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Home >> Lexus >> 2008 >> LS 460 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Theft Deterrent >> Theft Deterrent System >> Security Indicator Light Circuit >> Inspection Procedure

Inspection Procedure

  1. CHECK INDICATOR LIGHT ASSEMBLY 
    1. Check if the security indicator lights are normal.

    Result 

    RESULT REFERENCE TABLE

    Result Proceed to
    One security indicator light is malfunctioning A
    Both security indicator lights are malfunctioning B

    HINT:

    If both security indicator lights are malfunctioning, there may be a malfunction in the certification ECU.

    B: REPLACE CERTIFICATION ECU 

    A: Go to Next Step 

  2. PERFORM ACTIVE TEST BY TECHSTREAM (SECURITY INDICATOR) 
    1. Operate the Techstream according to the steps on the display and select "Active Test".

    Smart Access 

    CONTROL RANGE REFERENCE

    Tester Display Test Part Control Range
    Security Indicator Security indicator ON/OFF

    OK: Security indicator illuminates. 

    NG:  Go to step  3

    OK: REPLACE CERTIFICATION ECU 

  3. CHECK HARNESS AND CONNECTOR (DOOR ECU - SECURITY INDICATOR) 
    1. Disconnect the P10*1 or P4*2 ECU connector.
    2. Disconnect the P9*1 or P3*2 indicator connector.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying P10*1 Or P4*2 ECU Connector Terminal
      G04951355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard resistance 

    for LH 

    RESISTANCE REFERENCE TABLE

    Tester Connection Condition Specified Condition
    P10-8 (SID+) - P9-2 (LP2) Always Below 1 Ω
    P10-9 (SID-) - P9-1 (E2) Always Below 1 Ω
    P10-8 (SID+) or P9-2 (LP2) - Body ground Always 10 kΩ or higher
    P10-9 (SID-) or P9-1(E2) - Body ground Always 10 kΩ or higher

    for RH 

    RESISTANCE REFERENCE TABLE

    Tester Connection Condition Specified Condition
    P4-8 (SID+) - P3-2 (LP1) Always Below 1 Ω
    P4-9 (SID-) - P3-1 (E1) Always Below 1 Ω
    P4-8 (SID+) or P3-2 (LP1) - Body ground Always 10 kΩ or higher
    P4-9 (SID-) or P3-1 (E1) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (DOOR ECU - CERTIFICATION ECU AND BODY GROUND) 
    1. Disconnect the N10*1 or N 1*2 ECU connector.
    2. Disconnect the L15 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 2: Identifying Door ECU Connector Terminal & Certification ECU Connector Terminal
      G04951356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard resistance 

    for LH 

    RESISTANCE REFERENCE TABLE

    Tester Connection Condition Specified Condition
    N10-23 < SID1) - L15-2 (IND) Always Below 1 Ω
    N10-1 (GND) - Body ground Always Below 1 Ω
    N10-23 (SID1) or L15-2 (IND) - Body ground Always 10 kΩ or higher

    for RH 

    RESISTANCE REFERENCE TABLE

    Tester Connection Condition Specified Condition
    N1-23 (SID1) - L15-2 (IND) Always Below 1 Ω
    N1-1 (GND) - Body ground Always Below 1 Ω
    N1-23 (SID1) or L15-2 (IND) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  5. INSPECT INDICATOR LIGHT ASSEMBLY 
    1. Remove the indicator light (see REMOVAL  ).
    2. Check operation of the indicator light.

    OK 

    SPECIFICATION TABLE

    Measurement Condition Specified Condition
    Battery positive (+) → Terminal 2 (LP2*1, LP1*2)
    Battery positive (+) → Terminal 1 (E*1, E1*2)    		 Illuminates
    HINT:
    *1: for LH
    *1: for RH
    NOTE:
    • If the positive (+) lead and the negative (-) lead are incorrectly connected, the security indicator will not turn on.
    • A voltage of more than 12 V will damage the security indicator.
    • If the voltage is too low, the security indicator will not turn on.
      Fig 3: Inspecting Indicator Light Assembly
      G04951357Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE INDICATOR LIGHT ASSEMBLY  (See COMPONENTS )

    OK: Go to Next Step 

  6. CHECK FRONT DOOR ECU (OPERATION) 
    1. Temporarily replace the front door ECU with a new or normally functioning one (see COMPONENTS ).
    2. Check that the security indicator operates normally.

    OK: Security indicator operates normally. 

    NG: REPLACE CERTIFICATION ECU 

    OK: REPLACE FRONT DOOR ECU  (See COMPONENTS )

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