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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FRONT POWER SEAT CONTROL FUNCTION 
    1. Check that each function of the power seat operates normally by using the front power seat switches.

      OK: Each function of power seat operates normally by using seat switches. 

      NG: GO TO PROBLEM SYMPTOMS TABLE )

    OK: Go to Next Step 

  2. CHECK SEAT MEMORY SWITCH FUNCTION 
    1. Perform a memory operation properly. Check that the buzzer sounds to indicate the completion of the memory operation
    NOTE:
    • The seat position will not be recorded if the SET switch and 2 or more of the memory switches (for example, M1 and M2) are pressed simultaneously.
    • If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

    OK: Seat memory switch function operates normally. 

    NG:  Go to step  3

    OK: SYSTEM IS OK 

  3. CHECK COMBINATION METER FUNCTION 
    1. When the power switch is ON (IG) and the shift lever is on P, check that the combination meter shows that the shift lever is on P.

      OK: Meter shows that shift lever is on P. 

    NG: GO TO METER / GAUGE SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

    OK: Go to Next Step 

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

        D-SEAT 

        D-SEAT REFERENCE

        Tester Display Measurement Item/Range NOrmal Condition
        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 M1 signal/ ON or OFF ON Seat memory switch M1 is ON
        OFF Seat memory switch M1 is OFF
        M2 SW Seat memory switch M2 signal/ ON or OFF ON Seat memory switch M2 is ON
        OFF Seat memory switch M2 is OFF
        M3 SW Seat memory switch M3 signal/ ON or OFF ON Seat memory switch M3 is ON
        OFF Seat memory switch M3 is OFF
      2. Techstream

        Driver Seat 

    DRIVER SEAT REFERENCE

    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 M1 signal/ ON or OFF ON Seat memory switch M1 is ON
    OFF Seat memory switch M1 is OFF
    M2 Switch Seat memory switch M2 signal/ ON or OFF ON Seat memory switch M2 is ON
    OFF Seat memory switch M2 is OFF
    M3 Switch Seat memory switch M3 signal/ ON or OFF ON Seat memory switch M3 is ON
    OFF Seat memory switch M3 is OFF

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

    NG:  Go to step  5

    OK: REPLACE FRONT POWER SEAT SWITCH LH  (See DISASSEMBLY )

  5. INSPECT SEAT MEMORY SWITCH 
    1. Remove the switch.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    Tester Connection Switch Condition Specified Condition
    P7-4 (1) - P7-7 (E) M1 switch pressed Below 1 Ω
    P7-2 (2) - P7-7 (E) M2 switch pressed Below 1 Ω
    P7-1 (3) - P7-7 (E) M3 switch pressed Below 1 Ω
    P7-5 (MMRY) - P7-7 (E) SET switch pressed Below 1 Ω
    Fig 1: Identifying Terminals Of Seat Memory Switch Connector
    G05784866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SEAT MEMORY SWITCH  (See REMOVAL )

    OK: Go to Next Step 

  6. CHECK HARNESS AND CONNECTOR (FRONT DOOR ECU LH - SEAT MEMORY SWITCH) 
    1. Disconnect the P10 ECU connector.
    2. Disconnect the P7 switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    TESTER CONNECTION / SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    P10-13 (M1) - P7-4 (1) Always Below 1 Ω
    P10-14 (M2) - P7-2 (2) Always Below 1 Ω
    P10-15 (M3) - P7-1 (3) Always Below 1 Ω
    P10-16 (MM) - P7-5 (MMRY) Always Below 1 Ω
    P10-29 (MSWE) - P7-7 (E) Always Below 1 Ω
    P10-13 (M1) - Body ground Always 10 kΩ or higher
    P10-14 (M2) - Body ground Always 10 kΩ or higher
    P10-15 (M3) - Body ground Always 10 kΩ or higher
    P10-16 (MM) - Body ground Always 10 kΩ or higher
    P10-29 (MSWE) - Body ground Always 10 kΩ or higher
    Fig 2: Identifying Terminals Of P10 ECU And P7 Switch Connectors
    G05784867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  7. CHECK FRONT DOOR ECU LH (OPERATION) 
    1. After replacing the front door ECU, check that the front power seat control functions operate normally using the front seat switches and seat memory switch.

      OK: Front power seat control functions operate normally 

    NG: REPLACE FRONT POWER SEAT SWITCH LH  (See DISASSEMBLY )

    OK: REPLACE FRONT DOOR ECU LH  (See ON-VEHICLE INSPECTION )

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