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

WIRING DIAGRAM

A011M1TE04
A011NZ1E04

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following 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 switch (driver seat).

      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 (DRIVER SEAT) - AUXILIARY BATTERY) Click here

    D

    INSPECT FRONT LUMBAR POWER SEAT SWITCH Click here

    A

  2. READ VALUE USING GTS (POWER SEAT SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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.


      Body Electrical > Driver Seat > Data List
      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

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Reclining Rear
      Reclining Front
      Front Vertical Down
      Front Vertical Up
      Lifter Switch Down
      Lifter Switch Up
      Slide Rear
      Slide Front
      OK
      ON or OFF is displayed on the GTS according to the table above.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT POWER SEAT SWITCH (DRIVER SEAT) Click here

    OK

  3. 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.


      Body Electrical > Driver Seat > Active Test
      Tester Display Measurement Item 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 -

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Seat Reclining

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Front Vertical Operation

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Lifter Operation

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Seat Slide Operation
      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

    A

    REPLACE FRONT POWER SEAT SWITCH (DRIVER SEAT) Click here

    C

    INSPECT SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT) Click here

    B

  4. INSPECT FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT)

    Tech Tips

    Check the motor operation of applicable function.


    1. Remove the front seat adjuster assembly (driver seat).

      Click here

    2. Inspect the front seat adjuster assembly (driver seat) (slide motor, front vertical motor or lifter motor).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 6 Click here

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT) Click here

  5. INSPECT SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT)


    1. Remove the separate type front seatback spring assembly (driver seat).

      Click here

    2. Inspect the separate type front seatback spring assembly (driver seat) (reclining motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT) Click here

    OK

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


    1. Disconnect the b4*1 or a6*2 front power seat switch (driver seat) connector.


      • *1: for LHD

      • *2: for RHD

    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 (driver seat) and applicable motor.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b4-3 (SLD+) - b9-4 (FWD) Always Below 1 Ω
      b4-3 (SLD+) - Body ground Always 10 kΩ or higher
      b9-4 (FWD) - Body ground Always 10 kΩ or higher
      b4-4 (SLD-) - b9-1 (BACK) Always Below 1 Ω
      b4-4 (SLD-) - Body ground Always 10 kΩ or higher
      b9-1 (BACK) - Body ground Always 10 kΩ or higher
      b4-5 (FRV-) - b2-1 Always Below 1 Ω
      b4-5 (FRV-) - Body ground Always 10 kΩ or higher
      b2-1 - Body ground Always 10 kΩ or higher
      b4-8 (FRV+) - b2-2 Always Below 1 Ω
      b4-8 (FRV+) - Body ground Always 10 kΩ or higher
      b2-2 - Body ground Always 10 kΩ or higher
      b4-10 (LFT+) - b3-2 Always Below 1 Ω
      b4-10 (LFT+) - Body ground Always 10 kΩ or higher
      b3-2 - Body ground Always 10 kΩ or higher
      b4-12 (LFT-) - b3-1 Always Below 1 Ω
      b4-12 (LFT-) - Body ground Always 10 kΩ or higher
      b3-1 - Body ground Always 10 kΩ or higher
      b4-9 (RCL+) - d2-2 Always Below 1 Ω
      b4-9 (RCL+) - Body ground Always 10 kΩ or higher
      d2-2 - Body ground Always 10 kΩ or higher
      b4-11 (RCL-) - d2-1 Always Below 1 Ω
      b4-11 (RCL-) - Body ground Always 10 kΩ or higher
      d2-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a6-3 (SLD+) - a1-4 (FWD) Always Below 1 Ω
      a6-3 (SLD+) - Body ground Always 10 kΩ or higher
      a1-4 (FWD) - Body ground Always 10 kΩ or higher
      a6-4 (SLD-) - a1-1 (BACK) Always Below 1 Ω
      a6-4 (SLD-) - Body ground Always 10 kΩ or higher
      a1-1 (BACK) - Body ground Always 10 kΩ or higher
      a6-5 (FRV-) - a3-1 Always Below 1 Ω
      a6-5 (FRV-) - Body ground Always 10 kΩ or higher
      a3-1 - Body ground Always 10 kΩ or higher
      a6-8 (FRV+) - a3-2 Always Below 1 Ω
      a6-8 (FRV+) - Body ground Always 10 kΩ or higher
      a3-2 - Body ground Always 10 kΩ or higher
      a6-10 (LFT+) - a4-2 Always Below 1 Ω
      a6-10 (LFT+) - Body ground Always 10 kΩ or higher
      a4-2 - Body ground Always 10 kΩ or higher
      a6-12 (LFT-) - a4-1 Always Below 1 Ω
      a6-12 (LFT-) - Body ground Always 10 kΩ or higher
      a4-1 - Body ground Always 10 kΩ or higher
      a6-9 (RCL+) - c2-2 Always Below 1 Ω
      a6-9 (RCL+) - Body ground Always 10 kΩ or higher
      c2-2 - Body ground Always 10 kΩ or higher
      a6-11 (RCL-) - c2-1 Always Below 1 Ω
      a6-11 (RCL-) - Body ground Always 10 kΩ or higher
      c2-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH (DRIVER SEAT) - AUXILIARY BATTERY)


    1. Disconnect the b12*1 or a7*2 front power seat switch (driver seat) 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
      b12-12 (SYSB) - Body ground Power switch off 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      a7-12 (SYSB) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  8. INSPECT FRONT LUMBAR POWER SEAT SWITCH


    1. Remove the front lumbar power seat switch.

      Click here

    2. Inspect the front lumbar power seat switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT LUMBAR POWER SEAT SWITCH Click here

    OK

  9. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY (DRIVER SEAT)


    1. Remove the lumbar support adjuster assembly (driver seat).

      Click here

    2. Inspect the lumbar support adjuster assembly (driver seat).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY (DRIVER SEAT) Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH (DRIVER SEAT) - FRONT LUMBAR POWER SEAT SWITCH)


    1. Disconnect the b4*1 or a6*2 front power seat switch (driver seat) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b4-6 (+B2) - b10-5 (B) Always Below 1 Ω
      b4-6 (+B2) - Body ground Always 10 kΩ or higher
      b10-5 (B) - Body ground Always 10 kΩ or higher
      b4-1 (GND2) - b10-2 (E2) Always Below 1 Ω
      b4-1 (GND2) - Body ground Always 10 kΩ or higher
      b10-2 (E2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a6-6 (+B2) - a8-5 (B) Always Below 1 Ω
      a6-6 (+B2) - Body ground Always 10 kΩ or higher
      a8-5 (B) - Body ground Always 10 kΩ or higher
      a6-1 (GND2) - a8-2 (E2) Always Below 1 Ω
      a6-1 (GND2) - Body ground Always 10 kΩ or higher
      a8-2 (E2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (FRONT LUMBAR POWER SEAT SWITCH - LUMBAR SUPPORT ADJUSTER ASSEMBLY (DRIVER SEAT))


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b10-1 (R) - d3-2 Always Below 1 Ω
      b10-1 (R) - Body ground Always 10 kΩ or higher
      d3-2 - Body ground Always 10 kΩ or higher
      b10-3 (H) - d3-1 Always Below 1 Ω
      b10-3 (H) - Body ground Always 10 kΩ or higher
      d3-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a8-1 (H) - c3-1 Always Below 1 Ω
      a8-1 (H) - Body ground Always 10 kΩ or higher
      c3-1 - Body ground Always 10 kΩ or higher
      a8-3 (R) - c3-2 Always Below 1 Ω
      a8-3 (R) - Body ground Always 10 kΩ or higher
      c3-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR