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Pinpoint Test A: No Power In All Ignition Switch Positions

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. A1 ISOLATE THE IGNITION SWITCH 
    • Disconnect: Ignition Switch C250
    • Carry out the Ignition Switch - Electrical test. Refer to Ignition Switch - Electrical  in Component Test.
    • Does the ignition switch pass the test? 
    1. YES  : Go to  A2.
    2. NO  : INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.
  2. A2 CHECK FOR VOLTAGE TO THE IGNITION SWITCH 
    • Measure the voltage between ignition switch C250-4, circuit SBB33 (RD), harness side and ground.
      • Fig 1: Checking Circuit For Voltage
      GF0025614Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : 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.
    2. NO  : Go to  A3.
  3. A3 CHECK CIRCUIT SBB33 (RD) FOR AN OPEN 
    • Disconnect: BJB Fuse 33 (20A)
    • Measure the resistance between ignition switch C250-4, circuit SBB33 (RD), harness side and BJB fuse 33 (20A), output side.
      • Fig 2: Measuring Resistance
      GF0045939Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A4.
    2. NO  : VERIFY BJB fuse 33 (20A) is OK.

      If OK, REPAIR circuit SBB33 (RD). TEST the system for normal operation.

      If not OK, go to  A7.

  4. A4 CHECK CIRCUIT SBB33 (RD) FOR A SHORT TO GROUND 
    • Measure the resistance between ignition switch C250-4, circuit SBB33 (RD), harness side and ground.
      • Fig 3: Measuring Resistance
      GF0045940Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A5.
    2. NO  : REPAIR circuit SBB33 (RD). TEST the system for normal operation.
  5. A5 CHECK FOR VOLTAGE TO BJB FUSE 33 (20A) 
    • Measure the voltage between BJB fuse 33 (20A) input side and ground.
      • Fig 4: Measuring Voltage
      GF0045941Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : 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.
    2. NO  : Go to  A6.
  6. A6 CHECK FOR VOLTAGE TO THE BJB 
    • Measure the voltage between the BJB main feed eyelet, circuit SDC02 (RD) and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new BJB. TEST the system for normal operation.
    2. NO  : VERIFY that the vehicle battery is OK. If OK, REPAIR circuit SDC02 (RD). TEST the system for normal operation.
  7. A7 CHECK THE IGNITION SWITCH OUTPUT CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between ground and:
      • ignition switch C250-1, circuit CDC34 (WH/OG), harness side.
      • ignition switch C250-5, circuit CDC30 (BU/GY), harness side.
      • ignition switch C250-6, circuit CDC33 (VT/GN), harness side.
      • ignition switch C250-7, circuit CDC35 (BU/WH), harness side.
      • Fig 5: Measuring Resistance
      GF0045942Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : The condition is not present at this time. INSTALL a new fuse and TEST the system for an intermittent short to ground.
    2. NO  : REPAIR the affected circuit(s). TEST the system for normal operation.
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