FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) Power Seat Position is not Memorized

DTC Code DTC Name
Power Seat Position is not Memorized

DESCRIPTION

The main body ECU (multiplex network body ECU) receives seat memory switch signals from the seat memory switch via CAN communication. If the seat memory SET switch is being pressed when one of the M1 or M2 switches is pressed, or if one of the M1 or M2 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 position control ECU and switch assembly. After receiving the request signal, the position control ECU and switch assembly memorizes the location data of each motor.

WIRING DIAGRAM

B342200E01

CAUTION / NOTICE / HINT

Note:

  • The seat position will not be recorded if the SET switch and 2 of the seat 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.

  • 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 power seat switch.

      Click here

      OK

      Each function of the power seat operates normally using the power seat switch.

    Result

    Proceed to

    OK

    NG
    NG

    GO TO PROBLEM SYMPTOMS TABLE

    Click here

    OK

  2. 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.

      Body Electrical > Mirror L > Data List

      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 Set SW

      SET switch

      ON or OFF

      ON: SET switch on

      OFF: SET switch off

      -

      Body Electrical > Mirror L > Data List

      Tester Display

      Seat Memory Switch1

      Seat Memory Switch2

      Seat Memory Set SW

      OK

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

    Result

    Proceed to

    OK

    NG
    NG

    INSPECT SEAT MEMORY SWITCHClick here

    OK

  3. 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 / Active Test.

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

      Body Electrical > Driver Seat > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Buzzer

      Buzzer operation

      OFF/ON

      -

      Body Electrical > Driver Seat > Active Test

      Tester Display

      Buzzer

      OK

      Buzzer sounds normally.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

    Click here

    OK

  4. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    1. Replace the main body ECU (multiplex network body ECU).

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  5. 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 seat 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

    Result

    Result

    Proceed to

    Seat position memory function operates normally

    A

    Seat position memory function does not operate normally

    B
    A

    END (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU WAS DEFECTIVE])

    B

  6. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

    1. Replace the position control ECU and switch assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  7. 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 seat 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

    Result

    Result

    Proceed to

    Seat position memory function operates normally

    A

    Seat position memory function does not operate normally

    B
    A

    END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

  8. INSPECT SEAT MEMORY SWITCH

    1. Remove the seat memory switch.

      Click here

    2. Inspect the seat memory switch.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE SEAT MEMORY SWITCH

    Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - SEAT MEMORY SWITCH)

    1. Disconnect the G79 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the J13 seat memory switch connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G79-23 (M2) - J13-4 (M2)

      Always

      Below 1 Ω

      G79-25 (M1) - J13-3 (M1)

      Always

      Below 1 Ω

      G79-26 (MM) - J13-2 (MRY)

      Always

      Below 1 Ω

      G79-23 (M2) - Body ground

      Always

      10 kΩ or higher

      G79-25 (M1) - Body ground

      Always

      10 kΩ or higher

      G79-26 (MM) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR