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

DESCRIPTION

Signals are input into the position control ECU and switch assembly. The built-in ECU manages the signals received from the position control ECU and switch assembly, 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

A01EKW7E04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING GTS (POWER SEAT SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.

      Driver 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 GTS according to the table above.

    NG

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

    OK

  2. PERFORM ACTIVE TEST USING GTS (POWER SEAT MOTOR)


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

    2. Perform the Active Test according to the display on the GTS.

      Driver Seat
      Tester Display Test Part Control Range Diagnostic Note
      Seat Reclining Seat reclining operation OFF/Front/Rear -
      Front Vertical Operation Seat front vertical operation OFF/Up/Down -
      Lifter Operation Seat lifter operation OFF/Up/Down -
      Seat Slide Operation Seat sliding operation OFF/Front/Rear -
      OK
      The power seat motors operate normally.

    NG

    INSPECT FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH Click here

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

  3. INSPECT FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH


    1. A01EJY0E43
      Text in Illustration
      *a

      Component without harness connected

      (Slide Motor (Front Seat Frame with Adjuster Assembly LH))

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

    2. 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
        Condition Specified Condition

        Battery positive (+) → Terminal 3

        Battery negative (-) → Terminal 4

        		 Forward

        Battery positive (+) → Terminal 4

        Battery negative (-) → Terminal 3

        		 Rearward
    3. A01ELRSE39
      Text in Illustration
      *a

      Component without harness connected

      (Front Vertical Motor (Front Seat Frame with Adjuster Assembly LH))

      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
        Condition Specified Condition

        Battery positive (+) → Terminal 1

        Battery negative (-) → Terminal 2

        		 Upward

        Battery positive (+) → Terminal 2

        Battery negative (-) → Terminal 1

        		 Downward
    4. A01ELRSE39
      Text in Illustration
      *a

      Component without harness connected

      (Lifter Motor (Front Seat Frame with Adjuster Assembly LH))

      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
        Condition Specified Condition

        Battery positive (+) → Terminal 2

        Battery negative (-) → Terminal 1

        		 Upward

        Battery positive (+) → Terminal 1

        Battery negative (-) → Terminal 2

        		 Downward
    5. A01ELRSE39
      Text in Illustration
      *a

      Component without harness connected

      (Reclining Motor (Front Seat Frame with Adjuster Assembly LH))

      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
        Condition Specified Condition

        Battery positive (+) → Terminal 2

        Battery negative (-) → Terminal 1

        		 Forward

        Battery positive (+) → Terminal 1

        Battery negative (-) → Terminal 2

        		 Rearward

    NG

    REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH Click here

    OK

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


    1. Disconnect the T10 position control ECU and switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T10-2 (SLD+) - T12-3 (FWD) Always Below 1 Ω
      T10-4 (SLD-) - T12-4 (BACK) Always Below 1 Ω
      T10-5 (FRV-) - T2-2 Always Below 1 Ω
      T10-7 (FRV+) - T2-1 Always Below 1 Ω
      T10-8 (LFT+) - T3-2 Always Below 1 Ω
      T10-11 (LFT-) - T3-1 Always Below 1 Ω
      T10-9 (RCL+) - T4-2 Always Below 1 Ω
      T10-12 (RCL-) - T4-1 Always Below 1 Ω
      T10-2 (SLD+) - Body ground Always 10 kΩ or higher
      T10-4 (SLD-) - Body ground Always 10 kΩ or higher
      T10-5 (FRV-) - Body ground Always 10 kΩ or higher
      T10-7 (FRV+) - Body ground Always 10 kΩ or higher
      T10-8 (LFT+) - Body ground Always 10 kΩ or higher
      T10-11 (LFT-) - Body ground Always 10 kΩ or higher
      T10-9 (RCL+) - Body ground Always 10 kΩ or higher
      T10-12 (RCL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (BATTERY - POSITION CONTROL ECU AND SWITCH ASSEMBLY - BODY GROUND)


    1. Disconnect the T11 position control ECU and switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      T11-12 (SYSB) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      T10-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here