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*1 or entry unlock function*2, 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.


CAUTION / NOTICE / HINT

Note


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

    Click here

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE


  1. CHECK FRONT POWER SEAT CONTROL SYSTEM


    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 ignition 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. (w/o Entry and Start System) A
      Memory call function linked with the entry unlock function does not operate. (w/ Entry and Start System) B

    B

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

    A

  3. CHECK WIRELESS UNLOCK FUNCTION


    1. Check the wireless unlock function.

      Click here

      OK
      Wireless unlock function is normal.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 5 Click here

    NG

    GO TO WIRELESS DOOR LOCK CONTROL SYSTEM Click here

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


    1. Check the entry unlock function of the smart key system.

      Click here

      OK
      Entry unlock function is normal.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  5. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY


    1. Replace the position control ECU and switch assembly.

      Click here

      Result
      Proceed to
      NEXT

    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 ignition 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.
      Result
      Proceed to
      OK
      NG

    OK

    END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)

    NG

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