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

DESCRIPTION

When any of the M1, M2 or M3 switches is pressed, the outer mirror control ECU assembly LH*1, RH*2 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 assembly LH*1, RH*2. The front power seat switch LH*1, RH*2 operates each motor to achieve each memorized position value.

*1: for LHD

*2: for RHD

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Use the GTS to check if the CAN communication system is functioning normally.

      
      

      • for LHD (w/ Central Gateway ECU): Click here

      • for LHD (w/o Central Gateway ECU): Click here

      • for RHD (w/ Central Gateway ECU): Click here

      • for RHD (w/o Central Gateway ECU): Click here

      OK
      CAN communication DTC is not output.
      Result: Result Proceed to OK A NG (for LHD (w/ Central Gateway ECU)) B NG (for LHD (w/o Central Gateway ECU)) C NG (for RHD (w/ Central Gateway ECU)) D NG (for RHD (w/o Central Gateway ECU)) E

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   C

   CHECK CAN COMMUNICATION SYSTEM Click here

   D

   CHECK CAN COMMUNICATION SYSTEM Click here

   E

   CHECK CAN COMMUNICATION SYSTEM Click here

   A

2. 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

3. CHECK SEAT POSITION MEMORY FUNCTION

   
   

   1. Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation Click here.

      Note

      
      

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

      OK
      Seat position memory function is normal.

   
   

   NG

   GO TO OTHER FLOW CHART (Power Seat Position is not Memorized) Click here

   OK

4. CHECK SEAT POSITION RESTORING FUNCTION

   
   

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

      
      

      • Engine switch is off.

      • The engine switch is on (IG), and park (P) is selected.*1

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

      • The engine switch is off within 60 seconds after the driver door is opened and closed.*3

      Result:

      Result	Proceed to
      Seat restoring function does not operate at all.	A
      Seat restoring function does not operate when the condition is [*1].	B
      Seat restoring function does not operate when the condition is [*2]. Seat restoring function does not operate when the condition is [*3].	C

   
   

   B

   READ VALUE USING GTS (SHIFT SW POSITION) Click here

   C

   READ VALUE USING GTS (DOOR COURTESY SW) Click here

   A

5. READ VALUE USING GTS (SEAT MEMORY)

   
   

   1. Perform the seat position memorized function for the M1, M2 and M3 switch 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 Electrical / Driver Seat / Data List.

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

      Driver Seat

      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	-

      OK
      Mem appears on the GTS screen.

   
   

   NG

   GO TO OTHER FLOW CHART (Power Seat Position is not Memorized) Click here

   OK

6. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY

   
   

   1. Temporarily replace the outer mirror control ECU LH*1, RH*2 with a new or normally functioning one Click here.

      
      

      • *1: for LHD

      • *2: for RHD

   
   

   NEXT

7. CHECK SEAT POSITION RESTORING FUNCTION

   
   

   1. Perform a seat position restoring function Click here.

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

      Note

      
      

      • The seat position 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.

      OK
      Seat position restoring function operates normally.

   
   

   OK

   END (OUTER MIRROR CONTROL ECU ASSEMBLY WAS DEFECTIVE)

   NG

8. REPLACE FRONT POWER SEAT SWITCH

   
   

   1. Temporarily replace the front power seat switch LH*1, RH*2 with a new or normally functioning one Click here.

      
      

      • *1: for LHD

      • *2: for RHD

   
   

   NEXT

9. CHECK SEAT POSITION RESTORING FUNCTION

   
   

   1. Perform a seat position memory and restoring function Click here.

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

      Note

      
      

      • The seat position 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.

      OK
      Seat position restoring function operates normally.
      Result: Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   
   

   A

   END (FRONT POWER SEAT SWITCH WAS DEFECTIVE) Click here

   B

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

   C

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

10. READ VALUE USING GTS (SHIFT SW POSITION)

    
    

    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 / Data List.

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

       Driver Seat

       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	-

       OK
       On the GTS screen, the item changes between ON and OFF according to the above.
       Result: Result Proceed to OK A NG (for AB60F) B NG (for A750F) C NG (for AE80F) D

       Tech Tips

       
       

       *: Go to procedure:

       • for 1UR-FE: Click here

       • for 1VD-FTV (w/ DPF): Click here

       • for 1VD-FTV (w/o DPF): Click here

       • for 1GR-FE: Click here

    
    

    A

    REPLACE FRONT POWER SEAT SWITCH Click here

    B

    GO TO AUTOMATIC TRANSMISSION SYSTEM*

    C

    GO TO AUTOMATIC TRANSMISSION SYSTEM*

    D

    GO TO AUTOMATIC TRANSMISSION SYSTEM Click here

11. 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.

       Main Body

       Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
       FL Door Courtesy SW	Front door courtesy light switch assembly LH signal / ON or OFF	ON: Driver door open OFF: Driver door closed	for LHD
       FR Door Courtesy SW	Front door courtesy light switch assembly RH signal / ON or OFF	ON: Driver door open OFF: Driver door closed	for RHD

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

       Result:

       Result	Proceed to
       OK	A
       NG	B

    
    

    A

    REPLACE FRONT POWER SEAT SWITCH Click here

    B

    GO TO LIGHTING SYSTEM Click here