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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) >> One or more Power Seat Motors do not Operate [12/2019 - ] >> Procedure

One or more Power Seat Motors do not Operate [12/2019 - ]: Procedure

  1. CHECK FRONT POWER SEAT OPERATION 
    1. Check that each function of the power seat operates normally by using the front power seat switch LH.

      Refer to OPERATION CHECK [12/2019 - ]

      Result

      Result Proceed to
      One or more power seat functions do not operate A
      All power seat functions do not operate B

    Result: 

    B 

    GO TO OTHER DIAGNOSIS PROCEDURE (Front Power Seat does not Operate with Front Power Seat Switch) 

    Refer to Front Power Seat does not Operate with Front Power Seat Switch [12/2019 - 11/2023] , or refer to Front Power Seat does not Operate with Front Power Seat Switch [11/2023 - ] 

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (POWER SEAT SWITCH) 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > Driver Seat > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Reclining Rear Reclining switch signal (Rearward) ON or OFF ON: Reclining switch (Rearward) on
      OFF: Reclining switch (Rearward) off      		 -
      Reclining Front Reclining switch signal (Forward) ON or OFF ON: Reclining switch (Forward) on
      OFF: Reclining switch (Forward) off      		 -
      Front Vertical Down Front vertical switch signal (Downward) ON or OFF ON: Front vertical switch (Downward) on
      OFF: Front vertical switch (Downward) off      		 -
      Front Vertical Up Front vertical switch signal (Upward) ON or OFF ON: Front vertical switch (Upward) on
      OFF: Front vertical switch (Upward) off      		 -
      Lifter Switch Down Lifter switch signal (Downward) ON or OFF ON: Lifter switch (Downward) on
      OFF: Lifter switch (Downward) off      		 -
      Lifter Switch Up Lifter switch signal (Upward) ON or OFF ON: Lifter switch (Upward) on
      OFF: Lifter switch (Upward) off      		 -
      Slide Rear Slide switch signal (Rearward) ON or OFF ON: Slide switch (Rearward) on
      OFF: Slide switch (Rearward) off      		 -
      Slide Front Slide switch signal (Forward) ON or OFF ON: Slide switch (Forward) on
      OFF: Slide switch (Forward) off      		 -
      Lumbar Switch Front Lumbar support adjuster switch signal (Forward) ON or OFF ON: Lumbar support adjuster switch (Forward) on
      OFF: Lumbar support adjuster switch (Forward) off      		 -
      Lumbar Switch Rear Lumbar support adjuster switch signal (Rearward) ON or OFF ON: Lumbar support adjuster switch (Rearward) on
      OFF: Lumbar support adjuster switch (Rearward) off      		 -

      Body Electrical > Driver Seat > Data List 

      Tester Display
      Reclining Rear
      Reclining Front
      Front Vertical Down
      Front Vertical Up
      Lifter Switch Down
      Lifter Switch Up
      Slide Rear
      Slide Front
      Lumbar Switch Front
      Lumbar Switch Rear

      OK

      On the GTS screen, ON or OFF is displayed accordingly

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  3

  3. PERFORM ACTIVE TEST USING GTS (POWER SEAT MOTOR) 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Driver Seat > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Seat Reclining Seat reclining operation OFF/Rear/Front -
      Front Vertical Operation Seat front vertical operation OFF/Down/Up -
      Lifter Operation Seat lifter operation OFF/Down/Up -
      Seat Slide Operation Seat slide operation OFF/Rear/Front -
      Lumbar Slide Lumbar support operation (Forward - Rearward) OFF/Rear/Front -

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Seat Reclining

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Front Vertical Operation

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Lifter Operation

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Seat Slide Operation

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Lumbar Slide

      Result

      Result Proceed to
      All power seat functions operate normally A
      Slide function does not operate normally B
      Front vertical function does not operate normally C
      Lifter function does not operate normally D
      Reclining function does not operate normally E
      Lumbar support adjustment function does not operate normally F

    Result: 

    A 

    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: 

    C 

    See step  5

    Result: 

    D 

    See step  6

    Result: 

    E 

    See step  7

    Result: 

    F 

    See step  8

    Result: 

    B 

    See step  4

  4. INSPECT SLIDE MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  9

    Result: 

    NG 

    REPLACE SLIDE MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY) 

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

  5. INSPECT FRONT VERTICAL MOTOR (POWER SEAT TILT MOTOR ASSEMBLY LH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  9

    Result: 

    NG 

    REPLACE FRONT VERTICAL MOTOR (POWER SEAT TILT MOTOR ASSEMBLY LH) 

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

  6. INSPECT LIFTER MOTOR (POWER SEAT LIFTER MOTOR ASSEMBLY LH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  9

    Result: 

    NG 

    REPLACE LIFTER MOTOR (POWER SEAT LIFTER MOTOR ASSEMBLY LH) 

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

  7. INSPECT RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  9

    Result: 

    NG 

    REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY) 

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

  8. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY LH 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH 

    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 - POWER SEAT MOTOR) 
    1. Disconnect the e23 and e24 position control ECU assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.

