FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) Power Seat does not Return to Memorized Position

DESCRIPTION

Tech Tips


  • The seat memory switch is a collective term for the seat memory switch (driver door) and the seat memory switch (front passenger door).

  • The outer mirror control ECU assembly is a collective term for the outer mirror control ECU assembly (driver door) and the outer mirror control ECU assembly (front passenger door).

  • The position control ECU and switch assembly is a collective term for the position control ECU and switch assembly (driver seat) and the position control ECU and switch assembly (front passenger seat).

When the M1, M2 or M3 switch of the seat memory switch is pressed, the outer mirror control ECU assembly 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 position control ECU and switch assembly. The position control ECU and switch assembly operates each motor to move the seat to the memorized position.

WIRING DIAGRAM


  1. Driver Seat

    A01VW0YE22

  2. Front Passenger Seat

    A01VW0YE23

CAUTION / NOTICE / HINT

Note


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

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

  • The seat 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 of the switches. The seat memory restoring function will not operate unless the switches are released.

  • The front power seat control system (w/ Memory) uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before proceeding with troubleshooting, perform an on-vehicle inspection and confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*

    Click here


    • *: w/o Canister Pump Module with Door Ajar Warning Buzzer Function

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 CONTROL OPERATION Click here

    A

  2. CHECK FRONT POWER SEAT CONTROL 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

      OK
      Each function of the power seat operates normally using the position control ECU and switch assembly (driver seat).
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  3. CHECK SEAT POSITION MEMORY FUNCTION


    1. Check the seat position memory function.

      Click here

      OK
      Seat position memory function is normal.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) Click here

    OK

  4. CHECK SEAT POSITION RESTORING FUNCTION


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

      Click here


      • The engine switch is on (IG), and the shift lever is in P.*1

      • Within 180 seconds after the driver door is opened with the engine switch off.*2

      • Within 60 seconds after the driver door is opened and then closed with the engine switch off.*3

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

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

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

      		 C

    B

    READ VALUE USING GTS (SHIFT P POSITION STATE) Click here

    C

    READ VALUE USING GTS (DRIVER DOOR COURTESY SWITCH) Click here

    A

  5. READ VALUE USING GTS (SEAT POSITION MEMORY)


    1. Store a seat position in memory for the M1, M2 and M3 switches.

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the engine 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.


      Body Electrical > Driver Seat > Data List
      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

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Seat Memory No1
      Seat Memory No2
      Seat Memory No3
      OK
      Mem is displayed on the GTS screen.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) Click here

    OK

  6. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)


    1. Replace the outer mirror control ECU assembly (driver door) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check the seat position memory and restoring functions.

      Click here

      OK
      Seat position memory and restoring functions operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) WAS DEFECTIVE)

    NG

  8. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT)


    1. Replace the position control ECU and switch assembly (driver seat) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check the seat position memory and restoring functions.

      Click here

      OK
      Seat position memory and restoring functions operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) WAS DEFECTIVE)

    NG

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

  10. READ VALUE USING GTS (SHIFT P POSITION STATE)


    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
      P Switch Park state signal ON or OFF

      ON: Shift lever in P

      OFF: Shift lever in a position other than P

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      P Switch
      OK
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Result Proceed to
      OK A
      NG (for 8AR-FTS) B
      NG (for 2GR-FSE) C

    A

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

    B

    GO TO AUTOMATIC TRANSAXLE SYSTEM (P070513) for U661E: Click here
    GO TO AUTOMATIC TRANSAXLE SYSTEM (P070513) for U661F: Click here

    C

    GO TO AUTOMATIC TRANSAXLE SYSTEM (P0705) for U881E: Click here
    GO TO AUTOMATIC TRANSAXLE SYSTEM (P0705) for U881F: Click here

  11. READ VALUE USING GTS (DRIVER DOOR COURTESY 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 / Main Body / Data List.

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


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Door Courtesy SW Front door courtesy light switch assembly (driver door) signal*2 ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 -
      FL Door Courtesy SW Front door courtesy light switch assembly (driver door) signal*1 ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 -

      • *1: for LHD

      • *2: for RHD


      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL Door Courtesy SW
      OK
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    GO TO LIGHTING SYSTEM (Door Courtesy Switch Circuit) Click here

  12. CHECK FRONT POWER SEAT CONTROL OPERATION


    1. Check that each function of the power seat operates normally by using the switches on the position control ECU and switch assembly (front passenger seat).

      Click here

      OK
      Each function of the power seat operates normally using the switches on the position control ECU and switch assembly (front passenger seat).
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  13. CHECK SEAT POSITION MEMORY FUNCTION


    1. Check the seat position memory function.

      Click here

      OK
      Seat position memory function is normal.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) Click here

    OK

  14. CHECK SEAT POSITION RESTORING FUNCTION


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

      Click here


      • The engine switch is on (IG), and the shift lever is in P.*1

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

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

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

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

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

      		 C

    B

    READ VALUE USING GTS (SHIFT P POSITION STATE) Click here

    C

    READ VALUE USING GTS (FRONT PASSENGER DOOR COURTESY SWITCH) Click here

    A

  15. READ VALUE USING GTS (SEAT POSITION MEMORY)


    1. Store a seat position in memory for each of the M1, M2 and M3 switches.

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the engine 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.


      Body Electrical > Passenger Seat > Data List
      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

      		 -

      Body Electrical > Passenger Seat > Data List
      Tester Display
      Seat Memory No1
      Seat Memory No2
      Seat Memory No3
      OK
      Mem is displayed for each Data List item.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) Click here

    OK

  16. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR)


    1. Temporarily replace the outer mirror control ECU assembly (front passenger door) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  17. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check the seat position memory and restoring functions.

      Click here

      OK
      Seat position memory and restoring functions operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR) WAS DEFECTIVE)

    NG

  18. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT)


    1. Replace the position control ECU and switch assembly (front passenger seat) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  19. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check the seat position memory and restoring functions.

      Click here

      OK
      Seat position memory and restoring functions operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) WAS DEFECTIVE)

    NG

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

  20. READ VALUE USING GTS (SHIFT P POSITION STATE)


    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
      P Switch Park state signal ON or OFF

      ON: Shift lever in P

      OFF: Shift lever in a position other than P

      		 -

      Body Electrical > Passenger Seat > Data List
      Tester Display
      P Switch
      OK
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Result Proceed to
      OK A
      NG (for 8AR-FTS) B
      NG (for 2GR-FSE) C

    A

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

    B

    GO TO AUTOMATIC TRANSAXLE SYSTEM (P070513) for U661E: Click here
    GO TO AUTOMATIC TRANSAXLE SYSTEM (P070513) for U661F: Click here

    C

    GO TO AUTOMATIC TRANSAXLE SYSTEM (P0705) for U881E: Click here
    GO TO AUTOMATIC TRANSAXLE SYSTEM (P0705) for U881F: Click here

  21. READ VALUE USING GTS (FRONT PASSENGER DOOR COURTESY 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 / Main Body / Data List.

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


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Door Courtesy SW Front door courtesy light switch assembly (front passenger door) signal*1 ON or OFF

      ON: Front Passenger door open

      OFF: Front Passenger door closed

      		 -
      FL Door Courtesy SW Front door courtesy light switch assembly (front passenger door) signal*2 ON or OFF

      ON: Front Passenger door open

      OFF: Front Passenger door closed

      		 -

      • *1: for LHD

      • *2: for RHD


      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL Door Courtesy SW
      OK
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    GO TO LIGHTING SYSTEM (Door Courtesy Switch Circuit) Click here