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Home >> Lexus >> 2005 >> ES 330 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Engine Immobilizer System - Diagnostics >> Security Indicator Light Circuit >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST USING HAND-HELD TESTER 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch to the ON position, and turn the hand-held tester main switch ON.
    3. Select the item "SECURITY INDIC" in the ACTIVE TEST, and operate it with the hand-held tester.
    4. Check that the security indicator light blinks.

    Standard: 

    The security indicator light blinks. 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON  PROBLEM SYMPTOMS TABLE  

    NG 

  2. CHECK HARNESS AND CONNECTOR (A/C CONTROL PANEL - TRANSPONDER KEY ECU) 
    1. Disconnect the T20 ECU And A14 panel Connectors.
    2. Measure the resistance of the wire harness side connectors.
      STANDARD:

      Tester connection Specified condition
      T20-8 (IND) - A14-10 (LP) Below 1 Ω
      T20-8 (IND) or A14-10 (LP) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step. 

  3. INSPECT TRANSPONDER KEY ECU ASSY 
    1. Reconnect the T20 ECU connectors.
    2. Measure the voltage of the wire harness side connectors.
      Fig 1: Identifying Transponder Key ECU Assy Connector Terminal
      G02938838Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    STANDARD:

    Tester Connection Condition Specified condition
    A14-10 (LP) - Body ground Security indicator light blinks or comes on 10 to 14 V

    NG: REPLACE TRANSPONDER KEY ECU ASSY 

    OK: REPLACE A/C AMPLIFIER ASSY (See  OVERHAUL  ) 

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