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 assembly. The built-in ECU manages the signals received from the position control ECU assembly and operates each motor. If the position control ECU assembly receives 2 or more operation signals for the same motor, the motor will be stopped. Manual operation resumes when the position control ECU assembly receives only 1 signal.

WIRING DIAGRAM


  1. B0088W5E02
    B00846RE01

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 do not operate A
      All power seat functions do not operate B

    B

    GO TO OTHER DIAGNOSIS PROCEDURE (Front Power Seat does not Operate with 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 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

      		 -
      Lumbar Switch Front Lumbar support adjuster switch signal (Forward) ON or OFF

      ON: Lumbar support adjuster switch (Forward) on

      OFF: Lumbar support adjuster switch (Forward) off

      		 -
      Lumbar Switch Rear Lumbar support adjuster switch signal (Rearward) ON or OFF

      ON: Lumbar support adjuster switch (Rearward) on

      OFF: Lumbar support adjuster switch (Rearward) 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
      Lumbar Switch Front
      Lumbar Switch Rear
      OK
      On the GTS screen, ON or OFF is displayed accordingly
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT 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 -
      Lumbar Slide Lumbar support 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

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Lumbar Slide
      Result
      Result Proceed to
      All power seat functions operate normally A
      Slide function does not operate normally B
      Front vertical function does not operate normally C
      Lifter function does not operate normally D
      Reclining function does not operate normally E
      Lumbar support adjustment function does not operate normally F

    A

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    C

    INSPECT POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT) Click here

    D

    INSPECT POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT) Click here

    E

    INSPECT RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT)) Click here

    F

    INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY (DRIVER SEAT) Click here

    B

  4. INSPECT SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT))


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

      Click here

    2. Inspect the slide motor (front seat adjuster assembly (driver seat)).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 9 Click here

    NG

    REPLACE SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT)) Click here

  5. INSPECT POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT)


    1. Remove the power seat tilt motor assembly (driver seat).

      Click here

    2. Inspect the power seat tilt motor assembly (driver seat).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 9 Click here

    NG

    REPLACE POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT) Click here

  6. INSPECT POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT)


    1. Remove the power seat lifter motor assembly (driver seat).

      Click here

    2. Inspect the power seat lifter motor assembly (driver seat).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 9 Click here

    NG

    REPLACE POWER SEAT LIFTER MOTOR ASSEMBLY (DRIVER SEAT) Click here

  7. INSPECT RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT))


    1. Remove the reclining motor (front seatback frame sub-assembly (driver seat)).

      Click here

    2. Inspect the reclining motor (front seatback frame sub-assembly (driver seat)).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 9 Click here

    NG

    REPLACE FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT) Click here

  8. 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

  9. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) - POWER SEAT MOTOR)


    1. Disconnect the b23*1 and b24*1 or a10*2 and a11*2 position control ECU assembly (driver seat) connectors.


      • *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 position control ECU assembly (driver seat) and applicable motor.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b23-1 (SLD+) - b19-4 Always Below 1 Ω
      b23-1 (SLD+) or b19-4 - Body ground Always 10 kΩ or higher
      b23-5 (SLD-) - b19-1 Always Below 1 Ω
      b23-5 (SLD-) or b19-1 - Body ground Always 10 kΩ or higher
      b23-7 (FRV+) - b20-1 Always Below 1 Ω
      b23-7 (FRV+) or b20-1 - Body ground Always 10 kΩ or higher
      b24-4 (FRV-) - b20-4 Always Below 1 Ω
      b24-4 (FRV-) or b20-4 - Body ground Always 10 kΩ or higher
      b23-6 (LFT+) - b21-1 Always Below 1 Ω
      b23-6 (LFT+) or b21-1 - Body ground Always 10 kΩ or higher
      b24-5 (LFT-) - b21-4 Always Below 1 Ω
      b24-5 (LFT-) or b21-4 - Body ground Always 10 kΩ or higher
      b23-10 (RCL+) - c1-1 Always Below 1 Ω
      b23-10 (RCL+) or c1-1 - Body ground Always 10 kΩ or higher
      b24-6 (RCL-) - c1-4 Always Below 1 Ω
      b24-6 (RCL-) or c1-4 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a10-1 (SLD+) - a5-4 Always Below 1 Ω
      a10-1 (SLD+) or a5-4 - Body ground Always 10 kΩ or higher
      a10-5 (SLD-) - a5-1 Always Below 1 Ω
      a10-5 (SLD-) or a5-1 - Body ground Always 10 kΩ or higher
      a10-7 (FRV+) - a6-1 Always Below 1 Ω
      a10-7 (FRV+) or a6-1 - Body ground Always 10 kΩ or higher
      a11-4 (FRV-) - a6-4 Always Below 1 Ω
      a11-4 (FRV-) or a6-4 - Body ground Always 10 kΩ or higher
      a10-6 (LFT+) - a7-1 Always Below 1 Ω
      a10-6 (LFT+) or a7-1 - Body ground Always 10 kΩ or higher
      a11-5 (LFT-) - a7-4 Always Below 1 Ω
      a11-5 (LFT-) or a7-4 - Body ground Always 10 kΩ or higher
      a10-10 (RCL+) - o1-1 Always Below 1 Ω
      a10-10 (RCL+) or o1-1 - Body ground Always 10 kΩ or higher
      a11-6 (RCL-) - o1-4 Always Below 1 Ω
      a11-6 (RCL-) or o1-4 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. INSPECT FRONT POWER SEAT SWITCH (DRIVER SEAT)


