FRONT POWER SEAT CONTROL SYSTEM Power Seat Position is not Memorized

DESCRIPTION

The main body ECU (multiplex network body ECU) receives seat memory switch signals from the outer mirror control ECU assembly LH*1 or RH*2 via CAN communication. If the seat memory SET switch is being pressed when the M1, M2 or M3 switch is pressed, or if the M1, M2 or M3 switch 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 front power seat switch LH*1 or RH*2. After receiving the request signal, the front power seat switch LH*1 or RH*2 memorizes the location data of each motor.


WIRING DIAGRAM

Figure 1. for LHD

B006KIUE04

Figure 2. for RHD

B006KIUE03

CAUTION / NOTICE / HINT

Note


  • 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

  • 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.

  • The seat will not return to the memorized position if the 2 seat memory switches 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.

  • 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: for LHD

    • *2: for RHD


    1. Check that each function of the power seat operates normally by using the front power seat switch LH*1 or RH*2.

      Click here

      OK
      Each function of the power seat operates normally using the front power seat switch LH*1 or RH*2.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. READ VALUE USING GTS (SEAT MEMORY SWITCH1, SEAT MEMORY SWITCH2, SEAT MEMORY SWITCH3, SEAT MEMORY SET 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 / Mirror L*1 or R*2 / Data List.


      • *1: for LHD

      • *2: for RHD

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


      1. for LHD


        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

        		 -

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

      2. for RHD


        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

        		 -

        Body Electrical > Mirror R > Data List
        Tester Display
        Seat Memory Switch1
        Seat Memory Switch2
        Seat Memory Switch3
        Seat Memory Set SW
      OK
      The GTS display changes correctly in response to the switch operation.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SEAT MEMORY SWITCH Click here

    OK

  3. 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.


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

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Buzzer
      OK
      Buzzer sounds/stops normally using the GTS operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

  4. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY


    • *1: for LHD

    • *2: for RHD


    1. Replace the outer mirror control ECU assembly LH*1 or RH*2 with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check 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 WAS DEFECTIVE)

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

  6. INSPECT SEAT MEMORY SWITCH


    1. Remove the seat memory switch.

      Click here

    2. Inspect the seat memory switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEAT MEMORY SWITCH Click here

    OK

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


    • *1: for LHD

    • *2: for RHD


    1. Disconnect the I28*1 or I13*2 outer mirror control ECU assembly LH*1 or RH*2 connector.

    2. Disconnect the c2*1 or c1*2 seat memory switch connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      I28-1 (MM) - c2-5 (MRY) Always Below 1 Ω
      I28-1 (MM) or c2-5 (MRY) - Body ground Always 10 kΩ or higher
      I28-2 (M1) - c2-4 (M1) Always Below 1 Ω
      I28-2 (M1) or c2-4 (M1) - Body ground Always 10 kΩ or higher
      I28-3 (M2) - c2-2 (M2) Always Below 1 Ω
      I28-3 (M2) or c2-2 (M2) - Body ground Always 10 kΩ or higher
      I28-4 (M3) - c2-1 (M3) Always Below 1 Ω
      I28-4 (M3) or c2-1 (M3) - Body ground Always 10 kΩ or higher
      I28-7 (GND) - Body ground Always Below 1 Ω
      c2-7 (E) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      I13-1 (MM) - c1-5 (MRY) Always Below 1 Ω
      I13-1 (MM) or c1-5 (MRY) - Body ground Always 10 kΩ or higher
      I13-2 (M1) - c1-4 (M1) Always Below 1 Ω
      I13-2 (M1) or c1-4 (M1) - Body ground Always 10 kΩ or higher
      I13-3 (M2) - c1-2 (M2) Always Below 1 Ω
      I13-3 (M2) or c1-2 (M2) - Body ground Always 10 kΩ or higher
      I13-4 (M3) - c1-1 (M3) Always Below 1 Ω
      I13-4 (M3) or c1-1 (M3) - Body ground Always 10 kΩ or higher
      I13-7 (GND) - Body ground Always Below 1 Ω
      c1-7 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR