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

DESCRIPTION

Signals are input into the front power seat switch LH (w/ Memory). The built-in ECU manages the signals received from the front power seat switch, and operates each motor. If the front power seat switch LH (w/ Memory) receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the front power seat switch LH (w/ Memory) receives 1 signal only.

WIRING DIAGRAM

A01ESXRE28
A01EXLEE20

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the power seat switch Click here.

      Result
      Result Proceed to
      One or more power seat functions (except lumbar support adjustment function) do not operate A
      All power seat functions do not operate B
      Front vertical and lifter functions do not operate C
      Only lumbar support adjustment function does not operate D

    B

    GO TO OTHER DIAGNOSIS PROCEDURE (Front Power Seat does not Operate with Front Power Seat Switch) Click here

    C

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH (W/ MEMORY) - BATTERY) Click here

    D

    INSPECT LUMBAR FRONT POWER SEAT SWITCH Click here

    A

  2. READ VALUE USING GTS (POWER SEAT SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

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

      Driver Seat (Front Power Seat Switch LH (w/ Memory))
      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 Slide switch signal (Rearward) / ON or OFF

      ON: Slide switch (Rearward) on

      OFF: Slide switch (Rearward) off

      		 -
      Slide Front Slide switch signal (Forward) / ON or OFF

      ON: Slide switch (Forward) on

      OFF: Slide switch (Forward) off

      		 -
      OK
      ON or OFF is displayed on the GTS according to the table above.

    NG

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here

    A

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


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

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

      Driver Seat (Front Power Seat Switch LH (w/ Memory))
      Tester Display Test Part Control Range Diagnostic Note
      Seat Reclining Seat reclining operation OFF/Rear/Front -
      Front Vertical Operation Seat front vertical operation OFF/Down/Up -
      Lifter Operation Seat lifter operation OFF/Down/Up -
      Seat Slide Operation Seat slide operation OFF/Rear/Front -
      Result
      Result Proceed to
      The power seat functions operate normally. A
      Slide, front vertical or lifter function does not operate normally. B
      Reclining function does not operate normally. C

    B

    INSPECT SEPARATE TYPE FRONT SEAT CUSHION ASSEMBLY Click here

    C

    INSPECT SEPARATE TYPE FRONT SEATBACK ASSEMBLY Click here

    A

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here

  4. INSPECT SEPARATE TYPE FRONT SEAT CUSHION ASSEMBLY


    1. A01EWJBE14
      Text in Illustration
      *a

      Component without harness connected

      (Slide Motor (Separate Type Front Seat Cushion Assembly))

      Disconnect the e8, e9 or e10 connector from each motor.

      Tech Tips

      Check the motor operation of applicable function.

    2. Check the operation of the slide motor.


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → Terminal 4

        Battery negative (-) → Terminal 1

        		 Seat cushion moves forward

        Battery positive (+) → Terminal 1

        Battery negative (-) → Terminal 4

        		 Seat cushion moves backward
    3. A01EWJBE14
      Text in Illustration
      *a

      Component without harness connected

      (Front Vertical Motor (Separate Type Front Seat Cushion Assembly))

      Check the operation of the front vertical motor.


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → Terminal 4

        Battery negative (-) → Terminal 1

        		 Seat cushion moves upward

        Battery positive (+) → Terminal 1

        Battery negative (-) → Terminal 4

        		 Seat cushion moves downward
    4. A01EWJBE14
      Text in Illustration
      *a

      Component without harness connected

      (Lifter Motor (Separate Type Front Seat Cushion Assembly))

      Check the operation of the lifter motor.


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → Terminal 4

        Battery negative (-) → Terminal 1

        		 Seat cushion moves upward

        Battery positive (+) → Terminal 1

        Battery negative (-) → Terminal 4

        		 Seat cushion moves downward
        Result
        Result Proceed to
        NG A
        OK B

    B

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH (W/ MEMORY) - POWER SEAT MOTOR) Click here

    A

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION ASSEMBLY Click here

  5. INSPECT SEPARATE TYPE FRONT SEATBACK ASSEMBLY


    1. A01EWJBE14
      Text in Illustration
      *a

      Component without harness connected

      (Reclining Motor (Separate Type Front Seatback Assembly))

      Disconnect g3 reclining motor connector.

