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Pinpoint Test C: No Power In RUN: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK CIRCUITS 1050 (LG/VT) AND 1716 (GY/YE) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Smart Junction Box (SJB) 2280b.
    • Key in ACCESSORY position.
    • Measure the voltage between the SJB C2280b-4, circuit 1716 (GY/YE), harness side and ground; and between the SJB C2280b-32, circuit 1050 (LG/VT), harness side and ground.
      Fig 1: Checking Circuits 1050 (LG/VT) And 1716 (GY/YE) For Voltage
      G03988583Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to  C4.
    • No  : GO to C2.
  2. C2 CHECK CIRCUIT 1050 (LG/VT) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Ignition Switch C250.
    • Measure the resistance between the ignition switch C250-1, circuit 1050 (LG/VT), harness side, and the SJB C2208b-32, circuit 1050 (LG/VT), harness side; and between the SJB C2208b-32, circuit 1050 (LG/VT), harness side, and ground.
      Fig 2: Checking Circuit 1050 (LG/VT) For Open Or Short To Ground
      G03988584Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the SJB and the ignition switch, and greater than 10,000 ohms between the SJB and ground? 
    • Yes  : GO to C3.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  3. C3 CHECK CIRCUIT 1716 (GY/YE) FOR AN OPEN OR A SHORT TO GROUND 
    • Measure the resistance between the SJB C2208b-4, circuit 1716 (GY/YE), harness side and the ignition switch C250-6, circuit 1716 (GY/YE), harness side; and between the SJB C2208b-4, circuit 1716 (GY/YE), harness side and ground.
      Fig 3: Checking Circuit 1716 (GY/YE) For Open Or Short To Ground
      G03988582Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the SJB and the ignition switch, and greater than 10,000 ohms between the SJB and ground? 
    • Yes  : INSTALL a new ignition switch. REFER to IGNITION SWITCH . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. C4 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the SJB connectors and make sure they are seated correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . REPEAT the self-test.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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