FRONT POWER SEAT CONTROL SYSTEM (for Driver Side) One or more Power Seat Motors do not Operate

DESCRIPTION

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

Tech Tips

The position control ECU and seat adjustment switches are built into an assembly that is referred to as the position control ECU and switch assembly.

WIRING DIAGRAM

A01CE9DE04
A01CE9DE05

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (POSITION CONTROL ECU AND SWITCH ASSEMBLY)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

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

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

      D-Seat
      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

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

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


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

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

      D-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 -
      Result
      Result Proceed to
      OK A
      NG (for RHD) B
      NG (for LHD) C
      OK
      The power seat motors operate normally.

    B

    INSPECT FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH Click here

    C

    INSPECT FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH Click here

    A

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

  3. INSPECT FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH


    1. A01CEVIE37

      Remove the front seat frame with adjuster assembly RH Click here.

    2. Disconnect the V14, V2, V3 and V4 connectors from each motor.

    3. 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
        Measurement Condition Specified Condition

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Forward

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Rearward
    4. A01CD2UE08

      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
        Measurement Condition Specified Condition

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Upward

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Downward
    5. A01CD2UE10

      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
        Measurement Condition Specified Condition

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Forward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Rearward
    6. A01CD2UE11

      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

    NG

    REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH Click here

    OK

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


    1. Disconnect the V15 connector from the position control ECU and switch assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V15-2 (SLD+) - V14-3 Always Below 1 Ω
      V15-4 (SLD-) - V14-4 Always Below 1 Ω
      V15-5 (FRV-) - V3-1 Always Below 1 Ω
      V15-7 (FRV+) - V3-2 Always Below 1 Ω
      V15-8 (LFT+) - V2-1 Always Below 1 Ω
      V15-9 (RCL+) - V4-2 Always Below 1 Ω
      V15-11 (LFT-) - V2-2 Always Below 1 Ω
      V15-12 (RCL-) - V4-1 Always Below 1 Ω
      V15-2 (SLD+) - Body ground Always 10 kΩ or higher
      V15-4 (SLD-) - Body ground Always 10 kΩ or higher
      V15-5 (FRV-) - Body ground Always 10 kΩ or higher
      V15-7 (FRV+) - Body ground Always 10 kΩ or higher
      V15-8 (LFT+) - Body ground Always 10 kΩ or higher
      V15-9 (RCL+) - Body ground Always 10 kΩ or higher
      V15-11 (LFT-) - Body ground Always 10 kΩ or higher
      V15-12 (RCL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

  5. INSPECT FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH


    1. A01CEVIE38

      Remove the front seat frame with adjuster assembly LH Click here.

    2. Disconnect the W15, W7, W8 and W9 connectors from each motor.

    3. 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
        Measurement Condition Specified Condition

        Battery positive (+) → 3

        Battery negative (-) → 4

        		 Forward

        Battery positive (+) → 4

        Battery negative (-) → 3

        		 Rearward
    4. A01CD2UE86

      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
        Measurement Condition Specified Condition

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Upward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Downward
    5. A01CD2UE87

      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
        Measurement Condition Specified Condition

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Forward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Rearward
    6. A01CD2UE88

      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

    NG

    REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH Click here

    OK

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


    1. Disconnect the W16 connector from the position control ECU and switch assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      W16-2 (SLD+) - W15-3 Always Below 1 Ω
      W16-4 (SLD-) - W15-4 Always Below 1 Ω
      W16-5 (FRV-) - W8-2 Always Below 1 Ω
      W16-7 (FRV+) - W8-1 Always Below 1 Ω
      W16-8 (LFT+) - W7-2 Always Below 1 Ω
      W16-9 (RCL+) - W9-2 Always Below 1 Ω
      W16-11 (LFT-) - W7-1 Always Below 1 Ω
      W16-12 (RCL-) - W9-1 Always Below 1 Ω
      W16-2 (SLD+) - Body ground Always 10 kΩ or higher
      W16-4 (SLD-) - Body ground Always 10 kΩ or higher
      W16-5 (FRV-) - Body ground Always 10 kΩ or higher
      W16-7 (FRV+) - Body ground Always 10 kΩ or higher
      W16-8 (LFT+) - Body ground Always 10 kΩ or higher
      W16-9 (RCL+) - Body ground Always 10 kΩ or higher
      W16-11 (LFT-) - Body ground Always 10 kΩ or higher
      W16-12 (RCL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

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


    1. Disconnect the V16*1, W17*2 connector from the position control ECU and switch assembly.


      • *1: for RHD

      • *2: for LHD

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

      Standard Voltage
      for RHD
      Tester Connection Condition Specified Condition
      V16-12 (SYSB) - Body ground Always 11 to 14 V
      for LHD
      Tester Connection Condition Specified Condition
      W17-12 (SYSB) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY)

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here