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Pinpoint Test B: No Power In Acc

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 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. B1 CHECK FOR VOLTAGE TO THE SJB 
    • Key in OFF position.
    • Disconnect: SJB C2280a
    • Key in ACCESSORY position.
    • Measure the voltage between SJB C2280a-3, circuit CDC33 (VT/GN), harness side and ground.
      • Fig 1: Measuring Voltage
      GF0045943Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B4.
    2. NO  : Go to  B2.
  2. B2 CHECK CIRCUIT CDC33 (VT/GN) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Ignition Switch C250
    • Measure the resistance between SJB C2280a-3, circuit CDC33 (VT/GN), harness side and ignition switch C250-6, circuit CDC33 (VT/GN), harness side.
      • Fig 2: Measuring Resistance
      GF0042510Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B3.
    2. NO  : REPAIR circuit CDC33 (VT/GN). TEST the system for normal operation.
  3. B3 CHECK CIRCUIT CDC33 (VT/GN) FOR A SHORT TO GROUND 
    • Measure the resistance between SJB C2280a-3, circuit CDC33 (VT/GN), harness side and ground.
      • Fig 3: Measuring Resistance
      GF0045944Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  B5.
    2. NO  : REPAIR circuit CDC33 (VT/GN). TEST the system for normal operation.
  4. B4 ISOLATE THE SJB 
    • Connect: SJB C2280a
    • Disconnect: SJB Fuse 45 (5A)
    • Measure the voltage between SJB fuse 45 (5A) input side and ground.
      • Fig 4: Measuring Voltage
      GF0045945Courtesy 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  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. REPEAT the self-test.
  5. B5 ISOLATE THE IGNITION SWITCH 
    • Key in ACCESSORY position.
    • Measure the resistance between ignition switch C250 pin-4, component side and ignition switch C250 pin-6, component side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B6.
    2. NO  : INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.
  6. B6 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • Check SJB C2280a for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect SJB C2280a and make sure it is seated correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. REPEAT the self-test.
    2. 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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