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Home › Lexus › 2008 › LS 460L › Repair and Diagnosis › Body & Frame › Seats › 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 TECHSTREAM (SEAT MEMORY SWITCH) 
    1. Check the Data List for proper functioning of the seat memory switch.

      Rear Left Seat 

      REAR LEFT SEAT DATA LIST

      Tester Display Measurement Item/Range Normal Condition
      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 

      REAR RIGHT SEAT DATA LIST

      Tester Display Measurement Item/Range Normal Condition
      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 screen, each item changes between ON and OFF according to above chart. 

      Result 

      RESULT CHART

      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 POSITION CONTROL ECU RH  (See DISASSEMBLY  )

    C: REPLACE POSITION 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  ).
    2. Measure the resistance according to the values in the table below.

      Standard Resistance 

      RESISTANCE SPECIFIED CONDITION

      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
      Fig 1: Identifying Rear Seat Memory Switch Connector Terminals
      G04952562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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) 
    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 

      RESISTANCE SPECIFIED CONDITION

      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
      Fig 2: Identifying O15 ECU And Q7 Switch Connector Terminals
      G04952563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      Standard Resistance 

      RESISTANCE SPECIFIED CONDITION

      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
      Fig 3: Identifying Rear Seat Memory Switch Connector Terminals
      G04952564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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) 
    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 

      RESISTANCE SPECIFIED CONDITION

      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
      Fig 4: Identifying O2 ECU And Q2 Switch Connector Terminals
      G04952565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE REAR DOOR ECU RH  (See COMPONENTS )

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