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FRONT POWER SEAT CONTROL SYSTEM Power Seat Position is not Memorized

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DTC Code DTC Name
  Power Seat Position is not Memorized
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DESCRIPTION

The main body ECU (multiplex network body ECU) receives seat memory switch (driver door) signals from the outer mirror control ECU assembly (driver door) via CAN communication. If the seat memory SET switch is being pressed when one of the M1, M2 or M3 switches is pressed, or if one of the M1, M2 or M3 switches is pressed within 3 seconds of pressing the seat memory SET switch, the main body ECU (multiplex network body ECU) sends a memory request signal to the position control ECU and switch assembly (driver seat). After receiving the request signal, the position control ECU and switch assembly (driver seat) memorizes the location data of each motor.

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WIRING DIAGRAM

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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.

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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 position control ECU and switch assembly (driver seat).

      Click here

      OK
      Each function of the power seat operates normally using the position control ECU and switch assembly (driver seat).
      Result
      Proceed to
      OK
      NG

  2. Click here

    READ VALUE USING GTS (SEAT MEMORY SWITCH (DRIVER DOOR))


    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 / Mirror L*1 or Mirror R*2 / Data List.


      • *1: for LHD

      • *2: for RHD

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


      1. Body Electrical > Mirror L > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Seat Memory Switch1 M1 switch ON or OFF

        ON: M1 switch on

        OFF: M1 switch off

        		 -
        Seat Memory Switch2 M2 switch ON or OFF

        ON: M2 switch on

        OFF: M2 switch off

        		 -
        Seat Memory Switch3 M3 switch ON or OFF

        ON: M3 switch on

        OFF: M3 switch off

        		 -
        Seat Memory Set SW SET switch ON or OFF

        ON: SET switch on

        OFF: SET switch off

        		 -






      1. Body Electrical > Mirror L > Data List
        Tester Display
        Seat Memory Switch1
        Seat Memory Switch2
        Seat Memory Switch3
        Seat Memory Set SW








      1. Body Electrical > Mirror R > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Seat Memory Switch1 M1 switch ON or OFF

        ON: M1 switch on

        OFF: M1 switch off

        		 -
        Seat Memory Switch2 M2 switch ON or OFF

        ON: M2 switch on

        OFF: M2 switch off

        		 -
        Seat Memory Switch3 M3 switch ON or OFF

        ON: M3 switch on

        OFF: M3 switch off

        		 -
        Seat Memory Set SW SET switch ON or OFF

        ON: SET switch on

        OFF: SET switch off

        		 -






      1. Body Electrical > Mirror R > Data List
        Tester Display
        Seat Memory Switch1
        Seat Memory Switch2
        Seat Memory Switch3
        Seat Memory Set SW







      OK
      ON or OFF is displayed on the GTS according to the table above.
      Result
      Proceed to
      OK
      NG

  3. Click here

    PERFORM ACTIVE TEST USING GTS (BUZZER)


    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 / Driver Seat / Active Test.

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


      1. Body Electrical > Driver Seat > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Buzzer Buzzer operation OFF/ON -



      1. Body Electrical > Driver Seat > Active Test
        Tester Display
        Buzzer




      OK
      Buzzer sounds normally.
      Result
      Proceed to
      OK
      NG

  4. Click here

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)


    1. Temporarily replace the outer mirror control ECU assembly (driver door) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

  5. 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 operate normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) WAS DEFECTIVE)

    • NGClick here
  6. Click here

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT)


    1. Temporarily replace the position control ECU and switch assembly (driver seat) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

  7. 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 operate normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) WAS DEFECTIVE)

    • NG

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

  8. Click here

    INSPECT SEAT MEMORY SWITCH (DRIVER DOOR)


    1. Remove the seat memory switch (driver door).

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    2. Inspect the seat memory switch (driver door).

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      Result
      Proceed to
      OK
      NG

  9. Click here

    CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) - SEAT MEMORY SWITCH (DRIVER DOOR) - BODY GROUND)


    1. Disconnect the S12*1 or R12*2 outer mirror control ECU assembly (driver door) connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Table 1. for LHD
      Tester Connection Condition Specified Condition
      S12-1 (MM) - S5-4 (MMRY) Always Below 1 Ω
      S12-1 (MM) or S5-4 (MMRY) - Body ground Always 10 kΩ or higher
      S12-2 (M1) - S5-1 (1) Always Below 1 Ω
      S12-2 (M1) or S5-1 (1) - Body ground Always 10 kΩ or higher
      S12-3 (M2) - S5-2 (2) Always Below 1 Ω
      S12-3 (M2) or S5-2 (2) - Body ground Always 10 kΩ or higher
      S12-4 (M3) - S5-3 (3) Always Below 1 Ω
      S12-4 (M3) or S5-3 (3) - Body ground Always 10 kΩ or higher
      S12-7 (GND) - Body ground Always Below 1 Ω
      S5-5 (E) - Body ground Always Below 1 Ω
      Table 2. for RHD
      Tester Connection Condition Specified Condition
      R12-1 (MM) - R5-4 (MRY) Always Below 1 Ω
      R12-1 (MM) or R5-4 (MRY) - Body ground Always 10 kΩ or higher
      R12-2 (M1) - R5-1 (M1) Always Below 1 Ω
      R12-2 (M1) or R5-1 (M1) - Body ground Always 10 kΩ or higher
      R12-3 (M2) - R5-2 (M2) Always Below 1 Ω
      R12-3 (M2) or R5-2 (M2) - Body ground Always 10 kΩ or higher
      R12-4 (M3) - R5-3 (M3) Always Below 1 Ω
      R12-4 (M3) or R5-3 (M3) - Body ground Always 10 kΩ or higher
      R12-7 (GND) - Body ground Always Below 1 Ω
      R5-5 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR