FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) One or more Power Seat Motors do not Operate

DESCRIPTION

When a signal is input into the position control ECU and switch assembly, the ECU manages the signals received from the front power seat switch, and operates each motor. If the position control ECU and switch assembly receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the position control ECU and switch assembly receives 1 signal only.

WIRING DIAGRAM

A004W1RE42
A004W1RE43
A004ZGRE26

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the power seat switch Click here.

      Result
      Result Proceed to
      One or more power seat functions (except lumbar support adjustment function) do not operate A
      All power seat functions do not operate B
      Front vertical and lifter functions do not operate C
      Only lumbar support adjustment function does not operate D

    B

    GO TO OTHER DIAGNOSIS PROCEDURE (Front Power Seat does not Operate with Front Power Seat Swit) Click here

    C

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BATTERY) Click here

    D

    INSPECT LUMBAR SUPPORT ADJUSTMENT SWITCH (POWER SEAT SWITCH ASSEMBLY) Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (POWER SEAT SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Driver Seat / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Driver Seat (Position Control ECU and Switch Assembly)
      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 Sliding switch signal (Rearward) / ON or OFF

      ON: Sliding switch (Rearward) on

      OFF: Sliding switch (Rearward) off

      		 -
      Slide Front Sliding switch signal (Forward) / ON or OFF

      ON: Sliding switch (Forward) on

      OFF: Sliding switch (Forward) off

      		 -
      OK
      ON or OFF is displayed on the intelligent tester according to the table above.

    NG

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    A

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (POWER SEAT MOTOR)


    1. Enter the following menus: Body / Driver Seat / Active Test.

    2. Perform the Active Test according to the display on the intelligent tester.

      Driver Seat (Position Control ECU and Switch Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Seat Reclining Seat reclining operation Front / OFF / Rear -
      Front Vertical Operation Seat front vertical operation Up / OFF / Down -
      Lifter Operation Seat lifter operation Up / OFF / Down -
      Seat Slide Operation Seat sliding operation Front / OFF / Rear -
      Result
      Result Proceed to
      The power seat functions operate normally. A
      Sliding, front vertical or lifter function does not operate normally. B
      Reclining function does not operate normally. C

    A

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    C

    INSPECT SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY Click here

    B

  4. INSPECT SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY


    1. A004VIXE48
      Text in Illustration
      *a

      Component without harness connected

      (Slide Motor (Separate Type Front Seat Cushion Spring Assembly))

      Disconnect the X21*1, X22*1, X23*1, W14*2, W15*2 or W16*2 connector from each motor.


      • *1: for LHD

      • *2: for RHD

      Tech Tips

      Check the motor operation of applicable function.

    2. Check the operation of the slide motor.


      1. Check if the seat cushion moves smoothly when the auxiliary battery is connected to the slide motor connector terminals.

        OK
        Measurement Condition Operational Direction

        Auxiliary battery positive (+) → 2

        Auxiliary battery negative (-) → 1

        		 Seat cushion spring moves forward

        Auxiliary battery positive (+) → 1

        Auxiliary battery negative (-) → 2

        		 Seat cushion spring moves backward
    3. A004VIXE48
      Text in Illustration
      *a

      Component without harness connected

      (Front Vertical Motor (Separate Type Front Seat Cushion Spring Assembly))

      Check the operation of the front vertical motor.


      1. Check if the seat cushion moves smoothly when the auxiliary battery is connected to the front vertical motor connector terminals.

        OK
        Measurement Condition Operational Direction

        Auxiliary battery positive (+) → 2

        Auxiliary battery negative (-) → 1

        		 Seat cushion spring moves upward

        Auxiliary battery positive (+) → 1

        Auxiliary battery negative (-) → 2

        		 Seat cushion spring moves downward
    4. A004VIXE48
      Text in Illustration
      *a

      Component without harness connected

      (Lifter Motor (Separate Type Front Seat Cushion Spring Assembly))

      Check the operation of the lifter motor.


      1. Check if the seat cushion moves smoothly when the auxiliary battery is connected to the lifter motor connector terminals.

        OK
        Measurement Condition Operational Direction

        Auxiliary battery positive (+) → 2

        Auxiliary battery negative (-) → 1

        		 Seat cushion spring moves upward

        Auxiliary battery positive (+) → 1

        Auxiliary battery negative (-) → 2

        		 Seat cushion spring moves downward
        Result
        Result Proceed to
        NG A
        OK B

    A

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Click here

    B

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR) Click here

  5. INSPECT SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY


    1. A004VIXE48
      Text in Illustration
      *a

      Component without harness connected

      (Reclining Motor (Separate Type Front Seatback Spring Assembly))

      Disconnect Z3*1 or Y4*2 reclining motor connector.


      • *1: for LHD

      • *2: for RHD

    2. Check the operation of the reclining motor.


      1. Check if the seatback moves smoothly when the auxiliary battery is connected to the reclining motor connector terminals.

