FRONT POWER SEAT CONTROL SYSTEM (for LHD) Power Seat does not Return to Memorized Position

DESCRIPTION

When any of the M1, M2 or M3 switches is pressed, the front multiplex network door ECU LH*1, *2 or front multiplex network door ECU RH*3 sends a switch signal to the main body ECU (multiplex network body ECU) via CAN communication. Then, the main body ECU (multiplex network body ECU) sends a recall request signal to the power seat switch assembly*1 or position control ECU assembly*2, *3. The power seat switch assembly*1 or position control ECU assembly*2, *3 operates each motor to achieve each memorized position value.


WIRING DIAGRAM


  1. for Driver Side (Standard Seat Type):

    A01FS7IE08

  2. for Driver Side (Sports Seat Type, Luxury Seat Type):

    A01FS7IE09

  3. for Front Passenger Side (Luxury Seat Type):

    A01FUJ2E05

INSPECTION PROCEDURE

Note

If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally Click here.

      OK
      CAN communication system DTC is not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. CHECK FRONT POWER SEAT CONTROL SYSTEM


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

      OK
      Each function of the power seat operates normally using the switches on the power seat switch.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  3. CHECK SEAT POSITION MEMORY FUNCTION


    1. Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation Click here.

      Note


      • The seat position will not be recorded if the SET switch and 2 or more of the memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.

      • If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

      OK
      Seat position memory function is normal.
      Result
      Result Proceed to
      OK (for Driver Seat) A
      OK (for Front Passenger Seat) B
      NG C

    B

    CHECK SEAT POSITION MEMORY FUNCTION Click here

    C

    GO TO OTHER FLOW CHART (Power Seat Position is not Memorized) Click here

    A

  4. CHECK SEAT POSITION RESTORING FUNCTION


    1. Under each of the following conditions, check that the seat restoring function operates by pressing the M1 switch, M2 switch or M3 switch Click here.


      • Power switch is off.

      • The power switch is on (IG), and shift position park (P) is selected.*1

      • The power switch is off within 180 seconds after the driver door is closed and opened.*2

      • The power switch is off within 60 seconds after the driver door is opened and closed.*3

      Result
      Result Proceed to
      Seat restoring function does not operate at all. A
      Seat restoring function does not operate when the condition is [*1]. B

      • Seat restoring function does not operate when the condition is [*2].

      • Seat restoring function does not operate when the condition is [*3].

      		 C

    B

    READ VALUE USING GTS (SHIFT SW POSITION) Click here

    C

    READ VALUE USING GTS (FL DOOR COURTESY SW) Click here

    A

  5. READ VALUE USING GTS (SEAT MEMORY)


    1. Perform the seat position memorized function for the M1, M2 and M3 switch Click here.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

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

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

      Driver Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Seat Memory No1 Seat position memorized with M1 switch / Mem or Not Mem

      Mem: Memorized

      Not Mem: Not memorized

      		 -
      Seat Memory No2 Seat position memorized with M2 switch / Mem or Not Mem

      Mem: Memorized

      Not Mem: Not memorized

      		 -
      Seat Memory No3 Seat position memorized with M3 switch / Mem or Not Mem

      Mem: Memorized

      Not Mem: Not memorized

      		 -
      OK
      Mem appears on the GTS screen.

    NG

    GO TO OTHER FLOW CHART (Power Seat Position is not Memorized) Click here

    OK

  6. REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH


    1. Temporarily replace the front multiplex network door ECU LH with a new or normally functioning one Click here.


    NEXT

  7. CHECK SEAT POSITION RESTORING FUNCTION


    1. Perform a seat position restoring function Click here.

    2. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.

      Note


      • The seat position will not return to the memorized position if 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.

      • If a restoring operation has failed, release all switches. The seat memory restoring function does not operate unless the switches are released.

      OK
      Seat position restoring function operates normally.
      Result
      Result Proceed to
      OK A
      NG (for Standard Seat Type) B
      NG (for Sports Seat Type, Luxury Seat Type) C

    B

    REPLACE POWER SEAT SWITCH ASSEMBLY Click here

    C

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    A

    END (FRONT MULTIPLEX NETWORK DOOR ECU LH WAS DEFECTIVE)

  8. REPLACE POWER SEAT SWITCH ASSEMBLY


    1. Temporarily replace the power seat switch assembly with a new or normally functioning one Click here.


    NEXT

  9. CHECK SEAT POSITION RESTORING FUNCTION


    1. Perform a seat position memory function Click here.

    2. Perform a seat position restoring function Click here.

    3. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.

      Note


      • The seat position will not return to the memorized position if 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.

      • If a restoring operation has failed, release all switches. The seat memory restoring function does not operate unless the switches are released.

      OK
      Seat position restoring function operates normally.

