FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) 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 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 front power seat switch LH or front power seat switch RH. After receiving the request signal, the front power seat switch LH or front power seat switch RH memorizes the location data of each motor.

WIRING DIAGRAM

1. 

   for Driver

2. 

   for Front Passenger

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK FRONT POWER SEAT OPERATION

   
   

   1. Check that each function of the power seat operates normally by using the front power seat switch LH or front power seat switch RH (Click here).

      OK
      Each function of the power seat operates normally using the front power seat switch LH or front power seat switch RH.

      Result
      Result Proceed to OK (for Driver) A OK (for Front Passenger) B NG C

   
   
   • AClick here
   • BClick here
   • C

     GO TO PROBLEM SYMPTOMS TABLE (Click here)

2. Click here

   READ VALUE USING GTS (SEAT MEMORY SWITCH)

   
   

   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 / Mirror L / Data List

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

      Table 1. Mirror L

      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	-

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

   
   
   • OKClick here
   • NGClick here
3. Click here

   PERFORM ACTIVE TEST USING GTS (BUZZER)

   
   

   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 / Driver Seat / Data List.

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

      Table 2. Driver Seat

      Tester Display	Test Part	Control Range	Diagnostic Note
      Buzzer	Buzzer operation	OFF/ON	-

      OK
      Buzzer sounds normally.

   
   
   • OKClick here
   • NG

     REPLACE FRONT POWER SEAT SWITCH LH (Click here)

4. Click here

   REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FOR DRIVER)

   
   

   1. Replace the outer mirror control ECU assembly (for driver) (Click here).

   
   
   • NEXTClick here
5. Click here

   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 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.

      OK
      Seat position memory function operates normally.

   
   
   • OK

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

   • NGClick here
6. Click here

   REPLACE FRONT POWER SEAT SWITCH LH

   
   

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

   
   
   • NEXTClick here
7. Click here

   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 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.

      OK
      Seat position memory function operates normally.

   
   
   • OK

     END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

   • NG

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

8. Click here

   INSPECT SEAT MEMORY SWITCH (FOR DRIVER)

   
   
   1. 

      Remove the seat memory switch (for driver) (Click here).

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 - 5 M1 switch is pressed Below 1 Ω M1 switch is not pressed 10 kΩ or higher 2 - 5 M2 switch is pressed Below 1 Ω M2 switch is not pressed 10 kΩ or higher 3 - 5 M3 switch is pressed Below 1 Ω M3 switch is not pressed 10 kΩ or higher 4 - 5 SET switch is pressed Below 1 Ω SET switch is not pressed 10 kΩ or higher

      Table 3. Text in Illustration

      *1	M1 Switch
      *2	M2 Switch
      *3	M3 Switch
      *4	SET Switch
      *a	Component without harness connected (Seat Memory Switch (for Driver))

   
   
   • OKClick here
   • NG

     REPLACE SEAT MEMORY SWITCH (FOR DRIVER) (Click here)

9. Click here

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

   
   

   1. Disconnect the M9 outer mirror control ECU assembly (for driver) connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition M9-2 (M1) - M10-1 (1) Always Below 1 Ω M9-3 (M2) - M10-2 (2) Always Below 1 Ω M9-4 (M3) - M10-3 (3) Always Below 1 Ω M9-1 (MM) - M10-4 (MMRY) Always Below 1 Ω M9-7 (GND) - Body ground Always Below 1 Ω M10-5 (E) - Body ground Always Below 1 Ω M9-2 (M1) - Body ground Always 10 kΩ or higher M9-3 (M2) - Body ground Always 10 kΩ or higher M9-4 (M3) - Body ground Always 10 kΩ or higher M9-1 (MM) - Body ground Always 10 kΩ or higher

   
   
   • OK

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

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

10. Click here

    READ VALUE USING GTS (SEAT MEMORY SWITCH)

    
    

    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 / Mirror R / Data List

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

       Table 4. Mirror R

       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	-

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

    
    
    • OKClick here
    • NGClick here
11. Click here

    PERFORM ACTIVE TEST USING GTS (BUZZER)

    
    

    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 / Passenger Seat / Data List.

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

       Table 5. Passenger Seat

       Tester Display	Test Part	Control Range	Diagnostic Note
       Buzzer	Buzzer operation	OFF/ON	-

       OK
       Buzzer sounds normally.

    
    
    • OKClick here
    • NG

      REPLACE FRONT POWER SEAT SWITCH RH (Click here)

12. Click here

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER)

    
    

    1. Replace the outer mirror control ECU assembly (for front passenger) (Click here).

    
    
    • NEXTClick here
13. Click here

    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 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.

       OK
       Seat position memory function operates normally.

    
    
    • OK

      END (OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER) WAS DEFECTIVE)

    • NGClick here
14. Click here

    REPLACE FRONT POWER SEAT SWITCH RH

    
    

    1. Replace the front power seat switch RH (Click here).

    
    
    • NEXTClick here
15. Click here

    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 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.

       OK
       Seat position memory function operates normally.

    
    
    • OK

      END (FRONT POWER SEAT SWITCH RH WAS DEFECTIVE)

    • NG

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

16. Click here

    INSPECT SEAT MEMORY SWITCH (FOR FRONT PASSENGER)

    
    
    1. 

       Remove the seat memory switch (for front passenger) (Click here).

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

       Standard Resistance
       Tester Connection Condition Specified Condition 1 - 5 M1 switch is pressed Below 1 Ω M1 switch is not pressed 10 kΩ or higher 2 - 5 M2 switch is pressed Below 1 Ω M2 switch is not pressed 10 kΩ or higher 3 - 5 M3 switch is pressed Below 1 Ω M3 switch is not pressed 10 kΩ or higher 4 - 5 SET switch is pressed Below 1 Ω SET switch is not pressed 10 kΩ or higher

       Table 6. Text in Illustration

       *1	M1 Switch
       *2	M2 Switch
       *3	M3 Switch
       *4	SET Switch
       *a	Component without harness connected (Seat Memory Switch (for Front Passenger))

    
    
    • OKClick here
    • NG

      REPLACE SEAT MEMORY SWITCH (FOR FRONT PASSENGER)

17. Click here

    CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER) - SEAT MEMORY SWITCH (FOR FRONT PASSENGER) - BODY GROUND)

    
    

    1. Disconnect the L10 outer mirror control ECU assembly (for front passenger) connector.

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

       Standard Resistance

       Tester Connection Condition Specified Condition L10-2 (M1) - L11-1 (M1) Always Below 1 Ω L10-3 (M2) - L11-2 (M2) Always Below 1 Ω L10-4 (M3) - L11-3 (M3) Always Below 1 Ω L10-1 (MM) - L11-4 (MRY) Always Below 1 Ω L10-7 (GND) - Body ground Always Below 1 Ω L11-5 (E) - Body ground Always Below 1 Ω L10-2 (M1) - Body ground Always 10 kΩ or higher L10-3 (M2) - Body ground Always 10 kΩ or higher L10-4 (M3) - Body ground Always 10 kΩ or higher L10-1 (MM) - Body ground Always 10 kΩ or higher

    
    
    • OK

      REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER) (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR