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Pinpoint Test R: U3003:16

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  1. Refer to Wiring Diagrams Headlamps/Autolamps for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Exterior Lighting - Overview . REFER to: Exterior Lighting - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    HCM U3003:16 Battery Voltage: Circuit Voltage Below Threshold A continuous memory and on-demand DTC that sets in the HCM if the HCM detects low battery voltage on the voltage supply input.

    Possible Sources 

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

  2. R1 CARRY OUT THE HCM (HEADLAMP CONTROL MODULE) SELF-TEST

    • Ignition ON.

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

    • Wait 10 seconds.

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

    Is DTC U3003:16 still present? 

    Yes  GO to  R2
    No  The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.

  3. R2 CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are any charging system Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  Diagnose the PCMDTC. For 2.7L EcoBoost, REFER to: Electronic Engine Controls . For 3.3L Duratec-V6, REFER to: Electronic Engine Controls . For 3.5L EcoBoost, REFER to: Electronic Engine Controls . For 3.5L V6 PowerBoost, REFER to: Electronic Engine Controls . For 5.0L 32V Ti-VCT, REFER to: Electronic Engine Controls . For 3.0L Power Stroke Diesel, REFER to: Electronic Engine Controls .
    No  GO to  R3

  4. R3 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  R4
    No  CHARGE or INSTALL a new battery. For charging a battery, REFER to: Battery Charging . For installing a new battery. REFER to: Battery .

  5. R4 CHECK THE HCM (HEADLAMP CONTROL MODULE) VOLTAGE SUPPLY

    • Ignition OFF.

    • Disconnect: HCM C2129.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2129-10
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  R5
    No  REPAIR the circuit in question for high resistance.

  6. R5 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROCESSOR GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2129-13
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  R6
    No  REPAIR the circuit for high resistance.

  7. R6 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

    • Disconnect and inspect the HCM 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 HCM connector. Make sure it seats and latches 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 HCM. REFER to: Headlamp Control Module (HCM) .
    No  The system is operating correctly at this time. The concern may have been caused by the module connection. ADDRESS the root cause of any connector or pin issues.
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