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

    END (POWER SEAT SWITCH ASSEMBLY WAS DEFECTIVE)

  10. REPLACE POSITION CONTROL ECU ASSEMBLY


    1. Temporarily replace the position control ECU assembly with a new or normally functioning one.



    NEXT

  11. CHECK SEAT POSITION RESTORING FUNCTION


    1. Perform a seat position memory function Click here.

    2. Perform a seat position restoring function Click here.

    3. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.

      Note


      • The seat position will not return to the memorized position if 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.

      • If a restoring operation has failed, release all switches. The seat memory restoring function does not operate unless the switches are released.

      OK
      Seat position restoring function operates normally.

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

    END (POSITION CONTROL ECU ASSEMBLY WAS DEFECTIVE)

  12. READ VALUE USING GTS (SHIFT SW POSITION)


    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.

      Driver Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Shift SW Position Park (P) state signal / Shift Other or Shift P

      Shift P: Park (P) selected

      Shift Other: Shift state other than park (P) selected

      		 -
      OK
      The GTS display changes according to the shift lever operation.
      Result
      Result Proceed to
      OK (for Standard Seat Type) A
      OK (for Sports Seat Type) B
      OK (for Luxury Seat Type) C
      NG D

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    C

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    D

    GO TO HYBRID CONTROL SYSTEM Click here

    A

    REPLACE POWER SEAT SWITCH ASSEMBLY Click here

  13. READ VALUE USING GTS (FL DOOR COURTESY SW)


    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 / Main Body / Data List.

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

      Main Body (Main Body ECU [Multiplex Network Body ECU])
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FL Door Courtesy SW Front door courtesy light switch assembly signal / ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 -
      OK
      On the GTS screen, the item changes between ON and OFF according to the above.
      Result
      Result Proceed to
      OK (for Standard Seat Type) A
      OK (for Sport Seat Type) B
      OK (for Luxury Seat Type) C
      NG D

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    C

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    D

    GO TO LIGHTING SYSTEM Click here

    A

    REPLACE POWER SEAT SWITCH ASSEMBLY Click here

  14. CHECK SEAT POSITION MEMORY FUNCTION


    1. Under each of the following conditions, check that the seat restoring function operates by pressing the M1 switch, M2 switch or M3 switch Click here.


      • Power switch is off.

      • The power switch is on (IG), and shift position park (P) is selected.*1

      • The power switch is off within 180 seconds after the front passenger door is closed and opened.*2

      OK
      Seat position memory function is normal.
      Result
      Result Proceed to
      Seat restoring function does not operate at all. A
      Seat restoring function does not operate when the condition is [*1]. B
      Seat restoring function does not operate when the condition is [*2]. C

    B

    READ VALUE USING GTS (SHIFT SW POSITION) Click here

    C

    READ VALUE USING GTS (FR DOOR COURTESY SW) Click here

    A

  15. READ VALUE USING GTS (SEAT MEMORY)


    1. Perform the seat position memorized function for the M1, M2 and M3 switch Click here.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Passenger Seat / Data List.

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

      Passenger Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Seat Memory No1 Seat position memorized with M1 switch / Mem or Not Mem

      Mem: Memorized

      Not Mem: Not memorized

      		 -
      Seat Memory No2 Seat position memorized with M2 switch / Mem or Not Mem

      Mem: Memorized

      Not Mem: Not memorized

      		 -
      Seat Memory No3 Seat position memorized with M3 switch / Mem or Not Mem

      Mem: Memorized

      Not Mem: Not memorized

      		 -
      OK
      Mem appears on the GTS screen.

    NG

    GO TO OTHER FLOW CHART (Power Seat Position is not Memorized) Click here

    OK

  16. REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH


    1. Temporarily replace the front multiplex network door ECU RH with a new or normally functioning one Click here.


    NEXT

  17. CHECK SEAT POSITION RESTORING FUNCTION


    1. Perform a seat position memory function Click here.

    2. Perform a seat position restoring function Click here.

    3. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.

      Note


      • The seat position will not return to the memorized position if 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.

      • If a restoring operation has failed, release all switches. The seat memory restoring function does not operate unless the switches are released.

      OK
      Seat position restoring function operates normally.

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

    END (FRONT MULTIPLEX NETWORK DOOR ECU RH WAS DEFECTIVE)

  18. READ VALUE USING GTS (SHIFT SW POSITION)


    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 / Passenger Seat / Data List.

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

      Passenger Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Shift SW Position Park (P) state signal / Shift Other or Shift P

      Shift P: Park (P) selected

      Shift Other: Shift state other than park (P) selected

      		 -
      OK
      The GTS display changes according to the shift lever operation.

    NG

    GO TO HYBRID CONTROL SYSTEM Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  19. READ VALUE USING GTS (FR DOOR COURTESY SW)


    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 / Main Body / Data List.

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

      Main Body (Main Body ECU [Multiplex Network Body ECU])
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Door Courtesy SW Front door courtesy light switch assembly signal / ON or OFF

      ON: Passenger door open

      OFF: Passenger door closed

      		 -
      OK
      On the GTS screen, the item changes between ON and OFF according to the above.

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here