        OK
        Measurement Condition Operational Direction

        Auxiliary battery positive (+) → 2

        Auxiliary battery negative (-) → 1

        		 Seatback moves forward

        Auxiliary battery positive (+) → 1

        Auxiliary battery negative (-) → 2

        		 Seatback moves backward

    OK

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Click here

    NG

    REPLACE SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)


    1. Disconnect the X4*1 or W3*2 position control ECU and switch assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Tech Tips

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      X4-3 (SLD+) - X21-2 Always Below 1 Ω
      X4-4 (SLD-) - X21-1 Always Below 1 Ω
      X4-5 (FRV-) - X22-1 Always Below 1 Ω
      X4-8 (FRV+) - X22-2 Always Below 1 Ω
      X4-10 (LFT+) - X23-2 Always Below 1 Ω
      X4-12 (LFT-) - X23-1 Always Below 1 Ω
      X4-9 (RCL+) - Z3-2 Always Below 1 Ω
      X4-11 (RCL-) - Z3-1 Always Below 1 Ω
      X4-3 (SLD+) - Body ground Always 10 kΩ or higher
      X4-4 (SLD-) - Body ground Always 10 kΩ or higher
      X4-5 (FRV-) - Body ground Always 10 kΩ or higher
      X4-8 (FRV+) - Body ground Always 10 kΩ or higher
      X4-10 (LFT+) - Body ground Always 10 kΩ or higher
      X4-12 (LFT-) - Body ground Always 10 kΩ or higher
      X4-9 (RCL+) - Body ground Always 10 kΩ or higher
      X4-11 (RCL-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      W3-3 (SLD+) - W14-2 Always Below 1 Ω
      W3-4 (SLD-) - W14-1 Always Below 1 Ω
      W3-5 (FRV-) - W15-1 Always Below 1 Ω
      W3-8 (FRV+) - W15-2 Always Below 1 Ω
      W3-10 (LFT+) - W16-2 Always Below 1 Ω
      W3-12 (LFT-) - W16-1 Always Below 1 Ω
      W3-9 (RCL+) - Y4-2 Always Below 1 Ω
      W3-11 (RCL-) - Y4-1 Always Below 1 Ω
      W3-3 (SLD+) - Body ground Always 10 kΩ or higher
      W3-4 (SLD-) - Body ground Always 10 kΩ or higher
      W3-5 (FRV-) - Body ground Always 10 kΩ or higher
      W3-8 (FRV+) - Body ground Always 10 kΩ or higher
      W3-10 (LFT+) - Body ground Always 10 kΩ or higher
      W3-12 (LFT-) - Body ground Always 10 kΩ or higher
      W3-9 (RCL+) - Body ground Always 10 kΩ or higher
      W3-11 (RCL-) - Body ground Always 10 kΩ or higher

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BATTERY)


    1. Disconnect the X5*1 or W4*2 position control ECU and switch assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      X5-12 (SYSB) - Body ground Power switch off 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      W4-12 (SYSB) - Body ground Power switch off 11 to 14 V

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. INSPECT LUMBAR SUPPORT ADJUSTMENT SWITCH (POWER SEAT SWITCH ASSEMBLY)


    1. Remove the lumbar support adjustment switch (power seat switch assembly) Click here.

    2. A004YP3E19
      Text in Illustration
      *1 Hold Switch
      *2 Release Switch
      *a

      Component without harness connected

      (Lumbar Support Adjustment Switch (Power Seat Switch Assembly))

      for LHD:


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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        3 - 5 Hold Below 1 Ω
        1 - 2
        2 - 3 Off
        2 - 1
        2 - 3 Release
        1 - 5
    3. A004YP3E20
      Text in Illustration
      *1 Hold Switch
      *2 Release Switch
      *a

      Component without harness connected

      (Lumbar Support Adjustment Switch (Power Seat Switch Assembly))

      for RHD:


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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        1 - 5 Hold Below 1 Ω
        2 - 3
        2 - 3 Off
        2 - 1
        3 - 5 Release
        1 - 2

    NG

    REPLACE LUMBAR SUPPORT ADJUSTMENT SWITCH (POWER SEAT SWITCH ASSEMBLY) Click here

    OK

  9. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY)


    1. A004VIXE22
      Text in Illustration
      *a

      Component without harness connected

      (Lumbar Support Adjuster Assembly (Separate Type Front Seatback Spring Assembly))

      Disconnect Z2*1 or Y5*2 lumbar support adjuster assembly connector.


      • *1: for LHD

      • *2: for RHD

    2. Check the operation of the lumbar support adjuster assembly.


      1. Check that the seatback moves smoothly when the auxiliary battery is connected to the lumbar support adjuster assembly connector terminals.

        OK
        Measurement Condition Operational Direction

        Auxiliary battery positive (+) → 1

        Auxiliary battery negative (-) → 2

        		 Seatback moves forward

        Auxiliary battery positive (+) → 2

        Auxiliary battery negative (-) → 1

        		 Seatback moves backward

    NG

    REPLACE SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (LUMBAR SWITCH - POSITION CONTROL ECU AND LUMBAR MOTOR)


    1. Disconnect the X4*1 or W3*2 position control ECU and switch assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      X4-6 (+B2) - X6-5 Always Below 1 Ω
      X4-1 (GND2) - X6-2 Always Below 1 Ω
      X6-3 - Z2-1 Always Below 1 Ω
      X6-1 - Z2-2 Always Below 1 Ω
      X6-5 - Body ground Always 10 kΩ or higher
      X6-2 - Body ground Always 10 kΩ or higher
      X6-3 - Body ground Always 10 kΩ or higher
      X6-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      W3-6 (+B2) - W5-5 Always Below 1 Ω
      W3-1 (GND2) - W5-2 Always Below 1 Ω
      W5-3 - Y5-2 Always Below 1 Ω
      W5-1 - Y5-1 Always Below 1 Ω
      W5-5 - Body ground Always 10 kΩ or higher
      W5-2 - Body ground Always 10 kΩ or higher
      W5-3 - Body ground Always 10 kΩ or higher
      W5-1 - Body ground Always 10 kΩ or higher

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR