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

DESCRIPTION

When either the M1, M2 or M3 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 front power seat switch LH or front power seat switch RH. The front power seat switch LH or front power seat switch RH operates each motor to achieve each memorized position value.

WIRING DIAGRAM


  1. for Driver

    A0003WQE50

  2. for Front Passenger

    A0003WQE02

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


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

      OK
      Each function of the power seat operates normally using the switches on the front power seat switch LH or front power seat switch RH.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. CHECK SEAT POSITION MEMORY FUNCTION


    1. Store a seat position in memory and check that the buzzer sounds to indicate that a position has been stored Click here.

      Note


      • The seat position will not be recorded 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 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) A
      OK (for Front Passenger) B
      NG C

    B

    CHECK SEAT POSITION RESTORING FUNCTION Click here

    C

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

    A

  3. CHECK SEAT POSITION RESTORING FUNCTION


    1. Under each of the following conditions, check that the seat position 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 the shift lever is in P.*1

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

      • The power 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 (PARK (P) STATE) Click here

    C

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

    A

  4. READ VALUE USING GTS (SEAT POSITION MEMORY)


    1. Store a seat position in memory for each of the M1, M2 or M3 switches 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 DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) Click here

    OK

  5. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FOR DRIVER)


    1. Replace the outer mirror control ECU assembly (for driver) Click here.


    NEXT

  6. CHECK SEAT POSITION RESTORING FUNCTION


    1. Restore a memorized seat position 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 be recorded 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 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.

    OK

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

    NG

  7. REPLACE FRONT POWER SEAT SWITCH LH


    1. Replace the front power seat switch LH Click here.


    NEXT

  8. CHECK SEAT POSITION RESTORING FUNCTION


    1. Store a seat position in memory Click here.

    2. Restore a memorized seat position 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 be recorded 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 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.

    OK

    END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

    NG

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

  9. READ VALUE USING GTS (PARK (P) STATE)


    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 Connection Measurement Item/Range Normal Condition Diagnostic Note
      Shift P sw (PMN) Park state signal / ON or OFF

      ON: Shift lever in P

      OFF: Shift lever in a position other than P

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

    OK

    REPLACE FRONT POWER SEAT SWITCH LH Click here

    NG

    GO TO HYBRID CONTROL SYSTEM (P0705-757) Click here

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

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

      Main Body
      Tester Connection Measurement Item/Range Normal Condition Diagnostic Note
      FL Door Courtesy SW Front door courtesy light switch assembly (for LH) 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.

    OK

    REPLACE FRONT POWER SEAT SWITCH LH Click here

    NG

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

  11. CHECK SEAT POSITION RESTORING FUNCTION


    1. Under each of the following conditions, check that the seat position 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 the shift lever is in P.*1

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

      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. C

    B

    READ VALUE USING GTS (PARK (P) STATE) Click here

    C

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

    A

  12. READ VALUE USING GTS (SEAT POSITION MEMORY)


    1. Store a seat position in memory for each of the M1, M2 or M3 switches 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 DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) Click here

    OK

  13. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER)


    1. Replace the outer mirror control ECU assembly (for front passenger) Click here.


    NEXT

  14. CHECK SEAT POSITION RESTORING FUNCTION


    1. Restore a memorized seat position 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 be recorded 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 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.

    OK

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

    NG

  15. REPLACE FRONT POWER SEAT SWITCH RH


    1. Replace the front power seat switch RH Click here.


    NEXT

  16. CHECK SEAT POSITION RESTORING FUNCTION


    1. Store a seat position in memory Click here.

    2. Restore a memorized seat position 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 be recorded 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 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.

    OK

    END (FRONT POWER SEAT SWITCH RH WAS DEFECTIVE)

    NG

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

  17. READ VALUE USING GTS (PARK (P) STATE)


    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 Connection Measurement Item/Range Normal Condition Diagnostic Note
      Shift P sw (PMN) Park state signal / ON or OFF

      ON: Shift lever in P

      OFF: Shift lever in a position other than P

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

    OK

    REPLACE FRONT POWER SEAT SWITCH RH Click here

    NG

    GO TO HYBRID CONTROL SYSTEM (P0705-757) Click here

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

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

      Main Body
      Tester Connection Measurement Item/Range Normal Condition Diagnostic Note
      FR Door Courtesy SW Front door courtesy light switch assembly (for RH) signal / ON or OFF

      ON: Front passenger door open

      OFF: Front passenger door closed

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

    OK

    REPLACE FRONT POWER SEAT SWITCH RH Click here

    NG

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