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 LH 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 front power seat switch LH (w/ Memory). After receiving the request signal, the front power seat switch LH (w/ Memory) memorizes the location data of each motor.

WIRING DIAGRAM

A01ET1JE22

INSPECTION PROCEDURE

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.

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.

    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 engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body / Mirror L / Data List

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

      Mirror L (Outer Mirror Control ECU Assembly LH)
      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

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

    NG

    INSPECT SEAT MEMORY SWITCH Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (BUZZER)


    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 / Driver Seat / Data List.

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

      Driver Seat (Front Power Seat Switch LH (w/ Memory))
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer Buzzer operation OFF/ON -
      OK
      Buzzer sounds normally.

    NG

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here

    OK

  4. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH


    1. Replace the outer mirror control ECU assembly LH Click here.


    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.

      OK
      Seat position memory function operates normally.

    NG

    REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY) Click here

    OK

    END (OUTER MIRROR CONTROL ECU LH WAS DEFECTIVE)

  6. REPLACE FRONT POWER SEAT SWITCH LH (W/ MEMORY)


    1. Replace the front power seat switch LH (w/ Memory) Click here.


    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.

      OK
      Seat position memory function operates normally.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH LH (W/ MEMORY) WAS DEFECTIVE)

  8. INSPECT SEAT MEMORY SWITCH


    1. A01ETBYE01
      Text in Illustration
      *1 M1 Switch
      *2 M2 Switch
      *3 SET Switch
      *a

      Component without harness connected

      (Seat Memory Switch)

      Remove the seat memory switch Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - 1 SET switch is pressed Below 1 Ω
      4 - 1 M1 switch is pressed Below 1 Ω
      3 - 1 M2 switch is pressed Below 1 Ω
      2 - 1 SET switch is not pressed 10 kΩ or higher
      4 - 1 M1 switch is not pressed 10 kΩ or higher
      3 - 1 M2 switch is not pressed 10 kΩ or higher

    NG

    REPLACE SEAT MEMORY SWITCH Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH - SEAT MEMORY SWITCH)


    1. Disconnect the K12 outer mirror control ECU assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K13-2 (MRY) - K12-1 (MM) Always Below 1 Ω
      K13-4 (M1) - K12-2 (M1) Always Below 1 Ω
      K13-3 (M2) - K12-3 (M2) Always Below 1 Ω
      K13-1 (E) - K12-4 (MSWE) Always Below 1 Ω
      K12-7 (GND) - Body ground Always Below 1 Ω
      K12-1 (MM) - Body ground Always 10 kΩ or higher
      K12-2 (M1) - Body ground Always 10 kΩ or higher
      K12-3 (M2) - Body ground Always 10 kΩ or higher
      K12-4 (MSWE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH Click here