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 LH*1, RH*2 is operated, a command signal is sent to the built-in ECU. The built-in ECU then controls the appropriate seat motor as needed. The built-in ECU is designed so that a malfunction of the seat memory system will not interfere with manual seat control.

WIRING DIAGRAM

B001YIGE01
B001YIGE02

CAUTION / NOTICE / HINT

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 front power seat switches Click here.

      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 POWER SEAT SWITCH ASSEMBLY Click here

    A

  2. READ VALUE USING GTS (FRONT POWER SEAT SWITCH)


    1. Using the GTS, read the Data List.

      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 the GTS screen, each item changes between ON and OFF according to above chart.

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

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


    1. Using the GTS, perform the Active Test.

      Driver Seat
      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 sliding operation OFF/Rear/Front -
      OK
      The power seat motors operate normally.

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

    NG

  4. INSPECT FRONT SEAT WITH ADJUSTER FRAME ASSEMBLY (FRONT POWER SEAT MOTOR)


    1. Remove the front seat with adjuster frame assembly LH*1, RH*2 Click here.

      *1: for LHD

      *2: for RHD

    2. B001WLVE01
      *1 Component without harness connected: (Slide Motor)

      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 (+) → 1

        Battery negative (-) → 2

        		 Forward

        Battery positive (+) → 2

        Battery negative (-) → 1

        		 Rearward
    3. B001WLVE03
      *1 Component without harness connected: (Front Vertical Motor)

      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
    4. B001WLVE04
      *1 Component without harness connected: (Lifter Motor)

      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 (+) → 2

        Battery negative (-) → 1

        		 Upward

        Battery positive (+) → 1

        Battery negative (-) → 2

        		 Downward
    5. B001WLVE05
      *1 Component without harness connected: (Reclining Motor)

      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 Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR)

    *1: for LHD

    *2: for RHD


    1. Disconnect the c39*1, c46*2 switch connector.

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

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

      Standard Resistance
      for LHD:
      Tester Connection Condition Specified Condition
      c39-4 (SLD-) - c17-2 Always Below 1 Ω
      c39-2 (SLD+) - c17-1 Always Below 1 Ω
      c39-5 (FRV-) - c19-2 Always Below 1 Ω
      c39-7 (FRV+) - c19-1 Always Below 1 Ω
      c39-11 (LFT-) - c18-1 Always Below 1 Ω
      c39-8 (LFT+) - c18-2 Always Below 1 Ω
      c39-12 (RCL-) - c20-1 Always Below 1 Ω
      c39-9 (RCL+) - c20-2 Always Below 1 Ω
      c39-1 (GND) - Body ground Always Below 1 Ω
      c39-4 (SLD-) or c17-2 - Body ground Always 10 kΩ or higher
      c39-2 (SLD+) or c17-1 - Body ground Always 10 kΩ or higher
      c39-5 (FRV-) or c19-2 - Body ground Always 10 kΩ or higher
      c39-7 (FRV+) or c19-1 - Body ground Always 10 kΩ or higher
      c39-11 (LFT-) or c18-1 - Body ground Always 10 kΩ or higher
      c39-8 (LFT+) or c18-2 - Body ground Always 10 kΩ or higher
      c39-12 (RCL-) or c20-1 - Body ground Always 10 kΩ or higher
      c39-9 (RCL+) or c20-2 - Body ground Always 10 kΩ or higher
      for RHD:
      Tester Connection Condition Specified Condition
      c46-4 (SLDR) - c3-2 Always Below 1 Ω
      c46-2 (SLDF) - c3-1 Always Below 1 Ω
      c46-5 (FDWN) - c5-2 Always Below 1 Ω
      c46-7 (FUP) - c5-1 Always Below 1 Ω
      c46-11 (LDWN) - c4-1 Always Below 1 Ω
      c46-8 (LUP) - c4-2 Always Below 1 Ω
      c46-12 (RCLR) - c6-1 Always Below 1 Ω
      c46-9 (RCLF) - c6-2 Always Below 1 Ω
      c46-1 (GND) - Body ground Always Below 1 Ω
      c46-4 (SLDR) or c3-2 - Body ground Always 10 kΩ or higher
      c46-2 (SLDF) or c3-1 - Body ground Always 10 kΩ or higher
      c46-5 (FDWN) or c5-2 - Body ground Always 10 kΩ or higher
      c46-7 (FUP) or c5-1 - Body ground Always 10 kΩ or higher
      c46-11 (LDWN) or c4-1 - Body ground Always 10 kΩ or higher
      c46-8 (LUP) or c4-2 - Body ground Always 10 kΩ or higher
      c46-12 (RCLR) or c6-1 - Body ground Always 10 kΩ or higher
      c46-9 (RCLF) or c6-2 - Body ground Always 10 kΩ or higher

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT POWER SEAT SWITCH ASSEMBLY

    *1: for LHD

    *2: for RHD


    1. Remove the power seat switch assembly LH*1, RH*2 Click here.

    2. Inspect the power seat switch assembly LH*1, RH*2 Click here.


    NG

    REPLACE POWER SEAT SWITCH ASSEMBLY Click here

    OK

  7. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY

    *1: for LHD

    *2: for RHD


    1. Remove the lumbar support adjuster assembly LH*1, RH*2 Click here.

    2. Inspect the lumbar support adjuster assembly LH*1, RH*2 Click here.


    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (POWER SEAT SWITCH ASSEMBLY - BATTERY AND BODY GROUND)


    1. B001X75E02

      Disconnect the c16*1, c26*2 switch connector.

      *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
      c26-3 (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
      c26-5 (E2) - Body ground Always Below 1 Ω
      c26-2 (E2) - Body ground

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR