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Home › Lexus › 2007 › RX 400h AWD › Repair and Diagnosis › Body & Frame › Door Locks › Engine Immobilizer › Engine Immobilizer System › ECU Power Source Circuit › Inspection Procedure

Inspection Procedure

  1. CHECK FUSES (MPX-B, IGN, AM2 No.1) 
    1. Remove the MPX-B, IGN fuses from the instrument panel J/B.
    2. Remove the AM2 No.1 fuse from the fusible link block.
    3. Measure the resistance of the fuses.

      Resistance: 

      Below 1 Ω 

      NG: CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE AND REPLACE FUSE 

      OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY BATTERY) 
    1. Disconnect T9 ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    T9-2 (IG2) - Body ground Ignition switch off Below 1 V
    T9-2 (IG2) - Body ground Ignition switch on 10 to 14 V
    T9-1 (CPUB) - Body ground Always 0 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying Terminals Of IG2 Transponder Key ECU Assembly Connector
    G05279845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Resistance 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    T9-14 (GND) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying Terminals Of GND Transponder Key ECU Assembly Connector
    G05279846Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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