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Home >> Lexus >> 2009 >> GS 450h >> Repair and Diagnosis >> Body & Frame >> Exterior Body Panels >> Luggage Compartment Door Opener And Closer (Diagnostic Codes & Circuit Tests) >> Luggage Compartment Door Opener And Closer System >> Driver Side Junction Block ECU Power Source Circuit >> Procedure

Driver Side Junction Block ECU Power Source Circuit: Procedure

  1. INSPECT FUSE (TRK OPN, MPX-B) 
    1. Remove the TRK OPN fuse from the main body ECU LH.
    2. Remove the MPX-B fuse from the engine room No. 1 relay block.
    3. Measure the resistance of the fuses.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (MAIN BODY ECU LH - BATTERY AND BODY GROUND) 
    Fig 1: Identifying PM, PL, PA And PD ECU Connector Terminals
    GTY119974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the PM, PL, PA and PD ECU connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.

      Standard voltage

      Standard resistance 

      Tester Connection Specified Condition
      PM-1 (FUEL) - Body ground 10 to 14 V
      PL-1 (MPXB) - Body ground 10 to 14 V
      Tester Connection Specified Condition
      PA-14 (GND) - Body ground Below 1 Ω
      PD-7 (SGND) - Body ground Below 1 Ω
      PD-8 (SGND) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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