    1. Remove the front power seat switch (driver seat).

      Click here

    2. Inspect the front power seat switch (driver seat).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT POWER SEAT SWITCH (DRIVER SEAT) Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) - FRONT POWER SEAT SWITCH (DRIVER SEAT))


    1. Disconnect the b25*1 or a12*2 position control ECU assembly (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
      b22-6 (SLDR) - b25-23 (SLDR) Always Below 1 Ω
      b22-6 (SLDR) or b25-23 (SLDR) - Body ground Always 10 kΩ or higher
      b22-7 (SLDF) - b25-9 (SLDF) Always Below 1 Ω
      b22-7 (SLDF) or b25-9 (SLDF) - Body ground Always 10 kΩ or higher
      b22-1 (RCLR) - b25-22 (RCLR) Always Below 1 Ω
      b22-1 (RCLR) or b25-22 (RCLR) - Body ground Always 10 kΩ or higher
      b22-2 (RCLF) - b25-8 (RCLF) Always Below 1 Ω
      b22-2 (RCLF) or b25-8 (RCLF) - Body ground Always 10 kΩ or higher
      b22-4 (FUP) - b25-6 (FRVU) Always Below 1 Ω
      b22-4 (FUP) or b25-6 (FRVU) - Body ground Always 10 kΩ or higher
      b22-5 (FDWN) - b25-20 (FRVD) Always Below 1 Ω
      b22-5 (FDWN) or b25-20 (FRVD) - Body ground Always 10 kΩ or higher
      b22-3 (LUP) - b25-7 (LFTU) Always Below 1 Ω
      b22-3 (LUP) or b25-7 (LFTU) - Body ground Always 10 kΩ or higher
      b22-8 (LDWN) - b25-21 (LFTD) Always Below 1 Ω
      b22-8 (LDWN) or b25-21 (LFTD) - Body ground Always 10 kΩ or higher
      b22-14 (H) - b25-4 (LFLF) Always Below 1 Ω
      b22-14 (H) or b25-4 (LFLF) - Body ground Always 10 kΩ or higher
      b22-17 (R) - b25-18 (LFLR) Always Below 1 Ω
      b22-17 (R) or b25-18 (LFLR) - Body ground Always 10 kΩ or higher
      b22-20 (E) - b25-12 (SENG) Always Below 1 Ω
      b22-20 (E) or b25-12 (SENG) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a8-5 (SLDR) - a12-23 (SLDR) Always Below 1 Ω
      a8-5 (SLDR) or a12-23 (SLDR) - Body ground Always 10 kΩ or higher
      a8-4 (SLDF) - a12-9 (SLDF) Always Below 1 Ω
      a8-4 (SLDF) or a12-9 (SLDF) - Body ground Always 10 kΩ or higher
      a8-10 (RCLR) - a12-22 (RCLR) Always Below 1 Ω
      a8-10 (RCLR) or a12-22 (RCLR) - Body ground Always 10 kΩ or higher
      a8-9 (RCLF) - a12-8 (RCLF) Always Below 1 Ω
      a8-9 (RCLF) or a12-8 (RCLF) - Body ground Always 10 kΩ or higher
      a8-7 (FUP) - a12-6 (FRVU) Always Below 1 Ω
      a8-7 (FUP) or a12-6 (FRVU) - Body ground Always 10 kΩ or higher
      a8-6 (FDWN) - a12-20 (FRVD) Always Below 1 Ω
      a8-6 (FDWN) or a12-20 (FRVD) - Body ground Always 10 kΩ or higher
      a8-8 (LUP) - a12-7 (LFTU) Always Below 1 Ω
      a8-8 (LUP) or a12-7 (LFTU) - Body ground Always 10 kΩ or higher
      a8-3 (LDWN) - a12-21 (LFTD) Always Below 1 Ω
      a8-3 (LDWN) or a12-21 (LFTD) - Body ground Always 10 kΩ or higher
      a8-17 (H) - a12-4 (LFLF) Always Below 1 Ω
      a8-17 (H) or a12-4 (LFLF) - Body ground Always 10 kΩ or higher
      a8-14 (R) - a12-18 (LFLR) Always Below 1 Ω
      a8-14 (R) or a12-18 (LFLR) - Body ground Always 10 kΩ or higher
      a8-11 (E) - a12-12 (SENG) Always Below 1 Ω
      a8-11 (E) or a12-12 (SENG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR