FRONT POWER SEAT CONTROL SYSTEM Wireless Transmitter Memory Function does not Operate

DESCRIPTION

With the engine switch on (IG) and the driver door closed, pressing the manual lock or unlock switch on the multiplex network master switch assembly while holding a seat memory switch (M1, M2 or M3 switch) will register the transmitter recognition code into the seat memory switch that was pressed. After registration is completed, the answer back buzzer sounds.

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 switches. The seat memory function does 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 switches. The seat memory restoring function does not operate unless the switches are released.

  • The front power seat control system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Service Bulletin.

  • Initializing the position control ECU assembly will clear the seat position memory.

Tech Tips


  • Make sure to initialize the position control ECU assembly after replacing the seat assembly or any related parts (including removal and installation).

  • Before initializing the seat ECU, make sure that the D/C CUT fuse is normal.

  • When any of the following conditions are met, the seat position Information in the position control ECU assembly will be cleared.


    • The engine switch is turned off with any of the seat switches being operated and the D/C CUT fuse removed.

    • The engine switch is turned off within 1 second of any of the seat switches being operated with the D/C CUT fuse removed.

PROCEDURE


  1. CHECK POWER DOOR LOCK CONTROL SYSTEM


    1. Check the manual lock/unlock function by using the door control switch (multiplex network master switch assembly).

      Click here

      OK
      Manual lock/unlock function operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

    OK

  2. CHECK ENTRY AND START SYSTEM (for Start Function)


    1. Check that the SFI system starts normally when the engine switch is pressed while carrying the key and with the brake pedal depressed.

      Click here

      OK
      SFI system starts normally.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check the seat position memory and restoring function.

      Click here

      Result
      Result Proceed to
      OK A
      NG (seat position memory function does not operate normally) B
      NG (seat position restoring function does not operate normally) C

    B

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

    C

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

    A

  4. READ VALUE USING GTS (FR DOOR COURTESY SW, FL DOOR COURTESY SW)


    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 Front door courtesy light switch assembly RH signal ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 for RHD
      FL Door Courtesy SW Front door courtesy light switch assembly LH signal ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 for LHD

      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL Door Courtesy SW
      OK
      ON or OFF appears on the screen according to the driver door condition.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  5. CHECK MEMORY CALL FUNCTION (MEMORY REGISTRATION)


    1. Check the memory registration of the memory call function.

      Click here

      OK
      Memory registration operates normally.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  6. READ VALUE USING GTS (MEM SW NO. W/KEYID#)


    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
      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

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Mem SW No. w/KeyID1
      Mem SW No. w/KeyID2
      Mem SW No. w/KeyID3
      Mem SW No. w/KeyID4
      Mem SW No. w/KeyID5
      Mem SW No. w/KeyID6
      Mem SW No. w/KeyID7
      OK
      On the GTS display, it is confirmed that the memory call has been registered.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  7. CHECK MEMORY CALL FUNCTION (MEMORY REGISTRATION AND AUTOMATIC MEMORY CALL FUNCTION)


    1. Check the memory registration and automatic memory call function of the memory call function.

      Click here

      OK
      Memory registration and automatic memory call function operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    GO TO OTHER DIAGNOSTIC PROCEDURE (Wireless-linked Return Function does not Operate) Click here

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


    1. Replace the main body ECU (multiplex network body ECU) with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK MEMORY CALL FUNCTION (MEMORY REGISTRATION)


    1. Check the memory registration of the memory call function.

      Click here

      OK
      Memory registration operates normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  10. REPLACE POSITION CONTROL ECU ASSEMBLY (FOR DRIVER SEAT)


    1. Temporarily replace the position control ECU assembly (for Driver Seat) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK MEMORY CALL FUNCTION (MEMORY REGISTRATION)


    1. Check the memory registration of the memory call function.

      Click here

      OK
      Memory registration operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (POSITION CONTROL ECU ASSEMBLY (FOR DRIVER SEAT) WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)