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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Body & Frame >> Seats >> Seats - Rear Power Seat Control System >> Rear Power Seat Control System >> Power Seat Position is not Memorized >> Inspection Procedure

Inspection 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  

    OK: GO TO NEXT STEP 

  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  

    OK: GO TO NEXT STEP 

  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: Go to step 4 

    OK: SYSTEM IS OK 

  4. READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (SEAT MEMORY SWITCH) 
    1. Check the DATA LIST for proper functioning of the seat memory switch.
      1. Intelligent tester

        RL-SEAT 

        INTELLIGENT TESTER - RL-SEAT

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        SET SW Seat memory SET switch signal / ON or OFF ON: Memory SET switch is ON
        OFF: Memory SET switch is OFF        		 -
        M1 SW 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        		 -

        RR-SEAT 

        INTELLIGENT TESTER - RR-SEAT

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        SET SW Seat memory SET switch signal / ON or OFF ON: Memory SET switch is ON
        OFF: Memory SET switch is OFF        		 -
        M1 SW 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        		 -
      2. Techstream

        Rear Left Seat 

        TECHSTREAM - 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 

        TECHSTREAM - 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 REFERENCE

        Result Proceed to
        Rear seat LH normal A
        Rear seat RH normal (w/o Ottoman) B
        Rear seat RH normal (w/ Ottoman) C
        Rear seat LH malfunctioning D
        Rear seat RH malfunctioning E

    B: REPLACE CONTROL ECU RH  (See DISASSEMBLY )

    C: REPLACE CONTROL ECU RH  (See DISASSEMBLY )

    D: Go to step 5 

    E: Go to step   7 

    A: REPLACE POSITION CONTROL ECU LH (See  DISASSEMBLY  ) 

  5. INSPECT REAR SEAT MEMORY SWITCH LH 
    1. Remove the memory switch (see REMOVAL ).
      Fig 1: Identifying Rear Seat Memory Switch LH Connector Terminals
      G04952562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the values in the table below.

      Standard resistance 

      REAR SEAT MEMORY SWITCH LH

      Tester Connection Switch Condition Specified Condition
      Q7-3 (SET) - Q7-5 (SGND) SET switch pressed Below 1 Ω
      Q7-2 (M) - Q7-5 (SGND) M switch pressed Below 1 Ω
      Q7-1 (CAN) - Q7-5 (SGND) C switch pressed Below 1 Ω

    NG: REPLACE REAR SEAT MEMORY SWITCH LH (See  REMOVAL  ) 

    OK: GO TO NEXT STEP 

  6. CHECK HARNESS AND CONNECTOR (REAR DOOR ECU LH - REAR SEAT MEMORY SWITCH LH AND BODY GROUND) 
      Fig 2: Identifying O15 And Q7 Connectors Terminals
      G04952563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the O15 ECU connector.
    2. Disconnect the Q7 switch connector.
    3. Measure the resistance according to the values in the table below.

      Standard resistance 

      REAR DOOR ECU LH - REAR SEAT MEMORY SWITCH LH AND BODY GROUND

      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

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE REAR DOOR ECU LH  (See COMPONENTS )

  7. INSPECT REAR SEAT MEMORY SWITCH RH 
    1. Remove the memory switch (see REMOVAL ).
      Fig 3: Identifying Rear Seat Memory Switch RH Connector Terminals
      G04952564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the values in the table below.

      Standard resistance 

      REAR SEAT MEMORY SWITCH RH

      Tester Connection Switch Condition Specified Condition
      Q2-3 (SET) - Q2-5 (SGND) SET switch pressed Below 1 Ω
      Q2-2 (M) - Q2-5 (SGND) M switch pressed Below 1 Ω
      Q2-1 (CAN) - Q2-5 (SGND) C switch pressed Below 1 Ω

    NG: REPLACE REAR SEAT MEMORY SWITCH RH (See  REMOVAL  ) 

    OK: GO TO NEXT STEP 

  8. CHECK HARNESS AND CONNECTOR (REAR DOOR ECU RH - REAR SEAT MEMORY SWITCH RH AND BODY GROUND) 
    Fig 4: Identifying O2 And Q2 Connectors Terminals
    G04952565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the O2 ECU connector.
    2. Disconnect the Q2 switch connector.
    3. Measure the resistance according to the values in the table below.

      Standard resistance 

      REAR DOOR ECU RH - REAR SEAT MEMORY SWITCH RH AND BODY GROUND

      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

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE REAR DOOR ECU RH  (See COMPONENTS )

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