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

DESCRIPTION

The main body ECU (multiplex network body ECU) receives seat memory switch signals from the outer mirror control ECU assembly (for driver side) via CAN communication. If the seat memory SET switch is being pressed when one of the M1, M2 or M3 switches is pressed, or if one of the M1, M2 or M3 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

A003Z9RE02

INSPECTION PROCEDURE

Note


  • The seat position will not be recorded 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.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally Click here.

      OK
      CAN communication DTC is not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. 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 by using the power seat switch.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER (SEAT MEMORY SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Mirror L*1 or Mirror R*2 / Data List

    5. Read the Data List according to the display on the intelligent tester.

      Mirror L*1 or Mirror R*2 (Outer Mirror Control ECU Assembly (for Driver Side))
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SET Switch SET switch signal / ON or OFF

      ON: SET switch on

      OFF: SET switch off

      		 -
      M1 Switch M1 switch signal / ON or OFF

      ON: M1 switch on

      OFF: M1 switch off

      		 -
      M2 Switch M2 switch signal / ON or OFF

      ON: M2 switch on

      OFF: M2 switch off

      		 -
      M3 Switch M3 switch signal / ON or OFF

      ON: M3 switch on

      OFF: M3 switch off

      		 -

      • *1: for LHD

      • *2: for RHD

      OK
      ON or OFF is displayed on the intelligent tester according to the table above.

    NG

    INSPECT SEAT MEMORY SWITCH Click here

    OK

  4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BUZZER)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Driver Seat / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Driver Seat (Position Control ECU and Switch Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer Buzzer operation ON / OFF -
      OK
      Buzzer sounds normally.

    NG

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    OK

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


    1. Replace the outer mirror control ECU assembly (for driver side) Click here.


    NEXT

  6. CHECK SEAT POSITION MEMORY FUNCTION


    1. Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation Click here.

      Note


      • The seat position will not be recorded 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.

      OK
      Seat position memory function operates normally.

    NG

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

    OK

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

  7. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY


    1. Replace the position control ECU and switch assembly Click here.


    NEXT

  8. CHECK SEAT POSITION MEMORY FUNCTION


    1. Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation Click here.

      Note


      • The seat position will not be recorded 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.

      OK
      Seat position memory function operates normally.

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

    END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)

  9. INSPECT SEAT MEMORY SWITCH


    1. Remove the seat memory switch Click here.

    2. A003Z10E03
      A003YF4E02

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 (MRY) - 5 (E) SET switch is pressed Below 1 Ω
      2 (M1) - 5 (E) M1 switch is pressed Below 1 Ω
      3 (M2) - 5 (E) M2 switch is pressed Below 1 Ω
      4 (M3) - 5 (E) M3 switch is pressed Below 1 Ω
      1 (MRY) - 5 (E) SET switch is not pressed 10 kΩ or higher
      2 (M1) - 5 (E) M1 switch is not pressed 10 kΩ or higher
      3 (M2) - 5 (E) M2 switch is not pressed 10 kΩ or higher
      4 (M3) - 5 (E) M3 switch is not pressed 10 kΩ or higher
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Component without harness connected

      (Seat Memory Switch)

    NG

    REPLACE SEAT MEMORY SWITCH Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - SEAT MEMORY SWITCH)


    1. Disconnect the K7*1 or J8*2 outer mirror control ECU assembly (for driver side) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      z15-1 (MRY) - K7-1 (MM) Always Below 1 Ω
      z15-2 (M1) - K7-2 (M1) Always Below 1 Ω
      z15-3 (M2) - K7-3 (M2) Always Below 1 Ω
      z15-4 (M3) - K7-4 (M3) Always Below 1 Ω
      z15-5 (E) - K7-13 (MSWE) Always Below 1 Ω
      K7-7 (GND) - Body ground Always Below 1 Ω
      K7-1 (MM) - Body ground Always 10 kΩ or higher
      K7-2 (M1) - Body ground Always 10 kΩ or higher
      K7-3 (M2) - Body ground Always 10 kΩ or higher
      K7-4 (M3) - Body ground Always 10 kΩ or higher
      K7-13 (MSWE) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      z17-1 (MRY) - J8-1 (MM) Always Below 1 Ω
      z17-2 (M1) - J8-2 (M1) Always Below 1 Ω
      z17-3 (M2) - J8-3 (M2) Always Below 1 Ω
      z17-4 (M3) - J8-4 (M3) Always Below 1 Ω
      z17-5 (E) - J8-13 (MSWE) Always Below 1 Ω
      J8-7 (GND) - Body ground Always Below 1 Ω
      J8-1 (MM) - Body ground Always 10 kΩ or higher
      J8-2 (M1) - Body ground Always 10 kΩ or higher
      J8-3 (M2) - Body ground Always 10 kΩ or higher
      J8-4 (M3) - Body ground Always 10 kΩ or higher
      J8-13 (MSWE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver Side) Click here