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

A01GMM7E17
A01GLUDE01
A01GLUDE02

INSPECTION PROCEDURE

PROCEDURE


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


    1. A01GLT6E01

      for LH Side:

      Disconnect the f41 ECU connector.

    2. for RH Side:

      Disconnect the f38 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
      f41-3 (VB+) - Body ground Always 11 to 14 V
      for RH Side
      Tester Connection Condition Specified Condition
      f38-3 (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
      f41-10 (VGND) - Body ground Always Below 1 Ω
      f41-23 (SGND) - Body ground Always Below 1 Ω
      for RH Side
      Tester Connection Condition Specified Condition
      f38-10 (VGND) - Body ground Always Below 1 Ω
      f38-23 (SGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK POSITION CONTROL ECU (SWITCH CIRCUIT)


    1. A01GIZXE01

      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
      f41-21 (MSW) - Body ground

      Engine switch on (IG)

      Lumbar switch (rearward) ON

      		 Below 1 V

      Engine 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
      f38-21 (MSW) - Body ground

      Engine switch on (IG)

      Lumbar switch (rearward) ON

      		 Below 1 V

      Engine 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. A01GJANE28

      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. A01GKARE01

      for LH Side:


      1. Disconnect the f41 ECU connector.

      2. Disconnect the f43 motor connector.

    2. for RH Side:


      1. Disconnect the f38 ECU connector.

      2. Disconnect the f40 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
      f41-1 (LVM+) - f43-2 Always Below 1 Ω
      f41-2 (LVM-) - f43-1 Always Below 1 Ω
      f41-1 (LVM+) - Body ground Always 10 kΩ or higher
      f41-2 (LVM-) - Body ground Always 10 kΩ or higher
      for RH Side
      Tester Connection Condition Specified Condition
      f38-1 (LVM+) - f40-1 Always Below 1 Ω
      f38-2 (LVM-) - f40-2 Always Below 1 Ω
      f38-1 (LVM+) - Body ground Always 10 kΩ or higher
      f38-2 (LVM-) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/o Ottoman) A
      OK (w/ 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. A01GLR1E10

      for LH Side:

      Disconnect the f41 ECU connector.

    2. for RH Side:

      Disconnect the f38 ECU connector.

    3. Disconnect the Y6 switch connector.

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

      Standard resistance
      for LH Side
      Tester Connection Condition Specified Condition
      f41-21 (MSW) - Y6-9 (MSWL) Always Below 1 Ω
      Y6-10 (E2) - Body ground Always Below 1 Ω
      f41-21 (MSW) - Body ground Always 10 kΩ or higher
      for RH Side
      Tester Connection Condition Specified Condition
      f38-21 (MSW) - Y6-7 (MSWR) Always Below 1 Ω
      Y6-10 (E2) - Body ground Always Below 1 Ω
      f38-21 (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.

    NG

    REPLACE POSITION CONTROL ECU Click here

    OK

    END (SEAT VIBRATOR SWITCH IS DEFECTIVE)

  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, for 5-Passenger with Ottoman:

      A01GI03E05

      1. Disconnect the f41*1 or f38*2 ECU connector.

      2. Disconnect the r12*1 or r11*2 switch connector.

    2. for RHD, for 5-Passenger with Ottoman:

      A01GI03E06

      1. Disconnect the f41*1 or f38*2 ECU connector.

      2. Disconnect the r12*1 or r11*2 switch connector.

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

      Standard resistance
      for LHD, for 5-Passenger with Ottoman
      Tester Connection Condition Specified Condition
      f41-21 (MSW) - r12-1 (VSWL)*1 Always Below 1 Ω
      r12-4 (E3) - Body ground*1 Always Below 1 Ω
      f41-21 (MSW) - Body ground*1 Always 10 kΩ or higher
      f38-21 (MSW) - r11-9 (MSWR)*2 Always Below 1 Ω
      r11-14 (E) - Body ground*2 Always Below 1 Ω
      f38-21 (MSW) - Body ground*2 Always 10 kΩ or higher
      for RHD, for 5-Passenger with Ottoman
      Tester Connection Condition Specified Condition
      f41-21 (MSW) - r11-4 (MSWR)*1 Always Below 1 Ω
      r11-14 (E) - Body ground*1 Always Below 1 Ω
      f41-21 (MSW) - Body ground*1 Always 10 kΩ or higher
      f38-21 (MSW) - r12-1 (VSML)*2 Always Below 1 Ω
      r12-4 (E3) - Body ground*2 Always Below 1 Ω
      f38-21 (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.

    NG

    REPLACE POSITION CONTROL ECU Click here

    OK

    END (SEAT VIBRATOR SWITCH IS DEFECTIVE)