LEMON Manuals: Even more car manuals for everyone
Home >> Lincoln >> 2021 >> Nautilus Base, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Exterior Lighting - Description And Operation, Diagnosis And Testing >> Diagnosis And Testing >> Headlamps >> Pinpoint Tests >> Pinpoint Test A: One Or Both Low Beams Is Inoperative

Pinpoint Test A: One Or Both Low Beams Is Inoperative

  1. Refer to 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
    BCM B14E0:11 Exterior Lamps Power Supply "C": Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH low beam voltage supply circuit.
    BCM B14E0:15 Exterior Lamps Power Supply "C": