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

DESCRIPTION

When a door is unlocked, 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

Tech Tips

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      OK
      CAN communication DTC is not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. CHECK MEMORY CALL MEMORY FUNCTION


    1. While pressing the M1 switch, M2 switch or M3 switch, press the manual lock or unlock switch. Then check that the buzzer sounds for 0.5 seconds Click here.

      OK
      Buzzer sounds normally.

    NG

    GO TO OTHER FLOW CHART (Wireless Transmitter Memory Function does not Operate) Click here

    OK

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


    1. Make sure that the power switch is off.

    2. Make sure that all doors are closed and locked.

    3. Unlock the doors using the wireless function and entry function respectively. Check if the memory call function operates Click here.

      Result
      Result Proceed to
      Automatic wireless memory call function is not normal A
      Automatic entry call function is not normal B
      Both are abnormal C

    B

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

    C

    CHECK MEMORY CALL FUNCTION (MIRROR) Click here

    A

  4. CHECK WIRELESS UNLOCK FUNCTION


    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

  5. CHECK MEMORY CALL FUNCTION (MIRROR)


    1. Perform memory call to check outer mirror operation Click here.

      Result
      Result Proceed to
      Operates normally A
      Does not operate normally B

    B

    READ VALUE USING INTELLIGENT TESTER Click here

    A

  6. CHECK POWER SEAT POWER EASY ACCESS SYSTEM


    1. Move the shift lever to P.

    2. Check if the power easy access system operates normally when engaging and disengaging the seatbelt tongue plate.

      Tech Tips


      • Make sure that the power easy access system customize setting is set to Standard Click here.

      OK
      Power seat power easy access system is normal.

    NG

    GO TO OTHER FLOW CHART (Power Seat Power Easy Access System Function does not Operate) Click here

    OK

  7. REPLACE FRONT POWER SEAT SWITCH (DRIVER SIDE)


    1. Replace the front power seat switch (driver side) Click here.


    NEXT

  8. CHECK MEMORY CALL FUNCTION


    1. With a recognition code stored in memory, open the driver door by pressing the transmitter unlock switch. Check that the driver side power seat moves to the memorized position Click here.

      OK
      Driver side power seat moves to the memorized position.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH (DRIVER SIDE) WAS DEFECTIVE)

  9. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Main Body
      Tester Connection Measurement Item/Range Normal Condition Diagnostic Note
      D-Door Courtesy Front door courtesy light switch assembly signal / ON or OFF

      ON: Driver side door open

      OFF: Driver side door closed

      		 -
      OK
      ON or OFF appears on the screen.

    NG

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

    OK

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


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


    NEXT

  11. CHECK MEMORY CALL FUNCTION


    1. With a recognition code stored in memory, open the driver door by pressing the transmitter unlock switch. Check that the driver side power seat moves to the memorized position Click here.

      OK
      Driver side power 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)

  12. CHECK ENTRY AND START SYSTEM (ENTRY UNLOCK FUNCTION)


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

      OK
      Entry unlock function is normal.

    NG

    GO TO ENTRY AND START SYSTEM Click here

    OK

  13. CHECK MEMORY CALL FUNCTION (MIRROR)


    1. Perform memory call to check outer mirror operation Click here.

      Result
      Result Proceed to
      Operates normally A
      Does not operate normally B

    B

    READ VALUE USING INTELLIGENT TESTER Click here

    A

  14. CHECK POWER SEAT POWER EASY ACCESS SYSTEM


    1. Move the shift lever to P.

    2. Check if the power easy access system operates normally when engaging and disengaging the seatbelt tongue plate.

      Tech Tips


      • Make sure that the power easy access system customize setting is set to Standard Click here.

      OK
      Power seat power easy access system is normal.

    NG

    GO TO OTHER FLOW CHART (Power Seat Power Easy Access System Function does not Operate) Click here

    OK

  15. REPLACE FRONT POWER SEAT SWITCH (DRIVER SIDE)


    1. Replace the front power seat switch Click here.


    NEXT

  16. CHECK MEMORY CALL FUNCTION


    1. With a recognition code stored in memory, open the driver door by performing an entry unlock operation. Check that the driver side power seat moves to the memorized position Click here.

      OK
      Driver side power seat moves to the memorized position.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH (DRIVER SIDE) WAS DEFECTIVE)

  17. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Main Body
      Tester Connection Measurement Item/Range Normal Condition Diagnostic Note
      D-Door Courtesy Front door courtesy light switch assembly signal / ON or OFF

      ON: Driver side door open

      OFF: Driver side door closed

      		 -
      OK
      ON or OFF appears on the screen.

    NG

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

    OK

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


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


    NEXT

  19. CHECK MEMORY CALL FUNCTION


    1. With a recognition code stored in memory, open the driver door by performing an entry unlock operation. Check that the driver side power seat moves to the memorized position Click here.

      OK
      Driver side power 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)

  20. CHECK MEMORY CALL FUNCTION (MIRROR)


    1. Perform memory call to check outer mirror operation Click here.

      Result
      Result Proceed to
      Operates normally A
      Does not operate normally B

    B

    READ VALUE USING INTELLIGENT TESTER Click here

    A

  21. CHECK SEAT MEMORY FUNCTION


    1. Perform a seat memory operation properly Click here.

    2. Check that the buzzer sounds for 0.5 seconds to indicate the completion of the memory operation.

      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 operates normally.

    NG

    CHECK FRONT SEAT CONTROL FUNCTION Click here

    OK

  22. REPLACE FRONT POWER SEAT SWITCH (DRIVER SIDE)


    1. Replace the front power seat switch (driver side) Click here.


    NEXT

  23. CHECK SEAT RESTORING FUNCTION


    1. With a recognition code stored in memory, open the driver door by performing an entry unlock operation or by pressing the transmitter unlock switch. Check that the driver side power seat moves to the memorized position Click here.

      OK
      Driver side power seat moves to the memorized position.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH (DRIVER SIDE) WAS DEFECTIVE)

  24. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Main Body
      Tester Connection Measurement Item/Range Normal Condition Diagnostic Note
      D-Door Courtesy Front door courtesy light switch assembly signal / ON or OFF

      ON: Driver side door open

      OFF: Driver side door closed

      		 -
      OK
      ON or OFF appears on the screen.

    NG

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

    OK

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


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


    NEXT

  26. CHECK MEMORY CALL FUNCTION


    1. With a recognition code stored in memory, open the driver door by performing an entry unlock operation or by pressing the transmitter unlock switch. Check that the driver side power seat moves to the memorized position Click here.

      OK
      Driver side power 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)

  27. CHECK FRONT SEAT CONTROL FUNCTION


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

      OK
      Each function of the power seat operates normally using the switches on the front power seat switch (driver side).

    NG

    GO TO OTHER FLOW CHART (Front Power Seat does not Operate with Front Power Seat Switch) Click here

    OK

    GO TO OTHER FLOW CHART (Power Seat does not Return to Memorized Position) Click here