Pinpoint Test B: NO POWER IN ACC

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

B1 CHECK THE IGNITION SWITCH
- Carry out the Ignition Switch Component Test. Refer to COMPONENT TESTING for component testing.
- Is the ignition switch OK?
- Yes : GO to B2.
- No : INSTALL a new ignition switch. TEST the system for normal operation.
B2 CHECK CIRCUIT 30-BB20 (RD) FOR VOLTAGE
- Disconnect: Ignition Switch C250.
- Measure the voltage between ignition switch C250-7, circuit 30-BB20 (RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between Ignition Switch C250-7 And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to B3.
- No : REPAIR the circuit(s) in question. TEST the system for normal operation.
B3 CHECK CIRCUIT 75-DD1 (YE)
- Key in OFF position.
- Disconnect: BJB C270a.
- Key in ON position.
- Measure the voltage between the CJB C270a-15, circuit 75-DD1 (YE), harness side and ground.
  
  Fig 2: Measuring Voltage Between CJB C270A-15, Circuit 75-DD1 (YE), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to B4.
- No : REPAIR the circuit. TEST the system for normal operation.
B4 CHECK THE CENTRAL JUNCTION BOX (CJB) FUSE 13 (5A)
- CHECK the CJB fuse 13 (5A).
- Is the fuse OK?
- Yes : CHECK the instrument cluster for faults. REFER to INSTRUMENT CLUSTER .
- No : INSTALL a new fuse. TEST the system for normal operation.