REAR POWER SEAT CONTROL SYSTEM Power Seat Position is not Memorized

DESCRIPTION

When the rear seat memory switch's SET is pressed, each position sensor's value is recorded into the position control ECU.

WIRING DIAGRAM

A0019YSE41
A0019YSE42

PROCEDURE


  1. CHECK REAR POWER SEAT CONTROL FUNCTION


    1. Operate the rear power seat switch and check that each power seat function operates normally.

      OK
      Each function operates normally.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. CHECK REAR SEAT RETURN FUNCTION


    1. When the rear door is opened, check that the door open linked return operation operates.

      OK
      Door open linked return operation operates normally.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  3. CHECK REAR SEAT MEMORY FUNCTION


    1. Perform a memory operation correctly. Check that the buzzer sounds to indicate the completion of the memory operation.

      OK
      Seat position is memorized normally.

    OK

    SYSTEM IS OK

    NG

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


    1. Check the Data List for proper functioning of the seat memory switch.

      Rear Left Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SET Switch Seat memory SET switch signal / ON or OFF

      ON: Memory SET switch is ON

      OFF: Memory SET switch is OFF

      		 -
      M1 Switch Seat memory switch M signal / ON or OFF

      ON: Seat memory switch M is ON

      OFF: Seat memory switch M is OFF

      		 -
      Rear Right Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SET Switch Seat memory SET switch signal / ON or OFF

      ON: Memory SET switch is ON

      OFF: Memory SET switch is OFF

      		 -
      M1 Switch Seat memory switch M signal / ON or OFF

      ON: Seat memory switch M is ON

      OFF: Seat memory switch M is OFF

      		 -
      OK
      On tester screen, each item changes between ON and OFF according to above chart.
      Result
      Result Proceed to
      OK (for LH Side) A
      OK (for RH Side) B
      NG (for LH Side) C
      NG (for RH Side) D

      Tech Tips


      • for LH Side (w/o Ottoman):

        If it is necessary to refer to the rear seat assembly, refer to the following procedures Click here.

      • for LH Side (w/ Ottoman):

        If it is necessary to refer to the rear seat assembly, refer to the following procedures Click here.

      • for RH Side (w/o Ottoman):

        If it is necessary to refer to the rear seat assembly, refer to the following procedures Click here.

      • for RH Side (w/ Ottoman):

        If it is necessary to refer to the rear seat assembly, refer to the following procedures Click here.


    A

    REPLACE POSITION CONTROL ECU LH

    B

    REPLACE POSITION CONTROL ECU RH

    D

    INSPECT REAR SEAT MEMORY SWITCH RH Click here

    C

  5. INSPECT REAR SEAT MEMORY SWITCH LH


    1. A001BE5E05
      *1 Component without harness connected: (Rear Seat Memory Switch)
      *2 SET

      Remove the memory switch Click here.

    2. Measure the resistance according to the values in the table below.

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      3 (SET) - 5 (SGND) SET switch pressed Below 1 Ω
      2 (M) - 5 (SGND) M switch pressed Below 1 Ω
      1 (CAN) - 5 (SGND) C switch pressed Below 1 Ω

    NG

    REPLACE REAR SEAT MEMORY SWITCH LH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (REAR DOOR ECU RH - REAR SEAT MEMORY SWITCH LH AND BODY GROUND)


    1. Disconnect the O15 ECU connector.

      A001EZOE01
      *1 Front view of wire harness connector: (to Rear Door ECU LH)
      *2 Front view of wire harness connector: (to Rear Seat Memory Switch LH)
      *3 SET

    2. Disconnect the Q7 switch connector.

    3. Measure the resistance according to the values in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      O15-22 (SET) - Q7-3 (SET) Always Below 1 Ω
      O15-19 (M) - Q7-2 (M) Always Below 1 Ω
      O15-18 (CAN) - Q7-1 (CAN) Always Below 1 Ω
      O15-29 (MSWE) - Q7-5 (MSWE) Always Below 1 Ω
      O15-22 (SET) - Body ground Always 10 kΩ or higher
      O15-19 (M) - Body ground Always 10 kΩ or higher
      O15-18 (CAN) - Body ground Always 10 kΩ or higher
      O15-29 (MSWE) - Body ground Always 10 kΩ or higher

    OK

    REPLACE REAR DOOR ECU LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT REAR SEAT MEMORY SWITCH RH


    1. A001BE5E06
      *1 Component without harness connected: (Rear Seat Memory Switch)
      *2 SET

      Remove the memory switch Click here.

    2. Measure the resistance according to the values in the table below.

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      3 (SET) - 5 (SGND) SET switch pressed Below 1 Ω
      2 (M) - 5 (SGND) M switch pressed Below 1 Ω
      1 (CAN) - 5 (SGND) C switch pressed Below 1 Ω

    NG

    REPLACE REAR SEAT MEMORY SWITCH RH Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (REAR DOOR ECU RH - REAR SEAT MEMORY SWITCH RH AND BODY GROUND)


    1. Disconnect the O2 ECU connector.

      A001EZOE02
      *1 Front view of wire harness connector: (to Rear Door ECU RH)
      *2 Front view of wire harness connector: (to Rear Seat Memory Switch RH)
      *3 SET

    2. Disconnect the Q2 switch connector.

    3. Measure the resistance according to the values in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      O2-22 (SET) - Q2-3 (SET) Always Below 1 Ω
      O2-19 (M) - Q2-2 (M) Always Below 1 Ω
      O2-18 (CAN) - Q2-1 (CAN) Always Below 1 Ω
      O2-29 (MSWE) - Q2-5 (MSWE) Always Below 1 Ω
      O2-22 (SET) - Body ground Always 10 kΩ or higher
      O2-19 (M) - Body ground Always 10 kΩ or higher
      O2-18 (CAN) - Body ground Always 10 kΩ or higher
      O2-29 (MSWE) - Body ground Always 10 kΩ or higher

    OK

    REPLACE REAR DOOR ECU RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR