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

DESCRIPTION

When either the M1, M2 or M3 switch is pressed, the outer mirror control ECU assembly (for Driver Side) 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 (for Driver Side). The front power seat switch (for Driver Side) operates each motor to achieve each memorized position value.

WIRING DIAGRAM

B0059CBE05

CAUTION / NOTICE / HINT

Note


  • The front power seat control system (w/ Memory) 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 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.

  • Before replacing the main body ECU (multiplex network body ECU), refer to the 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 On-Vehicle Inspection 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.*

    *: w/ Door Control Battery

    Click here

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the switches on the front power seat switch (for Driver Side).

      Click here

      OK
      Each function of the power seat operates normally using the front power seat switch (for Driver Side).
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. CHECK SEAT POSITION MEMORY FUNCTION


    1. Check that the seat position memory function.

      Click here

      OK
      Seat position memory function is normal.
      Result
      Proceed to
      OK
      NG

    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, M2 or M3 switch.

      Click here


      • 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 (P SWITCH) Click here

    C

    READ VALUE USING GTS (FR DOOR COURTESY SW, FL DOOR COURTESY SW) Click here

    A

  4. READ VALUE USING GTS (SEAT MEMORY NO1, SEAT MEMORY NO2, SEAT MEMORY NO3)


    1. Store a seat position in memory for each of the M1, M2 and M3 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 Electrical / Driver Seat / Data List.

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


      Body Electrical > Driver Seat > Data List
      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

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Seat Memory No1
      Seat Memory No2
      Seat Memory No3
      OK
      Mem appears on the GTS screen.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  5. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver Side) (for Driver Side)


    1. Replace the outer mirror control ECU assembly (for Driver Side) with a new or normally functioning one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. 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 operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (OUTER MIRROR CONTROL ECU ASSEMBLY [for Driver Side] WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here for RHD: Click here

  7. READ VALUE USING GTS (P 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 Electrical / Driver Seat / Data List.

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


      Body Electrical > Driver Seat > Data List
      Tester Display 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

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      P Switch
      OK
      The GTS display changes correctly in response to the switch operation.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH (for Driver Side) Click here

    NG

    GO TO AUTOMATIC TRANSAXLE SYSTEM for U661E: Click here for U661F: Click here

  8. READ VALUE USING GTS (FR DOOR COURTESY SW, FL 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.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Door Courtesy SW Front door courtesy light switch assembly (driver door) signal*2 ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 -
      FL Door Courtesy SW Front door courtesy light switch assembly (driver door) signal*1 ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 -

      • *1: for LHD

      • *2: for RHD


      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL Door Courtesy SW
      OK
      The GTS display changes correctly in response to the switch operation.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH (for Driver Side) Click here

    NG

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