Pinpoint Test B: No Power In Acc

WARNING: This page is about a different car, the 2012 Ford Pickup. 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.

B1 CHECK FOR ACC VOLTAGE AT THE BCM
- Disconnect: BCM C2280B.
- Ignition In ACC.
- Measure the voltage between BCM C2280B-35, circuit CDC33 (VT/GN), harness side and ground.
  
  Fig 1: Measuring Voltage Between BCM C2280B-35, Circuit CDC33 (VT/GN), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes : GO to B3.
  - No : GO to B2.
B2 CHECK THE IGNITION ACC CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Measure the resistance between BCM C2280B-35, circuit CDC33 (VT/GN), harness side and ignition switch C250-6, circuit CDC33 (VT/GN), harness side.
  
  Fig 2: Measuring Resistance Between BCM C2280B-35, Circuit CDC33 (VT/GN) And Ignition Switch C250-6, Circuit CDC33 (VT/GN)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
  - Yes : INSTALL a new ignition switch. REFER to IGNITION SWITCH . TEST the system for normal operation.
  - No : REPAIR circuit CDC33 (VT/GN). TEST the system for normal operation.
B3 CHECK THE ACCESSORY DELAY RELAY
- Ignition OFF.
- Disconnect: Accessory Delay Relay.
- Carry out the appropriate relay component test. Refer to OEM WIRING DIAGRAMS for component testing.
- Does the relay pass the test?
  - Yes : GO to B4.
  - No : INSTALL a new accessory delay relay. TEST the system for normal operation.
B4 CHECK FOR POWER TO THE ACCESSORY DELAY RELAY
- Measure the voltage between accessory delay relay cavity 3 and ground.
  
  Fig 3: Measuring Voltage Between Accessory Delay Relay Cavity 3 And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes : GO to B5.
  - No : GO to B6.
B5 CHECK FOR POWER TO THE RUN/ACC RELAY
- Disconnect: BCM Fuse 10 (10A).
- Measure the voltage between BCM fuse 10 (10A), input side and ground.
  
  Fig 4: Measuring Voltage Between BCM Fuse 10 (10A), Input Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes : GO to B7.
  - No : GO to B6.
B6 CHECK THE BCM BATTERY FEED CIRCUIT FOR AN OPEN
- Disconnect: BCM C2280G.
- Measure the voltage between BCM C2280G-1, circuit SDC04 (RD or GY), harness side and ground.
  
  Fig 5: Measuring Voltage Between BCM C2280G-1, Circuit SDC04 (RD Or GY), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes : GO to B7.
  - No : VERIFY fusible links A and B are OK. If OK, REPAIR circuit SDC04 (RD or GY). If not OK, REFER to the Wiring Diagrams information to identify the possible cause of the circuit short. TEST the system for normal operation.
B7 CHECK FOR CORRECT BCM OPERATION
- Disconnect all BCM connectors.
- Check the connectors for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all BCM connectors and make sure they are seated correctly.
- Connect: BCM Fuse 10 (10A) (if previously disconnected).
- Operate the system and verify the concern is still present.
- Is the concern still present?
  - Yes : INSTALL a new BCM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
  - 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.