rear No. 2 seat headrest adjuster sub-assembly

  • Rear No. 1 seat headrest adjuster sub-assembly

  • Rear seat adjuster sub-assembly LH

  • Rear seat adjuster sub-assembly RH

  • Harness or connector

WIRING DIAGRAM


  1. for Rear Seat RH:

    Figure 1. for LHD:

    B006GB6E05
    B006D3DE02

    Figure 2. for RHD:

    B006BDOE04

  2. for Rear Seat LH:

    Figure 3. for LHD:

    B006BDOE06

    Figure 4. for RHD:

    B006GB6E06
    B006D3DE03
    *a Reclining Motor
    *b Rear Seat Reclining Adjuster Sub-assembly LH
    *c Position Control ECU Assembly LH

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

    • The engine 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 > Rear Right Seat > Clear DTCs
      Body Electrical > Rear Left Seat > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Rear Right Seat > Trouble Codes
      Body Electrical > Rear Left Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Result Proceed to
      DTC B2658 is not output A
      DTC B2658 output from "Rear Right Seat" B
      DTC B2658 output from "Rear Left Seat" C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH - REAR SEAT ADJUSTER ASSEMBLY) Click here

    B

  3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY RH - REAR SEAT ADJUSTER ASSEMBLY)


    1. for LHD:


      1. Disconnect the R7 position control ECU assembly RH connector.

      2. Disconnect the R1, T6, T13 and T14 rear No. 2 seat adjuster assembly (slide motor, front tilt motor, ottoman up/down motor, ottoman long/short motor) connector.

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

        Standard Resistance
        Slide Motor
        Tester Connection Condition Specified Condition
        R7-12 (SSRS) - R1-2 Always Below 1 Ω
        R7-12 (SSRS) or R1-2 - Other terminals and body ground Always 10 kΩ or higher
        R7-7 (SGND) - R1-3 Always Below 1 Ω
        Front Tilt Motor
        Tester Connection Condition Specified Condition
        R7-11 (SSFV) - T6-2 Always Below 1 Ω
        R7-11 (SSFV) or T6-2 - Other terminals and body ground Always 10 kΩ or higher
        R7-7 (SGND) - T6-3 Always Below 1 Ω
        Ottoman Up/Down Motor
        Tester Connection Condition Specified Condition
        R7-27 (SOTG) - T13-2 Always Below 1 Ω
        R7-27 (SOTG) or T13-2 - Other terminals and body ground Always 10 kΩ or higher
        R7-7 (SGND) - T13-3 Always Below 1 Ω
        Ottoman Long/Short Motor
        Tester Connection Condition Specified Condition
        R7-10 (SOTE) - T14-3 Always Below 1 Ω
        R7-10 (SOTE) or T14-3 - Other terminals and body ground Always 10 kΩ or higher
        R7-7 (SGND) - T14-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the R7 position control ECU assembly RH connector.

      2. Disconnect the R1 and T6 No. 1 seat adjuster assembly (slide motor, front tilt motor) connector.

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

        Standard Resistance
        Slide Motor
        Tester Connection Condition Specified Condition
        R7-12 (SSRS) - R1-2 Always Below 1 Ω
        R7-12 (SSRS) or R1-2 - Other terminals and body ground Always 10 kΩ or higher
        R7-7 (SGND) - R1-3 Always Below 1 Ω
        Front Tilt Motor
        Tester Connection Condition Specified Condition
        R7-11 (SSFV) - T6-2 Always Below 1 Ω
        R7-11 (SSFV) or T6-2 - Other terminals and body ground Always 10 kΩ or higher
        R7-7 (SGND) - T6-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. for LHD:


      1. Disconnect the rear No. 2 seat adjuster assembly (slide motor, front tilt motor, ottoman up/down motor, ottoman long/short 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
        R1-2 - R1-3 Slide switch on 4.8 to 5.1 V
        Front Tilt Motor
        Tester Connection Switch Condition Specified Condition
        T6-2 - T6-3 Front vertical switch on 4.8 to 5.1 V
        Ottoman Up/Down Motor
        Tester Connection Switch Condition Specified Condition
        T13-2 - T13-3 Ottoman switch on 4.8 to 5.1 V
        Ottoman Long/Short Motor
        Tester Connection Switch Condition Specified Condition
        T14-2 - T14-3 Ottoman switch on 4.8 to 5.1 V

    2. for RHD:


      1. Disconnect the rear No. 1 seat adjuster assembly (slide motor, front tilt 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
        R1-2 - R1-3 Slide switch on 4.8 to 5.1 V
        Front Tilt Motor
        Tester Connection Switch Condition Specified Condition
        T6-2 - T6-3 Front vertical switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY RH - REAR SEAT HEADREST ADJUSTER SUB-ASSEMBLY)