      HINT: 

      Check the wire harness and connector between the position control ECU assembly and applicable motor.

      Standard Resistance

      SLIDE MOTOR

      Tester Connection Condition Specified Condition
      e23-1 (SLD+) - e11-4 Always Below 1 Ω
      e23-1 (SLD+) or e11-4 - Body ground Always 10 kΩ or higher
      e23-5 (SLD-) - e11-1 Always Below 1 Ω
      e23-5 (SLD-) or e11-1 - Body ground Always 10 kΩ or higher
      FRONT VERTICAL MOTOR

      Tester Connection Condition Specified Condition
      e23-7 (FRV+) - e12-1 Always Below 1 Ω
      e23-7 (FRV+) or e12-1 - Body ground Always 10 kΩ or higher
      e24-4 (FRV-) - e12-4 Always Below 1 Ω
      e24-4 (FRV-) or e12-4 - Body ground Always 10 kΩ or higher
      LIFTER MOTOR

      Tester Connection Condition Specified Condition
      e23-6 (LFT+) - e13-1 Always Below 1 Ω
      e23-6 (LFT+) or e13-1 - Body ground Always 10 kΩ or higher
      e24-5 (LFT-) - e13-4 Always Below 1 Ω
      e24-5 (LFT-) or e13-4 - Body ground Always 10 kΩ or higher
      RECLINING MOTOR

      Tester Connection Condition Specified Condition
      e23-10 (RCL+) - g5-4 Always Below 1 Ω
      e23-10 (RCL+) or g5-4 - Body ground Always 10 kΩ or higher
      e24-6 (RCL-) - g5-1 Always Below 1 Ω
      e24-6 (RCL-) or g5-1 - Body ground Always 10 kΩ or higher
      FRONT LUMBAR SUPPORT MOTOR

      Tester Connection Condition Specified Condition
      e23-9 (L+) - g6-1 Always Below 1 Ω
      e23-9 (L+) or g6-1- Body ground Always 10 kΩ or higher
      e24-3 (L-) - g6-2 Always Below 1 Ω
      e24-3 (L-) or g6-2 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    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: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. INSPECT FRONT POWER SEAT SWITCH LH 

    Refer to INSPECTION [12/2019 - 10/2021] , or refer to INSPECTION [10/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FRONT POWER SEAT SWITCH LH 

    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: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT POWER SEAT SWITCH LH) 
    1. Disconnect the e25 position control ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      GROUND

      Tester Connection Condition Specified Condition
      e17-20 (E) - e25-12 (SGND) Always Below 1 Ω
      SLIDE FUNCTION

      Tester Connection Condition Specified Condition
      e17-6 (SLDR) - e25-23 (SLDR) Always Below 1 Ω
      e17-6 (SLDR) or e25-23 (SLDR) - Body ground Always 10 kΩ or higher
      e17-7 (SLDF) - e25-9 (SLDF) Always Below 1 Ω
      e17-7 (SLDF) or e25-9 (SLDF) - Body ground Always 10 kΩ or higher
      RECLINING FUNCTION

      Tester Connection Condition Specified Condition
      e17-1 (RCLR) - e25-22 (RCLR) Always Below 1 Ω
      e17-1 (RCLR) or e25-22 (RCLR) - Body ground Always 10 kΩ or higher
      e17-2 (RCLF) - e25-8 (RCLF) Always Below 1 Ω
      e17-2 (RCLF) or e25-8 (RCLF) - Body ground Always 10 kΩ or higher
      FRONT VERTICAL FUNCTION

      Tester Connection Condition Specified Condition
      e17-4 (FUP) - e25-6 (FRVU) Always Below 1 Ω
      e17-4 (FUP) or e25-6 (FRVU) - Body ground Always 10 kΩ or higher
      e17-5 (FDWN) - e25-20 (FRVD) Always Below 1 Ω
      e17-5 (FDWN) or e25-20 (FRVD) - Body ground Always 10 kΩ or higher
      LIFTER FUNCTION

      Tester Connection Condition Specified Condition
      e17-3 (LUP) - e25-7 (LFTU) Always Below 1 Ω
      e17-3 (LUP) or e25-7 (LFTU) - Body ground Always 10 kΩ or higher
      e17-8 (LDWN) - e25-21 (LFTD) Always Below 1 Ω
      e17-8 (LDWN) or e25-21 (LFTD) - Body ground Always 10 kΩ or higher
      LUMBAR SUPPORT ADJUSTMENT FUNCTION

      Tester Connection Condition Specified Condition
      e17-17 (R) - e25-18 (LFLR) Always Below 1 Ω
      e17-17 (R) or e25-18 (LFLR) - Body ground Always 10 kΩ or higher
      e17-14 (H) - e25-4 (LFLF) Always Below 1 Ω
      e17-14 (H) or e25-4 (LFLF) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    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: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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