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

DESCRIPTION

When the front power seat switch is operated, a command signal is sent to the position control ECU. The position control ECU then controls the appropriate seat motor as needed. The position control ECU is designed so that a malfunction of the seat memory system will not interfere with manual seat control.

WIRING DIAGRAM

A0155EBE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the front power seat switches.

      Result
      Result Proceed to
      All front power seat switch operations are malfunctioning except lumbar support switch operation A
      Only lumbar support switch operation is malfunctioning B

    B

    INSPECT LUMBAR SUPPORT SWITCH Click here

    A

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


    1. Using the intelligent tester, read the Data List.

      Driver Seat
      Item Measurement Item/Display (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 intelligent tester screen, each item changes between ON and OFF according to above chart.

    NG

    REPLACE POSITION CONTROL ECU AND SWITCH Click here

    OK

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


    1. Using the intelligent tester, perform the Active Test.

      Driver Seat
      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 -
      OK
      The power seat motors operate normally.

    NG

    INSPECT FRONT SEAT ASSEMBLY (FRONT POWER SEAT MOTOR) Click here

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH Click here

  4. INSPECT FRONT SEAT ASSEMBLY (FRONT POWER SEAT MOTOR)


    1. Remove the front seat assembly LH (for LHD) Click here.

    2. Remove the front seat assembly RH (for RHD) Click here.

    3. A015BTNE01

      Check operation of the slide motor.


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

        OK
        for LHD
        Measurement Condition Specified Condition

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Forward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Rearward
        for RHD
        Measurement Condition Specified Condition

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Forward

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Rearward
    4. A015BTNE03

      Check operation of the front vertical motor.


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

        OK
        for LHD
        Measurement Condition Specified Condition

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Upward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Downward
        for RHD
        Measurement Condition Specified Condition

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Upward

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Downward
    5. A015BTNE04

      Check operation of the lifter motor.


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

        OK
        for LHD
        Measurement Condition Specified Condition

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Upward

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Downward
        for RHD
        Measurement Condition Specified Condition

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Upward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Downward
    6. A015BTNE05

      Check operation of the reclining motor.


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

        OK
        Measurement Condition Specified Condition

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Forward

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Rearward
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE FRONT SEAT ASSEMBLY LH Click here

    C

    REPLACE FRONT SEAT ASSEMBLY RH

    A

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

    A015C1KE04

    1. Disconnect the c14*1 or c26*2 switch connector.

    2. Disconnect the c17*1, c18*1, c19*1, c20*1 or c3*2, c4*2, c5*2, c6*2 motor connectors.

      Tech Tips

      *1: for LHD

      *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      c14-3 (SLD-) - c17-2 Always Below 1 Ω
      c14-2 (SLD+) - c17-1 Always Below 1 Ω
      c14-4 (FRV-) - c19-2 Always Below 1 Ω
      c14-6 (FRV+) - c19-1 Always Below 1 Ω
      c14-9 (LFT-) - c18-1 Always Below 1 Ω
      c14-7 (LFT+) - c18-2 Always Below 1 Ω
      c14-10 (RCL-) - c20-1 Always Below 1 Ω
      c14-8 (RCL+) - c20-2 Always Below 1 Ω
      c14-1 (GND) - Body ground Always Below 1 Ω
      c14-3 (SLD-) or c17-2 - Body ground Always 10 kΩ or higher
      c14-2 (SLD+) or c17-1 - Body ground Always 10 kΩ or higher
      c14-4 (FRV-) or c19-2 - Body ground Always 10 kΩ or higher
      c14-6 (FRV+) or c19-1 - Body ground Always 10 kΩ or higher
      c14-9 (LFT-) or c18-1 - Body ground Always 10 kΩ or higher
      c14-7 (LFT+) or c18-2 - Body ground Always 10 kΩ or higher
      c14-10 (RCL-) or c20-1 - Body ground Always 10 kΩ or higher
      c14-8 (RCL+) or c20-2 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      c26-3 (SLD-) - c3-1 Always Below 1 Ω
      c26-2 (SLD+) - c3-2 Always Below 1 Ω
      c26-4 (FRV-) - c5-1 Always Below 1 Ω
      c26-6 (FRV+) - c5-2 Always Below 1 Ω
      c26-9 (LFT-) - c4-2 Always Below 1 Ω
      c26-7 (LFT+) - c4-1 Always Below 1 Ω
      c26-10 (RCL-) - c6-1 Always Below 1 Ω
      c26-8 (RCL+) - c6-2 Always Below 1 Ω
      c26-1 (GND) - Body ground Always Below 1 Ω
      c26-3 (SLD-) or c3-1 - Body ground Always 10 kΩ or higher
      c26-2 (SLD+) or c3-2 - Body ground Always 10 kΩ or higher
      c26-4 (FRV-) or c5-1 - Body ground Always 10 kΩ or higher
      c26-6 (FRV+) or c5-2 - Body ground Always 10 kΩ or higher
      c26-9 (LFT-) or c4-2 - Body ground Always 10 kΩ or higher
      c26-7 (LFT+) or c4-1 - Body ground Always 10 kΩ or higher
      c26-10 (RCL-) or c6-1 - Body ground Always 10 kΩ or higher
      c26-8 (RCL+) or c6-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH Click here

  6. INSPECT LUMBAR SUPPORT SWITCH

    A0157VSE01

    1. Remove the lumbar support switch Click here.

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      3 (B) - 4 (H) Hold Below 1 Ω
      1 (R) - 2 (E2)
      4 (H) - 5 (E2) Off
      1 (R) - 2 (E2)
      4 (H) - 5 (E2) Release
      1 (R) - 3 (B)
      for RHD
      Tester Connection Switch Condition Specified Condition
      3 (B) - 4 (H) Hold Below 1 Ω
      1 (R) - 2 (E)
      4 (H) - 5 (E) Off
      1 (R) - 2 (E)
      4 (H) - 5 (E) Release
      1 (R) - 3 (B)

    NG

    REPLACE LUMBAR SUPPORT SWITCH Click here

    OK

  7. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY

    A0157P7E06

    1. Remove the lumbar support adjuster Click here.

    2. Check operation of the lumbar support adjuster.


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

        OK
        for LHD
        Measurement Condition Specified Condition

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Clockwise

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Counterclockwise
        for RHD
        Measurement Condition Specified Condition

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Clockwise

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Counterclockwise

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (LUMBAR SUPPORT SWITCH - BATTERY AND BODY GROUND)

    A015AKBE02

    1. Disconnect the c16*1 or c28*2 switch connector.

      Tech Tips

      *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
      c16-3 (B) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      c28-3 (B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      c16-5 (E2) - Body ground Always Below 1 Ω
      c16-2 (E2) - Body ground
      for RHD
      Tester Connection Condition Specified Condition
      c28-5 (E) - Body ground Always Below 1 Ω
      c28-2 (E) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (LUMBAR SUPPORT SWITCH - LUMBAR SUPPORT ADJUSTER ASSEMBLY)