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Home >> Lexus >> 2009 >> IS 250 AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Front Power Seat Control System (With Memory) (Inspection) >> FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System) >> Front Passenger Side Seat Memory Switch Circuit >> Procedure
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Front Passenger Side Seat Memory Switch Circuit: Procedure

  1. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH RH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Read the Data List.
      PASSENGER SEAT

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      M3 Switch M3 switch signal / ON or OFF ON: M3 switch is ON
      OFF: M3 switch is OFF      		 -
      M2 Switch M2 switch signal / ON or OFF ON: M2 switch is ON
      OFF: M2 switch is OFF      		 -
      M1 Switch M1 switch signal / ON or OFF ON: M1 switch is ON
      OFF: M1 switch is OFF      		 -
      SET Switch SET switch signal / ON or OFF ON: SET switch is ON
      OFF: SET switch is OFF      		 -

      OK

      On the tester screen, each item changes between ON and OFF according to the above chart.

    NG → Go to next step 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

  2. INSPECT SEAT MEMORY SWITCH RH 
    1. Remove the seat memory switch RH.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying Seat Memory Switch RH & Connector Terminals
      GTY136157Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Switch Position Specified Condition
      1 (MMRY) - 5 (E) SET switch is pressed Below 1 Ω
      2 (1) - 5 (E) M1 switch is pressed Below 1 Ω
      3 (2) - 5 (E) M2 switch is pressed Below 1 Ω
      4 (3) - 5 (E) M3 switch is pressed Below 1 Ω
      1 (MMRY) - 5 (E) SET switch is not pressed 10 kΩ or higher
      2 (1) - 5 (E) M1 switch is not pressed 10 kΩ or higher
      3 (2) - 5 (E) M2 switch is not pressed 10 kΩ or higher
      4 (3) - 5 (E) SET switch is not pressed 10 kΩ or higher

    NG → REPLACE SEAT MEMORY SWITCH RH 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH RH CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: Identifying Seat Memory Switch RH Connector Terminals
      GTY120007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Specified Condition
      L7-2 (1) - L7-5 (E) 10 kΩ or higher
      L7-3 (2) - L7-5 (E) 10 kΩ or higher
      L7-4 (3) - L7-5 (E) 10 kΩ or higher
      L7-1 (MMRY) - L7-5 (E) 10 kΩ or higher
      L7-5 (E) - Body ground Below 1 Ω

    NG → Go to next step 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

  4. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - SEAT MEMORY SWITCH, BODY GROUND) 
    1. Disconnect the outer mirror control ECU RH connector.
      Fig 3: Identifying Outer Mirror Control ECU & Seat Memory Switch Connector Terminals
      GTY120008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      L10-22 (M1) - L7-2 (1) Below 1 Ω
      L10-23 (M2) - L7-3 (2) Below 1 Ω
      L10-24 (M3) - L7-4 (3) Below 1 Ω
      L10-25 (MM) - L7-1 (MMRY) Below 1 Ω
      L10-26 (MSWE) - L7-5 (E) Below 1 Ω
      L10-26 (MSWE) - Body ground Below 1 Ω
      L7-5 (E) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE OUTER MIRROR CONTROL ECU RH 

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