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Home >> Lexus >> 2001 >> LS 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 483 (Engine Immobilizer System - Diagnosis) >> Circuit Inspection >> Security Indicator Light Circuit >> Inspection Procedure
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Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check voltage between terminals IND of transponder key ECU connector and body ground (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 

    PREPARATION: 

    Turn ignition switch ON and switch to diagnosis mode.

    CHECK: 

    Measure voltage between terminals IND of transponder key ECU connector and body ground when security indicator light comes on and goes off.

    OK: 

    INDICATOR LIGHT VOLTAGE

    Indicator light Voltage
    Come on 3-6 V
    Go off Below 1 V
    Fig 1: Measuring Voltage Between Terminals IND Of Transponder Key ECU Connector & Body Ground
    G03375017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Proceed to next circuit inspection shown in problem symptom table (See  PROBLEM SYMPTOMS TABLE  ). 
    2. OK : Go to next step 
  2. Check security indicator. 

    HINT:

    w/LEXUS Navigation System (See TERMINALS OF ECU )

    PREPARATION: 

    Turn ignition switch ON and switch to diagnosis mode.

    CHECK: 

    Measure voltage between terminals IND of transponder key ECU connector and body ground when security indicator light comes on and goes off.

    OK: 

    INDICATOR LIGHT VOLTAGE

    Indicator light Voltage
    Come on 8-10V
    Go off Below 1 V
    Fig 2: Measuring Voltage Between Terminals IND Of Transponder Key ECU Connector & Body Ground
    G03375018Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Repair or Replace wire harness or connector. 
    2. OK : Check and replace multi-information display.