FRONT POWER SEAT CONTROL SYSTEM One or more Power Seat Motors do not Operate

DESCRIPTION

Signals are input into the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat). The built-in ECU manages the signals received from the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat), and operates each motor. If the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat) receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat) receives 1 signal only.

WIRING DIAGRAM


  1. for Driver Seat

    B0074QPE05
    B0073ELE06
    *a Lumbar Support Adjuster Assembly LH
    *b Position Control ECU and Switch Assembly LH
    *c Front Lumbar Power Seat Switch

  2. for Front Passenger Seat

    B0073JJE03

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 position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat).

      Click here

      Result
      Result Proceed to
      Driver power seat functions do not operate A
      Front passenger power seat functions do not operate B

    B

    CHECK FRONT POWER SEAT OPERATION Click here

    A

  2. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the position control ECU and switch assembly (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 DIAGNOSTIC PROCEDURE (Front Power Seat does not Operate with Front Power Seat Switch) Click here

    C

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) - BATTERY) Click here

    D

    INSPECT FRONT LUMBAR POWER SEAT SWITCH Click here

    A

  3. 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

      		 -

      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 POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    OK

  4. 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 POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    C

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

    B

  5. 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 7 Click here

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (DRIVER SEAT) Click here

  6. INSPECT FRONT SEATBACK FRAME SUB-ASSEMBLY (DRIVER SEAT)


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

      Click here

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

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


    1. Disconnect the b4*1 or a4*2 position control ECU and switch assembly (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 position control ECU and switch assembly (driver seat) and applicable motor.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b4-3 (SLD+) - b1-4 (FWD) Always Below 1 Ω
      b4-3 (SLD+) or b1-4 (FWD) - Body ground Always 10 kΩ or higher
      b4-4 (SLD-) - b1-1 (BACK) Always Below 1 Ω
      b4-4 (SLD-) or b1-1 (BACK) - Body ground Always 10 kΩ or higher
      b4-5 (FRV-) - b3-1 Always Below 1 Ω
      b4-5 (FRV-) or b3-1 - Body ground Always 10 kΩ or higher
      b4-8 (FRV+) - b3-2 Always Below 1 Ω
      b4-8 (FRV+) or b3-2 - Body ground Always 10 kΩ or higher
      b4-10 (LFT+) - b2-4 Always Below 1 Ω
      b4-10 (LFT+) or b2-4 - Body ground Always 10 kΩ or higher
      b4-12 (LFT-) - b2-1 Always Below 1 Ω
      b4-12 (LFT-) or b2-1 - Body ground Always 10 kΩ or higher
      b4-9 (RCL+) - d2-2 Always Below 1 Ω
      b4-9 (RCL+) or d2-2 - Body ground Always 10 kΩ or higher
      b4-11 (RCL-) - d2-1 Always Below 1 Ω
      b4-11 (RCL-) or d2-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a4-3 (SLD+) - a1-4 (FWD) Always Below 1 Ω
      a4-3 (SLD+) or a1-4 (FWD) - Body ground Always 10 kΩ or higher
      a4-4 (SLD-) - a1-1 (BACK) Always Below 1 Ω
      a4-4 (SLD-) or a1-1 (BACK) - Body ground Always 10 kΩ or higher
      a4-5 (FRV-) - a2-1 Always Below 1 Ω
      a4-5 (FRV-) or a2-1 - Body ground Always 10 kΩ or higher
      a4-8 (FRV+) - a2-2 Always Below 1 Ω
      a4-8 (FRV+) or a2-2 - Body ground Always 10 kΩ or higher
      a4-10 (LFT+) - a3-4 Always Below 1 Ω
      a4-10 (LFT+) or a3-4 - Body ground Always 10 kΩ or higher
      a4-12 (LFT-) - a3-1 Always Below 1 Ω
      a4-12 (LFT-) or a3-1 - Body ground Always 10 kΩ or higher
      a4-9 (RCL+) - c2-2 Always Below 1 Ω
      a4-9 (RCL+) or c2-2 - Body ground Always 10 kΩ or higher
      a4-11 (RCL-) - c2-1 Always Below 1 Ω
      a4-11 (RCL-) or c2-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) - BATTERY)


    1. Disconnect the b5*1 or a5*2 position control ECU and switch assembly (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
      b5-12 (SYSB) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      a5-12 (SYSB) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. 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

