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Home › Lexus › 2008 › IS F › Repair and Diagnosis › Body & Frame › Door Locks › Theft Deterrent / Keyless Entry › Theft Deterrent System › Security Indicator Light Circuit › Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG)
    3. Turn the Techstream on
    4. Select the item below in the Active Test and then check that the indicator operates

      Body 

      DIAGNOSTIC NOTE

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

      OK: The security indicator light turns on and off correctly when operated through the Techstream. 

    NG: Go to step 2 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

  2. INSPECT SECURITY INDICATOR 
    1. w/ Navigation System
      1. Remove the multi-display assembly (See REMOVAL ).
      2. Apply battery voltage to the terminals of the multi-display and check the lighting condition of the security indicator.

        Standard 

        MEASUREMENT SPECIFIED CONDITION CHART

        Measurement Condition Specified Condition
        Battery positive (+) → Terminal J50-19 (SEUC)
        Battery negative (-) → Terminal J50-10 (GND1)        		 Lights up
        Fig 1: Identifying J50 Connector Terminal
        G05754540Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        • If the positive (+) lead and the negative (-) lead are incorrectly connected, the security indicator will not light up.
        • Voltage of more than 12 V will damage the security indicator.
        • If the voltage is too low, the security indicator will not light up.
    2. w/o Navigation System
      1. Remove the integration control and panel assembly (See REMOVAL )
      2. Apply battery voltage to the terminals of the center cluster integration switch and check the lighting condition of the security indicator

        Standard 

        MEASUREMENT SPECIFIED CONDITION CHART

        Measurement Condition Specified Condition
        Battery positive (+) → Terminal J54-9 (SEUC)
        Battery negative (-) → Terminal J54-8 (E)        		 Lights up
        Fig 2: Identifying J50 Connector Terminal
        G05754541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        • If the positive (+) lead and the negative (-) lead are incorrectly connected, the security indicator will not light up.
        • Voltage of more than 12 V will damage the security indicator.
        • If the voltage is too low, the security indicator will not light up.

        Result 

        RESULT REFERENCE

        Result Proceed to
        NG (w/ Navigation System) A
        NG (w/o Navigation System) B
        OK C

    A: REPLACE MULTI-DISPLAY ASSEMBLY  (See REMOVAL )

    B: REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY  (See REMOVAL )

    C: Go to next Step 

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - MULTI-DISPLAY OR INTEGRATION CONTROL) 
    1. w/ Navigation System
      1. Disconnect the J74 main body ECU RH connector and J50 multi-display assembly connector
      2. Measure the resistance according to the value (s) in the table below

        Standard Resistance 

        RESISTANCE REFERENCE

        Tester Connection Condition Specified Condition
        J74-24 (IND) - J50-19 (SEUC) Always Below 1 Ω
        J74-24 (IND) - Body ground Always 10 kΩ or higher
        Fig 3: Identifying J54 Connector Terminal
        G05754542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. w/o Navigation System
      1. Disconnect the J74 main body ECU RH connector and J54 integration control and panel connector
      2. Measure the resistance according to the value (s) in the table below

        Standard Resistance 

        RESISTANCE REFERENCE

        Tester Connection Condition Specified Condition
        J74-24 (IND) - J54-9 (SEUC) Always Below 1 Ω
        74-24 (IND) - Body ground Always 10 kΩ or higher
        3. Fig 4: Identifying J74 And J54 Connector Terminal
        G05754543Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  4. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY OR INTEGRATION CONTROL AND PANEL - BODY GROUND) 
    1. w/ Navigation System
      1. Measure the resistance according to the value (s) in the table below

        Standard Resistance 

        RESISTANCE REFERENCE

        Tester Connection Condition Specified Condition
        J50-10 (GND1) - Body ground Always Below 1 Ω
        Fig 5: Identifying J50 Connector Terminal
        G05754544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. w/o Navigation System:
      1. Measure the resistance according to the value (s) in the table below

        Standard Resistance 

        RESISTANCE REFERENCE

        Tester Connection Condition Specified Condition
        J54-9 (E) - Body ground Always Below 1 Ω
      3. Fig 6: Identifying J54 Connector Terminal
      G05754545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 

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