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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Body & Frame >> Seats >> Front Power Seat Control System (W/ Memory) - Diagnostic Codes & Symptom Tests >> FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) >> DTC B2658: Short in Sensor with Motor Power Supply Circuit [12/2019 - ] >> Procedure

DTC B2658: Short in Sensor with Motor Power Supply Circuit [12/2019 - ]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Driver Seat > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Driver Seat > Trouble Codes 

      OK

      DTC B2658 is not output.

      Result

      Result Proceed to
      DTC B2658 is not output A
      DTC B2658 output B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - SLIDE MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY)) 
    1. Disconnect the e25 position control ECU assembly connector.
    2. Disconnect the e11 slide motor (separate type front seat cushion spring assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      e25-26 (SSRS) - e11-2 Always Below 1 Ω
      e25-26 (SSRS) or e11-2 - Body ground Always 10 kΩ or higher
      e25-12 (SGND) - e11-3 Always Below 1 Ω
      e25-12 (SGND) or e11-3 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK POSITION CONTROL ECU ASSEMBLY (SLIDE MOTOR CIRCUIT) 
    1. Reconnect the e11 slide motor (separate type front seat cushion spring assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      e11-2 - e11-3 Slide switch on 4.8 to 5.1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT VERTICAL MOTOR (POWER SEAT TILT MOTOR ASSEMBLY LH)) 
    1. Disconnect the e25 position control ECU assembly connector.
    2. Disconnect the e12 front vertical motor (power 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
      e25-10 (SSFV) - e12-2 Always Below 1 Ω
      e25-10 (SSFV) or e12-2 - Body ground Always 10 kΩ or higher
      e25-12 (SGND) - e12-3 Always Below 1 Ω
      e25-12 (SGND) or e12-3 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK POSITION CONTROL ECU ASSEMBLY (FRONT VERTICAL MOTOR CIRCUIT) 
    1. Reconnect the e12 front vertical motor (power seat tilt motor assembly LH) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      e12-2 - e12-3 Front vertical switch on 4.8 to 5.1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LIFTER MOTOR (POWER SEAT LIFTER MOTOR ASSEMBLY LH)) 
    1. Disconnect the e25 position control ECU assembly connector.
    2. Disconnect the e13 lifter motor (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
      e25-25 (SSRL) - e13-2 Always Below 1 Ω
      e25-25 (SSRL) or e13-2 - Body ground Always 10 kΩ or higher
      e25-12 (SGND) - e13-3 Always Below 1 Ω
      e25-12 (SGND) or e13-3 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK POSITION CONTROL ECU ASSEMBLY (LIFTER MOTOR CIRCUIT) 
    1. Reconnect the e13 lifter motor (power seat lifter motor assembly LH) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      e13-2 - e13-3 Lifter switch on 4.8 to 5.1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY)) 
    1. Disconnect the e25 position control ECU assembly connector.
    2. Disconnect the g5 reclining motor (separate type front seatback spring assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      e25-11 (SSRR) - g5-2 Always Below 1 Ω
      e25-11 (SSRR) or g5-2 - Body ground Always 10 kΩ or higher
      e25-12 (SGND) - g5-3 Always Below 1 Ω
      e25-12 (SGND) or g5-3 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK POSITION CONTROL ECU ASSEMBLY (RECLINING MOTOR CIRCUIT) 
    1. Reconnect the g5 reclining motor (separate type front seatback spring assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      g5-2 - g5-3 Reclining switch on 4.8 to 5.1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  11

  11. REPLACE FRONT VERTICAL MOTOR (POWER SEAT TILT MOTOR ASSEMBLY LH) 
    1. Replace the front vertical motor (power seat tilt motor assembly LH) with a new or known good one.

      Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  12

  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 B2658 is not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (FRONT VERTICAL MOTOR (POWER SEAT TILT MOTOR ASSEMBLY LH) WAS DEFECTIVE) 

    Result: 

    NG 

    See step  13

  13. REPLACE LIFTER MOTOR (POWER SEAT LIFTER MOTOR ASSEMBLY LH) 
    1. Replace the lifter motor (power seat lifter motor assembly LH) with a new or known good one.

      Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  14

  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 B2658 is not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    See step  15

  15. REPLACE SLIDE MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY) 
    1. Replace the slide motor (separate type front seat cushion spring assembly) with a new or known good one.

      Refer to DISASSEMBLY [12/2019 - 10/2021] , or refer to DISASSEMBLY [10/2021 - 11/2023] , or refer to DISASSEMBLY [11/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  16

  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 B2658 is not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY) 

    Result: 

    NG 

    See step  17

  17. REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY) 
    1. Replace the reclining motor (separate type front seatback spring assembly) with a new or known good one.

      Refer to DISASSEMBLY [12/2019 - 10/2021] , or refer to DISASSEMBLY [10/2021 - 11/2023] , or refer to DISASSEMBLY [11/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  18

  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 B2658 is not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY) WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

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