REAR POWER SEAT CONTROL SYSTEM Power Seat Position is not Memorized

DESCRIPTION

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

WIRING DIAGRAM

A01GXDRE39
A01GXDRE40

INSPECTION PROCEDURE

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.

    NG

    READ VALUE USING INTELLIGENT TESTER (SEAT MEMORY SWITCH) Click here

    OK

    END

  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

      		 -
      Cancel SW Seat memory CAN switch signal / ON or OFF

      ON: Memory CAN switch is ON

      OFF: Memory CAN switch 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

      		 -
      Cancel SW Seat memory CAN switch signal / ON or OFF

      ON: Memory CAN switch is ON

      OFF: Memory CAN switch 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 (except Ottoman):

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

      • for LH Side (for Ottoman):

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

      • for RH Side (except Ottoman):

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

      • for RH Side (for Ottoman):

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


    B

    REPLACE POSITION CONTROL ECU RH

    C

    INSPECT REAR SEAT MEMORY SWITCH LH Click here

    D

    INSPECT REAR SEAT MEMORY SWITCH RH Click here

    A

    REPLACE POSITION CONTROL ECU LH

  5. INSPECT REAR SEAT MEMORY SWITCH LH


    1. A01H1U5E05

      Remove the memory switch Click here.

    2. Measure the resistance according to the value(s) 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)


    1. A01H0C4E17

      Disconnect the O15 ECU connector.

    2. Disconnect the Q7 switch connector.

    3. Measure the resistance according to the value(s) 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 (SGND) 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE REAR DOOR ECU LH Click here

  7. INSPECT REAR SEAT MEMORY SWITCH RH


    1. A01H1U5E06

      Remove the memory switch Click here.

    2. Measure the resistance according to the value(s) 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)


    1. A01H0C4E18

      Disconnect the O2 ECU connector.

    2. Disconnect the Q2 switch connector.

    3. Measure the resistance according to the value(s) 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 (SGND) 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE REAR DOOR ECU RH Click here