    1. Disconnect the R7 position control ECU assembly RH connector.

    2. Disconnect the R2 and R3 rear No. 2 seat headrest adjuster sub-assembly*1 or rear No. 1 seat headrest adjuster sub-assembly*2 (headrest up/down motor, headrest front/rear motor) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      Headrest Up/Down Motor
      Tester Connection Condition Specified Condition
      R7-26 (SSRH) - R2-3 Always Below 1 Ω
      R7-26 (SSRH) or R2-3 - Other terminals and body ground Always 10 kΩ or higher
      R7-7 (SGND) - R2-2 Always Below 1 Ω
      Headrest Front/Rear Motor
      Tester Connection Condition Specified Condition
      R7-25 (SSHD) - R3-4 Always Below 1 Ω
      R7-25 (SSHD) or R3-4 - Other terminals and body ground Always 10 kΩ or higher
      R7-7 (SGND) - R3-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the R2 and R3 rear No. 2 seat headrest adjuster sub-assembly*1 or rear No. 1 seat headrest adjuster sub-assembly*2 (headrest up/down motor, headrest front/rear motor) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      Headrest Up/Down Motor
      Tester Connection Switch Condition Specified Condition
      R2-2 - R2-3 Headrest switch on 4.8 to 5.1 V
      Headrest Front/Rear Motor
      Tester Connection Switch Condition Specified Condition
      R3-2 - R3-3 Headrest switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    OK

  7. CHECK REAR SEAT HEADREST ADJUSTER SUB-ASSEMBLY


    1. Temporarily replace the rear No. 2 seat headrest adjuster sub-assembly*1 or rear No. 1 seat headrest adjuster sub-assembly*2 with a new or known good one.


      • *1: for LHD

      • *2: for RHD

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Rear Right Seat > Clear DTCs

    3. Check for DTCs.

      Click here


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

    OK

    END (REAR SEAT HEADREST ADJUSTER SUB-ASSEMBLY WAS DEFECTIVE)

    NG

  8. CHECK REAR SEAT ADJUSTER ASSEMBLY


    1. Temporarily replace the rear No. 2 seat adjuster assembly*1 or rear No. 1 seat adjuster assembly*2 with a new or known good one.


      • *1: for LHD

      • *2: for RHD

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Rear Right Seat > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Rear Right Seat > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END (REAR SEAT ADJUSTER ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    C

  9. CHECK REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY RH


    1. Temporarily replace the rear seat reclining sub-assembly RH with a new or known good one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Rear Right Seat > Clear DTCs

    3. Check for DTCs.

      Click here


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

    OK

    END (REAR SEAT RECLINING SUB-ASSEMBLY RH WAS DEFECTIVE)

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

  10. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH - REAR SEAT ADJUSTER ASSEMBLY)


    1. for LHD:


      1. Disconnect the R41 position control ECU assembly LH connector.

      2. Disconnect the R35 and T7 No. 1 seat adjuster assembly (slide motor, front tilt motor) connector.

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

        Standard Resistance
        Slide Motor
        Tester Connection Condition Specified Condition
        R41-12 (SSRS) - R35-2 Always Below 1 Ω
        R41-12 (SSRS) or R35-2 - Other terminals and body ground Always 10 kΩ or higher
        R41-7 (SGND) - R35-3 Always Below 1 Ω
        Front Tilt Motor
        Tester Connection Condition Specified Condition
        R41-11 (SSFV) - T7-2 Always Below 1 Ω
        R41-11 (SSFV) or T7-2 - Other terminals and body ground Always 10 kΩ or higher
        R41-7 (SGND) - T7-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the R41 position control ECU assembly LH connector.

      2. Disconnect the R35, T6, T15 and T16 rear No. 2 seat adjuster assembly (slide motor, front tilt motor, ottoman up/down motor, ottoman long/short motor) connector.

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

        Standard Resistance
        Slide Motor
        Tester Connection Condition Specified Condition
        R41-12 (SSRS) - R35-2 Always Below 1 Ω
        R41-12 (SSRS) or R35-2 - Other terminals and body ground Always 10 kΩ or higher
        R41-7 (SGND) - R35-3 Always Below 1 Ω
        Front Tilt Motor
        Tester Connection Condition Specified Condition
        R41-11 (SSFV) - T7-2 Always Below 1 Ω
        R41-11 (SSFV) or T7-2 - Other terminals and body ground Always 10 kΩ or higher
        R41-7 (SGND) - T7-3 Always Below 1 Ω
        Ottoman Up/Down Motor
        Tester Connection Condition Specified Condition
        R41-27 (SOTG) - T15-2 Always Below 1 Ω
        R41-27 (SOTG) or T15-2 - Other terminals and body ground Always 10 kΩ or higher
        R41-7 (SGND) - T15-3 Always Below 1 Ω
        Ottoman Long/Short Motor
        Tester Connection Condition Specified Condition
        R41-10 (SOTE) - T16-3 Always Below 1 Ω
        R41-10 (SOTE) or T16-3 - Other terminals and body ground Always 10 kΩ or higher
        R41-7 (SGND) - T16-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK POSITION CONTROL ECU ASSEMBLY LH (MOTOR CIRCUIT)


