FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) Power Seat does not Return to Memorized Position

DESCRIPTION

When either the M1 or M2 switch is pressed, the outer mirror control ECU assembly 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 front power seat switch LH (w/ Memory). The front power seat switch LH (w/ Memory) operates each motor to achieve each memorized position value.

WIRING DIAGRAM

A01ET1JE23

INSPECTION PROCEDURE

Note

The front power seat control system (w/ Memory) uses the CAN communication system. First, confirm that there is no malfunction in the communication system by checking communication function of the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure Click here.

PROCEDURE


  1. CHECK FRONT POWER SEAT CONTROL SYSTEM


    1. Check that each function of the power seat operates normally by using the switches on the power seat switch Click here.

      OK
      Each function of the power seat operates normally using the switches on the power seat switch.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. CHECK SEAT POSITION MEMORY FUNCTION


    1. Store a seat position in memory and check that the buzzer sounds to indicate that a position has been stored Click here.

      Note


      • The seat position will not be recorded if the SET switch and 2 of the 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.

      OK
      Seat position memory function is normal.

    NG

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

    OK

  3. CHECK SEAT POSITION RESTORING FUNCTION


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


      • Engine switch is off.

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

      • The engine switch is turned off within 180 seconds after the driver door is closed and opened.*2

      • The engine switch is turned off within 60 seconds after the driver 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

    B

    READ VALUE USING GTS (PARK (P) STATE) Click here

    C

    READ VALUE USING GTS (DRIVER DOOR COURTESY SWITCH) Click here

    A

  4. READ VALUE USING GTS (SEAT POSITION MEMORY)


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

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

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

      Driver Seat (Front Power Seat Switch LH (w/ Memory))
      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

      		 -
      OK
      Mem appears on the GTS screen.

    NG

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

    OK

  5. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH


    1. Replace the outer mirror control ECU assembly LH Click here.


    NEXT

  6. CHECK SEAT POSITION RESTORING FUNCTION


    1. Restore a memorized seat position Click here.

    2. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.

      Note


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

      OK
      Seat position restoring function operates normally.

    NG

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here

    OK

    END (OUTER MIRROR CONTROL ECU LH WAS DEFECTIVE)

  7. REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY)


    1. Replace the front power seat switch LH (w/ Memory) Click here.


    NEXT

  8. CHECK SEAT POSITION RESTORING FUNCTION


    1. Store a seat position in memory Click here.

    2. Restore a memorized seat position Click here.

    3. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.

      Note


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

      OK
      Seat position restoring function operates normally.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH LH (W/ MEMORY) WAS DEFECTIVE)

  9. READ VALUE USING GTS (PARK (P) STATE)


    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 / Driver Seat / Data List.

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

      Driver Seat (Front Power Seat Switch LH (w/ Memory))
      Tester Connection Measurement Item/Range Normal Condition Diagnostic Note
      P Switch Park state signal / ON or OFF

      ON: Shift lever in P

      OFF: Shift lever in a position other than P

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

    NG

    GO TO AUTOMATIC TRANSAXLE SYSTEM Click here

    OK

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here

  10. READ VALUE USING GTS (DRIVER DOOR COURTESY SWITCH)


    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 / Main Body / Data List.

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

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      Tester Connection Measurement Item/Range Normal Condition Diagnostic Note
      FR Door Courtesy Front door courtesy light switch assembly signal / OPEN or CLOSE

      OPEN: Driver door open

      CLOSE: Driver door closed

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

    NG

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

    OK

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here