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Pinpoint Test K: U3003:16

WARNING: This page is about a different car, the 2023 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to POWER DISTRIBUTION for schematic and connector information.

    Normal Operation and Fault Conditions 

    The BCMC receives battery voltage at all times.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    BCMC U3003:16 Battery Voltage: Circuit Voltage Below Threshold A continuous and on-demand DTC that sets in the BCMC when the BCMC detects lower than expected battery voltage on the voltage supply input circuit.

    Possible Sources 

    • Wiring, terminals or connectors
    • Charging system concern
    • Battery concern
    • BCMC

    Visual Inspection and Pre-checks 

    • Battery connection
    • BCMC connection

  2. K1 RECHECK THE BCMC (BODY CONTROL MODULE C) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Check vehicle service history for recent service actions.

    • Connect the diagnostic tool.

    • Ignition ON.

    • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

    • Ignition OFF.

    • Ignition ON.

    • Wait 10 seconds.

    • Using a diagnostic scan tool, perform the BCMC self-test.

    Is DTC U3003:16 still present? 

    Yes  GO to  K2
    No  The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition. CLEAR the DTC.

  3. K2 CHECK FOR CHARGING SYSTEM DTCS SET IN OTHER MODULES

    • Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

    Are any charging system DTCs recorded? 

    Yes  REFER to: Charging System - 3.5L EcoBoost (272kW/370PS) .
    No  GO to  K3

  4. K3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

    • Check the battery condition and verify the battery is fully charged. REFER to: Battery .

    Is the battery OK and fully charged? 

    Yes  GO to  K4
    No  If the battery is discharged, DIAGNOSE the cause of the low battery condition. REFER to: Battery . If the battery condition fails, INSTALL a new battery. REFER to: Battery .

  5. K4 CHECK THE BCMC (BODY CONTROL MODULE C) VOLTAGE SUPPLY CIRCUIT

    • Ignition OFF.

    • Disconnect Negative battery terminal.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1617A-1
      GFD708163Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11.5 volts? 

    Yes  GO to  K5
    No  REPAIR the circuit.

  6. K5 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION

    • Disconnect and inspect the BCMC connector.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the BCMC connector. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC. REFER to: Body Control Module C (BCMC) .
    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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