SEAT VIBRATION SYSTEM Position of Seat Vibrator cannot be Adjusted

DESCRIPTION

The position control ECU operates the lumbar motor based on the signals received from the seat vibrator switch to adjust the seat vibrator position.

WIRING DIAGRAM

A000U7XE25
A000ZD4E10
A000ZD4E08

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - BATTERY AND BODY GROUND)


    1. A000YUIE02

      for LH Side:

      Disconnect the f43 ECU connector.

    2. for RH Side:

      Disconnect the f39 ECU connector.

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

      Standard voltage
      for LH Side
      Tester Connection Condition Specified Condition
      f43-3 (VB+) - Body ground Always 11 to 14 V
      for RH Side
      Tester Connection Condition Specified Condition
      f39-3 (VB+) - Body ground Always 11 to 14 V

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

      Standard resistance
      for LH Side
      Tester Connection Condition Specified Condition
      f43-10 (VGND) - Body ground Always Below 1 Ω
      f43-23 (SGND) - Body ground Always Below 1 Ω
      for RH Side
      Tester Connection Condition Specified Condition
      f39-10 (VGND) - Body ground Always Below 1 Ω
      f39-23 (SGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK POSITION CONTROL ECU (SWITCH CIRCUIT)


    1. A000TBAE02

      Remove the position control ECU with its connectors still connected

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

      Standard voltage
      for LH Side
      Tester Connection Switch Condition Specified Condition
      f43-21 (MSW) - Body ground

      Power switch on (IG)

      Lumbar switch (rearward) ON

      		 Below 1 V

      Power switch on (IG)

      Lumbar switch (forward) ON

      		 2 to 3 V
      Other than above 4 to 5 V
      for RH Side
      Tester Connection Switch Condition Specified Condition
      f39-21 (MSW) - Body ground

      Power switch on (IG)

      Lumbar switch (rearward) ON

      		 Below 1 V

      Power switch on (IG)

      Lumbar switch (forward) ON

      		 2 to 3 V
      Other than above 4 to 5 V

    NG

    CHECK SEAT TYPE Click here

    OK

  3. INSPECT SEPARATE TYPE REAR SEATBACK ASSEMBLY (LUMBAR MOTOR)


    1. A000VGFE28
      *1 Component without harness connected: (Lumbar Motor)

      Check the operation of the lumbar motor.


      1. Apply battery voltage to the lumbar motor.

      2. Check that the lumbar support adjuster moves smoothly.

        OK
        for LH Side
        Measurement Condition Operation Direction

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Forward

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Backward
        for RH Side
        Measurement Condition Operation Direction

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Forward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Backward
        Result
        Result Proceed to
        OK A
        NG (w/o Ottoman) B
        NG (w/ Ottoman) C

    B

    REPLACE SEPARATE TYPE REAR SEATBACK ASSEMBLY Click here

    C

    REPLACE SEPARATE TYPE REAR SEATBACK ASSEMBLY Click here

    A

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


    1. for LH Side:

      A00104RE03

      1. Disconnect the f43 ECU connector.

      2. Disconnect the f44 motor connector.

    2. for RH Side:


      1. Disconnect the f39 ECU connector.

      2. Disconnect the f41 motor connector.

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

      Standard resistance
      for LH Side
      Tester Connection Condition Specified Condition
      f43-1 (LVM+) - f44-2 Always Below 1 Ω
      f43-2 (LVM-) - f44-1 Always Below 1 Ω
      f43-1 (LVM+) - Body ground Always 10 kΩ or higher
      f43-2 (LVM-) - Body ground Always 10 kΩ or higher
      for RH Side
      Tester Connection Condition Specified Condition
      f39-1 (LVM+) - f41-1 Always Below 1 Ω
      f39-2 (LVM-) - f41-2 Always Below 1 Ω
      f39-1 (LVM+) - Body ground Always 10 kΩ or higher
      f39-2 (LVM-) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/ Ottoman) A
      OK (w/o Ottoman) B
      NG C

    B

    REPLACE POSITION CONTROL ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  5. CHECK SEAT TYPE


    1. Check seat type.

      Result
      Result Proceed to
      for 4-Passenger with Ottoman A
      for 5-Passenger with Ottoman B

    B

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - SEAT VIBRATOR SWITCH AND BODY GROUND) Click here

    A

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - SEAT VIBRATOR SWITCH AND BODY GROUND)


    1. for LH Side:

      A000TUKE03

      Disconnect the f43 ECU connector.

    2. Disconnect the Y6 switch connector.

    3. for RH Side:

      Disconnect the f39 ECU connector.

    4. Disconnect the Y6 switch connector.

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

      Standard resistance
      for LH Side
      Tester Connection Condition Specified Condition
      f43-21 (MSW) - Y6-9 (MSWL) Always Below 1 Ω
      Y6-10 (E2) - Body ground Always Below 1 Ω
      f43-21 (MSW) - Body ground Always 10 kΩ or higher
      for RH Side
      Tester Connection Condition Specified Condition
      f39-21 (MSW) - Y6-7 (MSWR) Always Below 1 Ω
      Y6-10 (E2) - Body ground Always Below 1 Ω
      f39-21 (MSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK SEAT VIBRATOR SWITCH (OPERATION)


    1. Replace the seat vibrator switch with a new or normally operating one. Perform an operation inspection.

      OK
      Lumbar motor operates normally.

    OK

    END (SEAT VIBRATOR SWITCH IS DEFECTIVE)

    NG

    REPLACE POSITION CONTROL ECU Click here

  8. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - SEAT VIBRATOR SWITCH AND BODY GROUND)

    Tech Tips

    *1: LH Side

    *2: RH Side


    1. for LHD:

      A000V0TE02

      1. Disconnect the f43*1 or f39*2 ECU connector.

      2. Disconnect the z88*1 or z89*2 switch connector.

    2. for RHD:

      A000ZWSE02

      1. Disconnect the f43*1 or f39*2 ECU connector.

      2. Disconnect the z89*1 or z88*2 switch connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      f43-21 (MSW) - z89-2 (MSWLR)*1 Always Below 1 Ω
      z89-4 (E3) - Body ground*1 Always Below 1 Ω
      f43-21 (MSW) - Body ground*1 Always 10 kΩ or higher
      f39-21 (MSW) - z88-4 (MSWR)*2 Always Below 1 Ω
      z88-14 (E) - Body ground*2 Always Below 1 Ω
      f39-21 (MSW) - Body ground*2 Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      f43-21 (MSW) - z88-4 (MSWR)*1 Always Below 1 Ω
      z88-14 (E) - Body ground*1 Always Below 1 Ω
      f43-21 (MSW) - Body ground*1 Always 10 kΩ or higher
      f39-21 (MSW) - z89-2 (MSWL)*2 Always Below 1 Ω
      z89-4 (E3) - Body ground*2 Always Below 1 Ω
      f39-21 (MSW) - Body ground*2 Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK SEAT VIBRATOR SWITCH (OPERATION)


    1. Replace the seat vibrator switch with a new or normally operating one. Perform an operation inspection.

      OK
      Lumbar motor operates normally.

    OK

    END (SEAT VIBRATOR SWITCH IS DEFECTIVE)

    NG

    REPLACE POSITION CONTROL ECU Click here