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

DTC Code DTC Name
Power Seat does not Return to Memorized Position

DESCRIPTION

When either the M1 or M2 switch is pressed, the main body ECU (multiplex network body ECU) sends a switch signal to the seat memory switch via CAN communication. Then, the main body ECU (multiplex network body ECU) sends a recall request signal to the position control ECU and switch assembly. The position control ECU and switch assembly operates each motor to achieve each memorized position value.

WIRING DIAGRAM

B342200E01

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 communication system by checking communication function of the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE

  1. 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.

    Result

    Proceed to

    OK

    NG
    NG

    GO TO PROBLEM SYMPTOMS TABLE

    Click here

    OK

  2. 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 of the memory switches are pressed simultaneously.

      • If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

    Result

    Proceed to

    Seat position memory function is normal

    Seat position memory function is not normal
    Seat position memory function is not normal

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

    Click here

    Seat position memory function is normal

  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 switch or M2 switch.

      Click here

      • Ignition switch is off.

      • The ignition switch is ON, and the shift lever is in P.*1

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

      • The ignition 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 (DRIVER DOOR COURTESY SWITCH)Click here

    A

  4. READ VALUE USING GTS (SEAT MEMORY)

    1. Store a seat position in memory for each of the M1 and M2 switches.

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    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 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 SEAT MEMORY SWITCH

    1. Replace the seat memory switch.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  6. CHECK SEAT POSITION RESTORING FUNCTION

    1. Restore a memorized seat position.

      Click here

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

      Note:

      • The seat will not return to the memorized position if 2 of the seat memory switches 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.

    Result

    Proceed to

    Seat position restoring function operates normally

    Seat position restoring function does not operate normally
    Seat position restoring function operates normally

    END (SEAT MEMORY SWITCH WAS DEFECTIVE)

    Seat position restoring function does not operate normally

  7. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

    1. Replace the position control ECU and switch assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  8. CHECK SEAT POSITION RESTORING FUNCTION

    1. Store a seat position in memory.

      Click here

    2. Restore a memorized seat position.

      Click here

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

      Note:

      • The seat will not return to the memorized position if 2 of the seat memory switches 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.

    Result

    Proceed to

    Seat position restoring function operates normally

    Seat position restoring function does not operate normally
    Seat position restoring function operates normally

    END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)

    Seat position restoring function does not operate normally

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

  9. READ VALUE USING GTS (P SWITCH)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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

      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 AND SWITCH ASSEMBLY

    Click here

    NG

    GO TO AUTOMATIC TRANSAXLE SYSTEM (P0705)

    Click hereClick here

  10. READ VALUE USING GTS (DRIVER DOOR COURTESY SWITCH)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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 signal

      ON or OFF

      ON: Driver door open

      OFF: Driver door closed

      -

      Body Electrical > Main Body > Data List

      Tester Display

      FR Door Courtesy SW

      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 AND SWITCH ASSEMBLY

    Click here

    NG

    GO TO LIGHTING SYSTEM (Front Door Courtesy Switch Circuit)

    Click here