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Home › Lexus › 2007 › IS 350 › Repair and Diagnosis › Body & Frame › Door Locks › Engine Immobilizer › Engine Immobilizer System › Certification ECU Power Source Circuit › Inspection Procedure

Inspection Procedure

  1. INSPECT FUSE (SECURITY) 
    1. Remove the SECURITY fuse from the cowl side junction block RH.
    2. Measure the resistance of the fuse.

    Standard resistance: 

    Below 1 Ω 

    NG : REPLACE FUSE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY) 
    1. Disconnect the P33 ECU connector.
    2. Measure the voltage according to the value(s) in TERMINAL CONNECTION SPECIFIED CONDITION TABLE  .

    Standard voltage 

    Fig 1: Identifying P33 Certification ECU Connector
    G04049185Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL CONNECTION SPECIFIED CONDITION TABLE

    Tester Connection Condition Specified Condition
    P33-1 (+B1) - Body ground Always 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BODY GROUND) 
    1. Measure the resistance according to the value(s) in TERMINAL CONNECTION SPECIFIED CONDITION TABLE  .

    Standard resistance 

    Fig 2: Identifying P33 Certification ECU Connector
    G04049186Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL CONNECTION SPECIFIED CONDITION TABLE

    Tester Connection Condition Specified Condition
    P33-17 (E) - Body ground Always Below 1 ohms

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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