    1. for LHD:


      1. Disconnect the rear No. 1 seat adjuster assembly (slide motor, front tilt 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
        R35-2 - R35-3 Slide switch on 4.8 to 5.1 V
        Front Tilt Motor
        Tester Connection Switch Condition Specified Condition
        T7-2 - T7-3 Front vertical switch on 4.8 to 5.1 V

    2. for RHD:


      1. Disconnect the rear No. 2 seat adjuster assembly (slide motor, front tilt motor, ottoman up/down motor, ottoman long/short 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
        R35-2 - R35-3 Slide switch on 4.8 to 5.1 V
        Front Tilt Motor
        Tester Connection Switch Condition Specified Condition
        T7-2 - T7-3 Front vertical switch on 4.8 to 5.1 V
        Ottoman Up/Down Motor
        Tester Connection Switch Condition Specified Condition
        T15-2 - T15-3 Ottoman switch on 4.8 to 5.1 V
        Ottoman Long/Short Motor
        Tester Connection Switch Condition Specified Condition
        T16-2 - T16-3 Ottoman switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH - REAR SEAT HEADREST ADJUSTER SUB-ASSEMBLY)


    1. Disconnect the R41 position control ECU assembly LH connector.

    2. Disconnect the R36 and R37 rear No. 1 seat headrest adjuster sub-assembly*1 or rear No. 2 seat headrest adjuster sub-assembly*2 (headrest up/down motor, headrest front/rear motor) connector.


      • *1: for LHD

      • *2: for LHD

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

      Standard Resistance
      Headrest Up/Down Motor
      Tester Connection Condition Specified Condition
      R41-26 (SSRH) - R36-3 Always Below 1 Ω
      R41-26 (SSRH) or R36-3 - Other terminals and body ground Always 10 kΩ or higher
      R41-7 (SGND) - R36-2 Always Below 1 Ω
      Headrest Front/Rear Motor
      Tester Connection Condition Specified Condition
      R41-25 (SSHD) - R37-4 Always Below 1 Ω
      R41-25 (SSHD) or R37-4 - Other terminals and body ground Always 10 kΩ or higher
      R41-7 (SGND) - R37-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK POSITION CONTROL ECU ASSEMBLY LH (MOTOR CIRCUIT)


    1. Disconnect the R36 and R37 rear No. 1 seat headrest adjuster sub-assembly*1 or rear No. 2 seat headrest adjuster sub-assembly*2 (headrest up/down motor, headrest front/rear motor) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      Headrest Up/Down Motor
      Tester Connection Switch Condition Specified Condition
      R36-2 - R36-3 Headrest switch on 4.8 to 5.1 V
      Headrest Front/Rear Motor
      Tester Connection Switch Condition Specified Condition
      R37-2 - R37-3 Headrest switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    OK

  14. CHECK REAR SEAT HEADREST ADJUSTER SUB-ASSEMBLY


    1. Temporarily replace the rear No. 1 seat headrest adjuster sub-assembly*1 or rear No. 2 seat headrest adjuster sub-assembly*2 with a new or known good one.


      • *1: for LHD

      • *2: for RHD

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Rear Left Seat > Clear DTCs

    3. Check for DTCs.

      Click here


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

    OK

    END (REAR SEAT HEADREST ADJUSTER SUB-ASSEMBLY WAS DEFECTIVE)

    NG

  15. CHECK REAR SEAT ADJUSTER ASSEMBLY


    1. Temporarily replace the rear No. 1 seat adjuster assembly*1 or rear No. 2 seat adjuster assembly*2 with a new or known good one.


      • *1: for LHD

      • *2: for RHD

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Rear Left Seat > Clear DTCs

    3. Check for DTCs.

      Click here


      Chassis > Electric Parking Brake > Trouble Codes
      OK
      DTC B2658 is not output.
      Result
      Result Proceed to
      OK A
      NG (for RHD) B
      NG (for LHD) C

    A

    END (REAR SEAT ADJUSTER ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    C

  16. CHECK REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY LH


    1. Temporarily replace the rear seat reclining sub-assembly LH with a new or known good one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Rear Left Seat > Clear DTCs

    3. Check for DTCs.

      Click here


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

    OK

    END (REAR SEAT RECLINING SUB-ASSEMBLY LH WAS DEFECTIVE)

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here