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FRONT POWER SEAT CONTROL SYSTEM Power Seat does not Return to Memorized Position

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DTC Code DTC Name
  Power Seat does not Return to Memorized Position
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DESCRIPTION

When either the M1, M2 or M3 switch is pressed, the front multiplex network door ECU LH sends a switch signal to the main body ECU (multiplex network body ECU) via CAN communication. Then, the main body ECU (multiplex network body ECU) sends a recall request signal to the position control ECU assembly. The position control ECU assembly operates each motor to achieve each memorized position value.

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WIRING DIAGRAM


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  1. Figure 2. for RHD: B004YV6E07
    Figure 1. for LHD: B004YV6E06

    for Driver Seat:

  2. Figure 4. for RHD: B004YV6E09
    Figure 3. for LHD: B004YV6E08

    for Front Passenger Seat:

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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 are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

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  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

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

Tip:

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

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

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PROCEDURE


  1. Click here

    CHECK FRONT POWER SEAT CONTROL OPERATION


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

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      OK
      Each function of the power seat operates normally using the front power seat switch.
      Result
      Proceed to
      OK
      NG

  2. Click here

    CHECK SEAT POSITION MEMORY FUNCTION


    1. Check that the seat position memory function.

      Click here

      OK
      Seat position memory function is normal.
      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK SEAT POSITION RESTORING FUNCTION


    1. Under each of the following conditions, check that the seat position restoring function operates by pressing the M1, M2 or M3 switch.

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      • The power switch is on (IG), and the shift lever is in P.*1

      • The power switch is turned off within 180 seconds after the driver door or front passenger door is closed and opened.*2

      • The power switch is turned off within 60 seconds after the driver door or front passenger door is opened and closed.*3

      Result
      Result Proceed to
      Seat position restoring function does not operate at all. A
      Seat position restoring function does not operate when the condition is *1. B

      • Seat position restoring function does not operate when the condition is *2.

      • Seat position restoring function does not operate when the condition is *3.

      		 C

  4. Click here

    READ VALUE USING GTS (SEAT MEMORY No1, SEAT MEMORY No2, SEAT MEMORY No3)


    1. Store a seat position in memory for each of the M1, M2 and M3 switches.

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    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

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

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


      1. 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

        		 -





      1. Body Electrical > Driver Seat > Data List
        Tester Display
        Seat Memory No1
        Seat Memory No2
        Seat Memory No3






      OK
      Mem appears on the GTS screen.

    7. Enter the following menus: Body Electrical / Passenger Seat / Data List.

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


      1. Body Electrical > Passenger 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

        		 -





      1. Body Electrical > Passenger Seat > Data List
        Tester Display
        Seat Memory No1
        Seat Memory No2
        Seat Memory No3






      OK
      Mem appears on the GTS screen.
      Result
      Proceed to
      OK
      NG

  5. Click here

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU


    1. Temporarily replace the front multiplex network door ECU with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

  6. Click here

    CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check that the seat position memory and restoring function.

      Click here

      OK
      Seat position memory and restoring function operates normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (FRONT MULTIPLEX NETWORK DOOR ECU WAS DEFECTIVE)

    • NGClick here
  7. Click here

    REPLACE POSITION CONTROL ECU ASSEMBLY


    1. Temporarily replace the position control ECU assembly with a new or known good one.

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      Result
      Proceed to
      NEXT

  8. Click here

    CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check that the seat position memory and restoring function.

      Click here

      OK
      Seat position memory and restoring function operates normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (POSITION CONTROL ECU ASSEMBLY WAS DEFECTIVE)

    • NG

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

  9. Click here

    READ VALUE USING GTS (SHIFT SW POSITION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Turn the GTS on.

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

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


      1. Body Electrical > Driver Seat > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Shift SW Position Park state signal Shift P or Shift Other

        Shift P: Shift lever in P

        Shift Other: Shift lever in a position other than P

        		 -



      1. Body Electrical > Driver Seat > Data List
        Tester Display
        Shift SW Position




      OK
      On the GTS screen, the item changes between ON and OFF according to the above.

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

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


      1. Body Electrical > Passenger Seat > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Shift SW Position Park state signal Shift P or Shift Other

        Shift P: Shift lever in P

        Shift Other: Shift lever in a position other than P

        		 -



      1. Body Electrical > Passenger Seat > Data List
        Tester Display
        Shift SW Position




      OK
      On the GTS screen, the item changes between ON and OFF according to the above.
      Result
      Proceed to
      OK
      NG

  10. Click here

    READ VALUE USING GTS (FR DOOR COUTESY SW, FL DOOR COUTESY SW)


    1. Connect the GTS to the DLC3.

    2. Turn the power 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.


      1. Body Electrical > Main Body > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        FR Door Lock Pos Front door courtesy light switch assembly RH signal ON or OFF

        ON: Front door RH open

        OFF: Front door RH closed

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

        ON: Front door LH open

        OFF: Front door LH closed

        		 -




      1. Body Electrical > Main Body > Data List
        Tester Display
        FR Door Courtesy SW
        FL Door Courtesy SW





      OK
      On the GTS screen, the item changes between ON and OFF according to the above.
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE POSITION CONTROL ECU ASSEMBLYClick here

    • NG

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