  10. 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

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


    1. Disconnect the b4*1 or a4*2 position control ECU and switch 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
      b4-6 (+B2) - b6-5 (B) Always Below 1 Ω
      b4-6 (+B2) or b6-5 (B) - Body ground Always 10 kΩ or higher
      b4-1 (GND2) - b6-2 (E2) Always Below 1 Ω
      b4-1 (GND2) or b6-2 (E2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a4-6 (+B2) - a19-5 (B) Always Below 1 Ω
      a4-6 (+B2) or a19-5 (B) - Body ground Always 10 kΩ or higher
      a4-1 (GND2) - a19-2 (E2) Always Below 1 Ω
      a4-1 (GND2) or a19-2 (E2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. 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
      b6-1 (R) - d3-2 Always Below 1 Ω
      b6-1 (R) or d3-2 - Body ground Always 10 kΩ or higher
      b6-3 (H) - d3-1 Always Below 1 Ω
      b6-3 (H) or d3-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a19-1 (R) - c4-1 Always Below 1 Ω
      a19-1 (R) or c4-1 - Body ground Always 10 kΩ or higher
      a19-3 (H) - c4-2 Always Below 1 Ω
      a19-3 (H) or c4-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the position control ECU and switch assembly (front passenger 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
      Front vertical and lifter functions do not operate C

    B

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

    C

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) - BATTERY) Click here

    A

  14. 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 / Passenger Seat / Data List.

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


      Body Electrical > Passenger 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 > Passenger 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 POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) Click here

    OK

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


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

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


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

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

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

      Body Electrical > Passenger 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 POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) Click here

    C

    INSPECT FRONT SEATBACK FRAME SUB-ASSEMBLY (FRONT PASSENGER SEAT) Click here

    B

  16. INSPECT FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASSENGER SEAT)

    Tech Tips

    Check the motor operation of applicable function.


    1. Remove the front seat adjuster assembly (front passenger 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 18 Click here

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (FRONT PASSENGER SEAT) Click here

  17. INSPECT FRONT SEATBACK FRAME SUB-ASSEMBLY (FRONT PASSENGER SEAT)


    1. Remove the front seatback frame sub-assembly (front passenger seat).

      Click here

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the a4*1 or b4*2 position control ECU and switch assembly (front passenger 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 position control ECU and switch assembly (front passenger seat) and applicable motor.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      a4-3 (SLD+) - a1-4 (FWD) Always Below 1 Ω
      a4-3 (SLD+) or a1-4 (FWD) - Body ground Always 10 kΩ or higher
      a4-4 (SLD-) - a1-1 (BACK) Always Below 1 Ω
      a4-4 (SLD-) or a1-1 (BACK) - Body ground Always 10 kΩ or higher
      a4-5 (FDWN) - a2-1 Always Below 1 Ω
      a4-5 (FDWN) or a2-1 - Body ground Always 10 kΩ or higher
      a4-8 (FUP) - a2-2 Always Below 1 Ω
      a4-8 (FUP) or a2-2 - Body ground Always 10 kΩ or higher
      a4-10 (LFT+) - a3-4 Always Below 1 Ω
      a4-10 (LFT+) or a3-4 - Body ground Always 10 kΩ or higher
      a4-12 (LFT-) - a3-1 Always Below 1 Ω
      a4-12 (LFT-) or a3-1 - Body ground Always 10 kΩ or higher
      a4-9 (RCL+) - c2-2 Always Below 1 Ω
      a4-9 (RCL+) or c2-2 - Body ground Always 10 kΩ or higher
      a4-11 (RCL-) - c2-1 Always Below 1 Ω
      a4-11 (RCL-) or c2-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      b4-3 (SLD+) - b1-4 (FWD) Always Below 1 Ω
      b4-3 (SLD+) or b1-4 (FWD) - Body ground Always 10 kΩ or higher
      b4-4 (SLD-) - b1-1 (BACK) Always Below 1 Ω
      b4-4 (SLD-) or b1-1 (BACK) - Body ground Always 10 kΩ or higher
      b4-5 (FDWN) - b3-1 Always Below 1 Ω
      b4-5 (FDWN) or b3-1 - Body ground Always 10 kΩ or higher
      b4-8 (FUP) - b3-2 Always Below 1 Ω
      b4-8 (FUP) or b3-2 - Body ground Always 10 kΩ or higher
      b4-10 (LFT+) - b2-4 Always Below 1 Ω
      b4-10 (LFT+) or b2-4 - Body ground Always 10 kΩ or higher
      b4-12 (LFT-) - b2-1 Always Below 1 Ω
      b4-12 (LFT-) or b2-1 - Body ground Always 10 kΩ or higher
      b4-9 (RCL+) - d2-2 Always Below 1 Ω
      b4-9 (RCL+) or d2-2 - Body ground Always 10 kΩ or higher
      b4-11 (RCL-) - d2-1 Always Below 1 Ω
      b4-11 (RCL-) or d2-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  19. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) - BATTERY)


    1. Disconnect the a5*1 or b5*2 position control ECU and switch assembly (front passenger 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
      a5-12 (SYSB) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      b5-12 (SYSB) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR