REAR POWER SEAT CONTROL SYSTEM Power Seat does not Return to Memorized Position

DESCRIPTION

When either memory 1 switch or memory 2 switch are pressed, the switch signal is sent from the rear power seat switch (rear multi operation panel) to the position control ECU assembly via the LIN communication line. The position control ECU assembly will drive the motor until it reaches the value of the stored position sensor.

CAUTION / NOTICE / HINT

Note


  • The rear power seat control system uses the LIN communication system. First, confirm that there are no malfunctions in the LIN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

  • Initializing the position control ECU assembly will clear the seat position memory.

Tech Tips


  • Make sure to initialize the position control ECU assembly after replacing the seat assembly or any related parts (including removal and installation).

  • Before initializing the seat ECU, make sure that the D/C CUT fuse is normal.

  • When any of the following conditions are met, the seat position Information in the position control ECU assembly will be cleared.


    • The power switch is turned off with any of the seat switches being operated and the D/C CUT fuse removed.

    • The power switch is turned off within 1 second of any of the seat switches being operated with the D/C CUT fuse removed.

PROCEDURE


  1. CHECK VEHICLE CONDITION

    Result
    Result Proceed to
    Rear Seat RH malfunction A
    Rear Seat LH malfunction B

    B

    CHECK REAR POWER SEAT CONTROL OPERATION Click here

    A

  2. CHECK REAR POWER SEAT CONTROL OPERATION


    1. Check that each function of the power seat operates normally by using the rear power seat switch (rear multi operation panel).

      Click here

      OK
      Each function of the power seat operates normally using the rear power seat switch (rear multi operation panel).
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  3. 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 DIAGNOSTIC PROCEDURE (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 position restoring function operates by pressing the M1or M2 switch.

      Click here


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

      • The power switch is turned off within 180 seconds after the rear door RH is closed and opened.*2

      • The power switch is turned off within 60 seconds after the rear door RH 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 COUTESY SW, FL DOOR COUTESY SW) Click here

    A

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


    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 / Rear Right Seat / Data List.

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


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

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    NG

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

  6. READ VALUE USING GTS (P SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Rear Right Seat / Data List.

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


      Body Electrical > Rear Right 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 > Rear Right Seat > Data List
      Tester Display
      P Switch
      OK
      On the GTS screen, the item changes between ON and OFF according to the above.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    NG

    GO TO HYBRID CONTROL SYSTEM Click here

  7. READ VALUE USING GTS (FR DOOR COUTESY SW, FL DOOR COUTESY SW)


    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 / Rear Right Seat / Data List.

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


      Body Electrical > Rear Right Seat > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Door Courtesy Rear door courtesy light switch assembly RH signal ON or OFF

      ON: Rear door RH open

      OFF: Rear door RH closed

      		 -

      Body Electrical > Rear Right Seat > Data List
      Tester Display
      Door Courtesy
      OK
      On the GTS screen, the item changes between ON and OFF according to the above.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    NG

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

  8. CHECK REAR POWER SEAT CONTROL OPERATION


    1. Check that each function of the power seat operates normally by using the rear power seat switch (rear multi operation panel).

      Click here

      OK
      Each function of the power seat operates normally using the rear power seat switch (rear multi operation panel).
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  9. 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 DIAGNOSTIC PROCEDURE (Power Seat Position is not Memorized) Click here

    OK

  10. CHECK SEAT POSITION RESTORING FUNCTION


    1. Under each of the following conditions, check that the seat position restoring function operates by pressing the M1or M2 switch.

      Click here


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

      • The power switch is turned off within 180 seconds after the rear door LH is closed and opened.*2

      • The power switch is turned off within 60 seconds after the rear door LH 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 (SHIFT SW POSITION) Click here

    C

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

    A

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


    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 / Rear Left Seat / Data List.

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


      Body Electrical > Rear Left Seat > Data List
      Tester Display Measurement Item Normal Condition Reference Value 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 > Rear Left Seat > Data List
      Tester Display
      Seat Memory No1
      Seat Memory No2
      OK
      Mem appears on the GTS screen.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    NG

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

  12. READ VALUE USING GTS (SHIFT SW POSITION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Rear Left Seat / Data List.

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


      Body Electrical > Rear Left Seat > Data List
      Tester Display Measurement Item Normal Condition Reference Value 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 > Rear Left Seat > Data List
      Tester Display
      P Switch
      OK
      On the GTS screen, the item changes between ON and OFF according to the above.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    NG

    GO TO HYBRID CONTROL SYSTEM Click here

  13. READ VALUE USING GTS (FR DOOR COUTESY SW, FL DOOR COUTESY SW)


    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 / Rear Left Seat / 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 Lock Pos Front door courtesy light switch assembly RH signal ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      		 for RHD
      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

      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL Door Courtesy SW
      OK
      On the GTS screen, the item changes between ON and OFF according to the above.

      Body Electrical > Rear Left Seat > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Door Courtesy Rear door courtesy light switch assembly LH signal ON or OFF

      ON: Rear door LH open

      OFF: Rear door LH closed

      		 -
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    NG

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