FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) Wireless-linked Return Function does not Operate

DESCRIPTION

When a door is unlocked using the wireless unlock function or entry unlock function, the certification ECU (smart key ECU assembly) sends a door unlock signal and key ID signal to the main body ECU (multiplex network body ECU). When the main body ECU (multiplex network body ECU) receives the door unlock signal, it stores the key ID. When the driver door is opened, the memory call and memory command information of the stored key ID is sent to each driving position related control ECU. Each control ECU receives the memory commands and performs the memory call operation according to predetermined control timing values.

INSPECTION PROCEDURE

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) or certification ECU (smart key ECU) is replaced, refer to Service Bulletin.

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


    1. Check the operation of the power seats Click here.

    2. Check whether seat positions can be stored in memory Click here.

    3. Check whether seat positions can be restored Click here.

    4. Check the operation of memory call registration Click here.

      Result
      Result Proceed to
      OK A
      NG (power seat operation) B
      NG (seat position memory) C
      NG (seat position restoring) D
      NG (memory call registration) E

    B

    GO TO PROBLEM SYMPTOMS TABLE Click here

    C

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

    D

    GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat does not Return to Memorized Position) Click here

    E

    GO TO OTHER DIAGNOSIS PROCEDURE (Wireless Transmitter Memory Function does not Operate) Click here

    A

  2. CHECK MEMORY CALL FUNCTION (WIRELESS UNLOCK OR ENTRY UNLOCK)


    1. Turn the engine switch off.

    2. Close and lock all doors.

    3. Unlock the driver door by pressing the unlock switch of the memory call registered key (wireless unlock function).

    4. Unlock the driver door by touching the driver door outside handle while holding the memory call registered key (entry unlock function).

    5. Open the driver door and check that the driver seat moves to the memorized position.

      Result
      Result Proceed to
      Memory call function linked with the wireless unlock function does not operate. A
      Memory call function linked with the entry unlock function does not operate. B
      Both memory call function linked with the wireless unlock function and entry unlock function do not operate. C

    B

    CHECK SMART ENTRY AND START SYSTEM (ENTRY UNLOCK FUNCTION) Click here

    C

    CHECK MEMORY CALL FUNCTION (MIRROR OPERATION) Click here

    A

  3. CHECK WIRELESS DOOR LOCK CONTROL SYSTEM


    1. Check the wireless unlock function Click here.

      OK
      Wireless unlock function is normal.

    NG

    GO TO WIRELESS DOOR LOCK CONTROL SYSTEM Click here

    OK

  4. CHECK MEMORY CALL FUNCTION (MIRROR OPERATION)


    1. Use the memory call function and check the outer mirror operation Click here.

      Result
      Result Proceed to
      Outer mirrors operate normally A
      Outer mirrors do not operate normally B

    B

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

    A

  5. REPLACE FRONT POWER SEAT SWITCH LH


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


    NEXT

  6. CHECK MEMORY CALL FUNCTION


    1. Store a seat position in memory Click here.

    2. Perform memory call registration Click here.

    3. Turn the engine switch off.

    4. Close and lock all doors.

    5. Unlock the driver door by pressing the unlock switch of the memory call registered key or touching the driver door outside handle while holding the memory call registered key.

    6. Open the driver door and check that the driver seat moves to the memorized position Click here.

      OK
      Driver seat moves to the memorized position.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

  7. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Replace the main body ECU (multiplex network body ECU) Click here.


    NEXT

  8. CHECK MEMORY CALL FUNCTION


    1. Store a seat position in memory Click here.

    2. Perform memory call registration Click here.

    3. Turn the engine switch off.

    4. Close and lock all doors.

    5. Unlock the driver door by pressing the unlock switch of the memory call registered key or touching the driver door outside handle while holding the memory call registered key.

    6. Open the driver door and check that the driver seat moves to the memorized position Click here.

      OK
      Driver seat moves to the memorized position.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE)

  9. CHECK SMART ENTRY AND START SYSTEM (ENTRY UNLOCK FUNCTION)


    1. Check the entry unlock function of the smart entry and start system Click here.

      OK
      Entry unlock function is normal.

    NG

    GO TO SMART ENTRY AND START SYSTEM (for Entry Function) Click here

    OK

  10. CHECK MEMORY CALL FUNCTION (MIRROR OPERATION)


    1. Use the memory call function and check the outer mirror operation Click here.

      Result
      Result Proceed to
      Outer mirrors operate normally A
      Outer mirrors do not operate normally B

    B

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

    A

  11. REPLACE FRONT POWER SEAT SWITCH LH


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


    NEXT

  12. CHECK MEMORY CALL FUNCTION


    1. Store a seat position in memory Click here.

    2. Perform memory call registration Click here.

    3. Turn the engine switch off.

    4. Close and lock all doors.

    5. Unlock the driver door by pressing the unlock switch of the memory call registered key or touching the driver door outside handle while holding the memory call registered key.

    6. Open the driver door and check that the driver seat moves to the memorized position Click here.

      OK
      Driver seat moves to the memorized position.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

  13. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Replace the main body ECU (multiplex network body ECU) Click here.


