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PINPOINT TEST B : No Power in ACC - Vehicles with a Conventional Ignition Switch

  1. B1 CHECK FOR ACC VOLTAGE AT THE BCM

    • Disconnect: BCM C2280B.
    • Ignition ACC.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280B-35
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B3.
    No  GO to  B2.

  2. B2 CHECK THE IGNITION ACC CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Disconnect: Ignition Switch.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280B-35
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C250-6

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new ignition switch. REFER to Ignition Switch .
    No  REPAIR the circuit.

  3. B3 CHECK FOR POWER TO THE RUN/ACC RELAY

    • Ignition OFF.
    • Disconnect: BCM fuse 10 (10A).
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Fuse 10 (10A) Input Cavity
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  VERIFY BCM fuse 10 (15A) is OK. If OK, GO to  B4. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible cause of the circuit short.
    No  GO to  B5.

  4. B4 CHECK THE ACCESSORY DELAY RELAY

    • Disconnect: Accessory Delay Relay.
    • Carry out the appropriate relay component test. Refer to Component Testing for component testing.

    Does the relay pass the test? 

    Yes  GO to  B5.
    No  INSTALL a new accessory delay relay.

  5. B5 CHECK FOR CORRECT BCM OPERATION

    • Disconnect and inspect all BCM connectors.
    • Repair:
      • corrosion (install new connector or terminal - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect the BCM connectors and all previously disconnected exterior system connectors. Make sure they seat and latch correctly.
    • Install BCM fuse 10 (15A) (if previously removed).
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new BCM. REFER to Multifunction Electronic Modules or REFER to Multifunction Electronic Modules .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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