    2. Check the operation of the reclining motor.


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → Terminal 4

        Battery negative (-) → Terminal 1

        		 Seatback moves forward

        Battery positive (+) → Terminal 1

        Battery negative (-) → Terminal 4

        		 Seatback moves backward

    NG

    REPLACE SEPARATE TYPE FRONT SEATBACK ASSEMBLY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH (W/ MEMORY) - POWER SEAT MOTOR)


    1. Disconnect the e11 front power seat switch LH (w/ Memory) connector.

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

      Tech Tips

      Check the wire harness and connector between the front power seat switch LH (w/ Memory) and applicable motor.

      Standard Resistance
      Tester Connection Condition Specified Condition
      e11-3 (SLD+) - e8-4 Always Below 1 Ω
      e11-4 (SLD-) - e8-1 Always Below 1 Ω
      e11-5 (FRV-) - e9-1 Always Below 1 Ω
      e11-8 (FRV+) - e9-4 Always Below 1 Ω
      e11-10 (LFT+) - e10-4 Always Below 1 Ω
      e11-12 (LFT-) - e10-1 Always Below 1 Ω
      e11-9 (RCL+) - g3-4 Always Below 1 Ω
      e11-11 (RCL-) - g3-1 Always Below 1 Ω
      e11-3 (SLD+) - Body ground Always 10 kΩ or higher
      e11-4 (SLD-) - Body ground Always 10 kΩ or higher
      e11-5 (FRV-) - Body ground Always 10 kΩ or higher
      e11-8 (FRV+) - Body ground Always 10 kΩ or higher
      e11-10 (LFT+) - Body ground Always 10 kΩ or higher
      e11-12 (LFT-) - Body ground Always 10 kΩ or higher
      e11-9 (RCL+) - Body ground Always 10 kΩ or higher
      e11-11 (RCL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here

  7. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH (W/ MEMORY) - BATTERY)


    1. Disconnect the e12 front power seat switch LH (w/ Memory) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      e12-12 (SYSB) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here

  8. INSPECT LUMBAR FRONT POWER SEAT SWITCH


    1. Remove the lumbar front power seat switch Click here.

    2. A01EYZ4E10
      Text in Illustration
      *1 Hold Switch
      *2 Release Switch
      *a

      Component without harness connected

      (Lumbar Front Power Seat Switch)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      3 - 5 Hold Below 1 Ω
      1 - 2
      2 - 3 Off
      2 - 1
      2 - 3 Release
      1 - 5

    NG

    REPLACE LUMBAR FRONT POWER SEAT SWITCH Click here

    OK

  9. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY (SEPARATE TYPE FRONT SEATBACK ASSEMBLY)


    1. A01EU55E22
      Text in Illustration
      *a

      Component without harness connected

      (Lumbar Support Adjuster Assembly (Separate Type Front Seatback Assembly))

      Disconnect g4 lumbar support adjuster assembly connector.

    2. Check the operation of the lumbar support adjuster assembly.


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

        OK
        Measurement Condition Operational Direction

        Battery positive (+) → Terminal 1

        Battery negative (-) → Terminal 2

        		 Seatback moves forward

        Battery positive (+) → Terminal 2

        Battery negative (-) → Terminal 1

        		 Seatback moves backward

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY (SEPARATE TYPE FRONT SEATBACK ASSEMBLY) Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH (W/ MEMORY) - LUMBAR FRONT POWER SEAT SWITCH - LUMBAR MOTOR)


    1. Disconnect the e11 front power seat switch LH (w/ Memory) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e11-6 (+B2) - e5-5 Always Below 1 Ω
      e11-1 (GND2) - e5-2 Always Below 1 Ω
      e5-3 - g4-1 Always Below 1 Ω
      e5-1 - g4-2 Always Below 1 Ω
      e5-5 - Body ground Always 10 kΩ or higher
      e5-2 - Body ground Always 10 kΩ or higher
      e5-3 - Body ground Always 10 kΩ or higher
      e5-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here