    NEXT

  14. CHECK MEMORY CALL FUNCTION


    1. Store a seat position in memory Click here.

    2. Perform memory call registration Click here.

    3. Turn the engine switch off.

    4. Close and lock all doors.

    5. Unlock the driver door by pressing the unlock switch of the memory call registered key or touching the driver door outside handle while holding the memory call registered key.

    6. Open the driver door and check that the driver seat moves to the memorized position Click here.

      OK
      Driver seat moves to the memorized position.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE)

  15. CHECK MEMORY CALL FUNCTION (MIRROR OPERATION)


    1. Use the memory call function and check the outer mirror operation Click here.

      Result
      Result Proceed to
      Outer mirrors operate normally A
      Outer mirrors do not operate normally B

    B

    READ VALUE USING GTS (MEMORY CALL REGISTRATION) Click here

    A

  16. REPLACE FRONT POWER SEAT SWITCH LH


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


    NEXT

  17. CHECK MEMORY CALL FUNCTION


    1. Store a seat position in memory Click here.

    2. Perform memory call registration Click here.

    3. Turn the engine switch off.

    4. Close and lock all doors.

    5. Unlock the driver door by pressing the unlock switch of the memory call registered key or touching the driver door outside handle while holding the memory call registered key.

    6. Open the driver door and check that the driver seat moves to the memorized position Click here.

      OK
      Driver seat moves to the memorized position.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

  18. READ VALUE USING GTS (MEMORY CALL REGISTRATION)


    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.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Mem SW No. w/KeyID1 Memory switch linked with key ID1 / NONE, MEM SW1, MEM SW2, or MEM SW3

      NONE: No switches linked with key ID1

      MEM SW1: M1 switch linked with key ID1

      MEM SW2: M2 switch linked with key ID1

      MEM SW3: M3 switch linked with key ID1

      		 -
      Mem SW No. w/KeyID2 Memory switch linked with key ID2 / NONE, MEM SW1, MEM SW2, or MEM SW3

      NONE: No switches linked with key ID2

      MEM SW1: M1 switch linked with key ID2

      MEM SW2: M2 switch linked with key ID2

      MEM SW3: M3 switch linked with key ID2

      		 -
      Mem SW No. w/KeyID3 Memory switch linked with key ID3 / NONE, MEM SW1, MEM SW2, or MEM SW3

      NONE: No switches linked with key ID3

      MEM SW1: M1 switch linked with key ID3

      MEM SW2: M2 switch linked with key ID3

      MEM SW3: M3 switch linked with key ID3

      		 -
      Mem SW No. w/KeyID4 Memory switch linked with key ID4 / NONE, MEM SW1, MEM SW2, or MEM SW3

      NONE: No switches linked with key ID4

      MEM SW1: M1 switch linked with key ID4

      MEM SW2: M2 switch linked with key ID4

      MEM SW3: M3 switch linked with key ID4

      		 -
      Mem SW No. w/KeyID5 Memory switch linked with key ID5 / NONE, MEM SW1, MEM SW2, or MEM SW3

      NONE: No switches linked with key ID5

      MEM SW1: M1 switch linked with key ID5

      MEM SW2: M2 switch linked with key ID5

      MEM SW3: M3 switch linked with key ID5

      		 -
      Mem SW No. w/KeyID6 Memory switch linked with key ID6 / NONE, MEM SW1, MEM SW2, or MEM SW3

      NONE: No switches linked with key ID6

      MEM SW1: M1 switch linked with key ID6

      MEM SW2: M2 switch linked with key ID6

      MEM SW3: M3 switch linked with key ID6

      		 -
      Mem SW No. w/KeyID7 Memory switch linked with key ID7 / NONE, MEM SW1, MEM SW2, or MEM SW3

      NONE: No switches linked with key ID7

      MEM SW1: M1 switch linked with key ID7

      MEM SW2: M2 switch linked with key ID7

      MEM SW3: M3 switch linked with key ID7

      		 -

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

    7. 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
      On the GTS display, it is confirmed that the memory switch which is linked with a key ID has a memorized seat position. (For example, on the GTS display, "Mem SW No. w/KeyID1" displays "MEM SW1" and "Seat Memory No1" displays "Mem".)

    NG

    PERFORM MEMORY CALL REGISTRATION Click here

    OK

  19. 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.

      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, each item changes between ON and OFF according to the above.

    NG

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

    OK

  20. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Replace the main body ECU (multiplex network body ECU) Click here.


    NEXT

  21. CHECK MEMORY CALL FUNCTION


    1. Store a seat position in memory Click here.

    2. Perform memory call registration Click here.

    3. Turn the engine switch off.

    4. Close and lock all doors.

    5. Unlock the driver door by pressing the unlock switch of the memory call registered key or touching the driver door outside handle while holding the memory call registered key.

    6. Open the driver door and check that the driver seat moves to the memorized position Click here.

      OK
      Driver seat moves to the memorized position.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE)