Pinpoint Test B: No Power In Acc

WARNING: This page is about a different car, the 2013 Ford Mustang. 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
- Carry out the IGNITION SWITCH . Refer to appropriate OEM WIRING COMPONENT TESTING for component testing .
- Is the ignition switch OK?
- Yes : GO to B2.
- No : INSTALL a new ignition switch. REFER to IGNITION SWITCH . TEST the system for normal operation.
B2 CHECK THE SJB RUN/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
  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 SJB RUN/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) 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 C2280A for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: Ignition Switch C250.
- Connect: SJB C2280A.
- Make sure the connectors seat correctly, then 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.