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

DESCRIPTION

When the M1 or M2 switch of the seat memory switch is pressed, the outer mirror control ECU assembly 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 position control ECU assembly. The position control ECU assembly operates each motor to move the seat to the memorized position.

WIRING DIAGRAM


  1. B0083TZE22

CAUTION / NOTICE / HINT

Note


  • 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 of the switches. The seat memory function will 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 of the switches. The seat memory restoring function will not operate unless the switches are released.

  • The front power seat control system (w/ Memory) uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.

    Click here

PROCEDURE


  1. CHECK FRONT POWER SEAT CONTROL OPERATION


    1. Check that each function of the power seat operates normally by using the front power seat switch (driver seat).

      Click here

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

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. CHECK SEAT POSITION MEMORY FUNCTION


    1. Check 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 or M2 switch.

      Click here


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

      • Within 180 seconds after the driver door is opened with the engine switch off.*2

      • Within 60 seconds after the driver door is opened and then closed with the engine switch off.*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 (SHIFT P POSITION 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 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 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

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Seat Memory No1
      Seat Memory No2
      OK
      Mem is displayed 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 (DRIVER DOOR)


    1. Replace the outer mirror control ECU assembly (driver door) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check the seat position memory and restoring functions.

      Click here

      OK
      Seat position memory and restoring functions operate normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    GO TO STEP 8 Click here

  7. READ VALUE USING GTS (SHIFT P POSITION 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: Powertrain / Engine and ECT / Data List. (for 2AR-FE)

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


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Shift SW Status (P Range) Park/neutral position switch status ON or OFF

      ON: Shift lever in P

      OFF: Shift lever not in P

      		 -

      Powertrain > Engine and ECT > Data List
      Tester Display
      Shift SW Status (P Range)
      OK
      On the GTS screen, ON or OFF is displayed accordingly.

    6. Enter the following menus: Powertrain / Engine / Data List. (for 2GR-FKS)

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


      Powertrain > Engine > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Shift SW Status (P Range) Park/neutral position switch status ON or OFF

      ON: Shift lever in P

      OFF: Shift lever not in P

      		 -

      Powertrain > Engine > Data List
      Tester Display
      Shift SW Status (P Range)
      OK
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO AUTOMATIC TRANSAXLE SYSTEM (P0705) Click here

    OK

  8. REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT)


    1. Replace the position control ECU assembly (driver seat) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check the seat position memory and restoring functions.

      Click here

      OK
      Seat position memory and restoring functions operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 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 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
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

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