FRONT POWER SEAT CONTROL SYSTEM Wireless-linked Return Function does not Operate

DESCRIPTION

When a door is unlocked using the wireless unlock function, the certification ECU (smart key ECU assembly) sends a key ID signal to the main body ECU (multiplex network body ECU). When a door is unlocked using the 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.

CAUTION / NOTICE / HINT

Note


  • The seat position will not be stored if the SET switch and the 2 seat memory switches are pressed simultaneously.

    If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

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

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in How to Proceed with Troubleshooting to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.

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 (MEMORY REGISTRATION AND AUTOMATIC MEMORY CALL FUNCTION)


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

      Click here

      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 (for Entry Function) Click here

    C

    CHECK MEMORY CALL FUNCTION (POWER MIRROR OPERATION) Click here

    A

  3. CHECK WIRELESS DOOR LOCK CONTROL SYSTEM


    1. Check the wireless unlock function of the wireless door lock control system.

      Click here

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

    NG

    GO TO WIRELESS DOOR LOCK CONTROL SYSTEM Click here

    OK

  4. CHECK MEMORY CALL FUNCTION (POWER MIRROR OPERATION)


    1. Using the memory call function, check the power mirror operation.

      Click here

      Result
      Result Proceed to
      Power mirror operates normally A
      Power mirror does not operate normally B

    B

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

    A

  5. REPLACE FRONT POWER SEAT SWITCH


    • *1: for LHD

    • *2: for RHD


    1. Replace the front power seat switch LH*1 or RH*2 with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. 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 call function linked with the wireless unlock function operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT POWER SEAT SWITCH WAS DEFECTIVE)

    NG

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

  7. 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

  8. 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 call function linked with the wireless unlock function operates normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  9. CHECK SMART ENTRY AND START SYSTEM (for Entry Function)


    1. Check the entry unlock function of the smart entry and start system (for Entry Function).

      Click here

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

    NG

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

    OK

  10. CHECK MEMORY CALL FUNCTION (POWER MIRROR OPERATION)


    1. Using the memory call function, check the power mirror operation.

      Click here

      Result
      Result Proceed to
      Power mirror operates normally A
      Power mirror does not operate normally B

    B

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

    A

  11. REPLACE FRONT POWER SEAT SWITCH


    • *1: for LHD

    • *2: for RHD


    1. Replace the front power seat switch LH*1 or RH*2 with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  12. 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 call function linked with the entry unlock function operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT POWER SEAT SWITCH WAS DEFECTIVE)

    NG

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

  13. 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

  14. 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 call function linked with the entry unlock function operates normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  15. CHECK MEMORY CALL FUNCTION (POWER MIRROR OPERATION)


    1. Using the memory call function, check the power mirror operation.

      Click here

      Result
      Result Proceed to
      Power mirror operates normally A
      Power mirror does not operate normally B

    B

    READ VALUE USING GTS (MEMORY CALL REGISTRATION) Click here

    A

  16. REPLACE FRONT POWER SEAT SWITCH


    • *1: for LHD

    • *2: for RHD


    1. Replace the front power seat switch LH*1 or RH*2 with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  17. 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 call function linked with the wireless unlock and entry unlock function operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT POWER SEAT SWITCH WAS DEFECTIVE)

    NG

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

  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.


      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

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

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


      Body Electrical > Driver Seat > Data List
      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

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Seat Memory No1
      Seat Memory No2
      Seat Memory No3
      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".)
      Result
      Proceed to
      OK
      NG

    NG

    PERFORM MEMORY CALL REGISTRATION Click here

    OK

  19. READ VALUE USING GTS (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 SW Front door courtesy light switch assembly RH signal*2 ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 -
      FL Door Courtesy SW Front door courtesy light switch assembly LH signal*1 ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 -

      • *1: for LHD

      • *2: for RHD


      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL Door Courtesy SW
      OK
      On the GTS screen, each item changes between ON and OFF according to the above.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO LIGHTING SYSTEM (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) with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  21. 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 call function linked with the wireless unlock and entry unlock function operate normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)