Pinpoint Test B: No Power In Acc

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. 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 multimeter probes.

NOTE: Verify that battery voltage is 10 volts or greater.

B1 CHECK THE IGNITION SWITCH
- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Carry out the Ignition Switch component test. Refer to ENGINE CONTROLS - COMPONENT TESTING -- FUSION, MILAN & MKZ (EXCEPT HYBRID) article and ENGINE CONTROLS - COMPONENT TESTING -- FUSION HYBRID, MILAN HYBRID & MKZ HYBRID article for component testing.
- Did the ignition switch pass the component test?
- Yes : GO to B2 .
- No : INSTALL a new ignition switch. REFER to IGNITION SWITCH in this service information. TEST the system for normal operation.
B2 CHECK THE IGNITION ACC CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280A.
- Measure the resistance between ignition switch C250-6, circuit CDC33 (VT/GN), harness side and SJB C2280A-3, circuit CDC33 (VT/GN), harness side.
  
  Fig 1: Measuring Resistance Between Ignition Switch C250-6, Circuit CDC33 (VT/GN) And SJB C2280A-3, Circuit CDC33 (VT/GN), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to B3 .
- No : REPAIR circuit CDC33 (VT/GN). TEST the system for normal operation.
B3 CHECK THE IGNITION ACC CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between ignition switch C250-6, circuit CDC33 (VT/GN), harness side and ground.
  
  Fig 2: Measuring Resistance Between Ignition Switch C250-6, Circuit CDC33 (VT/GN), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to B4 .
- No : REPAIR circuit CDC33 (VT/GN). TEST the system for normal operation.
B4 CHECK FOR CORRECT SJB OPERATION
- Check SJB C2208A for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: SJB C2280A and make sure the connector is 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 -- FUSION, MILAN & MKZ article. TEST the system for normal operation.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.