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Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Theft Deterrent / Keyless Entry >> Theft Deterrent System >> Certification ECU Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT FUSE (IMB) 
    1. Remove the IMB fuse from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      IMB fuse Always Below 1 Ω

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - BATTERY AND BODY GROUND) 
    1. Disconnect the E29 ECU connector.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying E29 ECU Connector
      G05631094Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E29-17 (E) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E29-1 (+B) - Body ground Always 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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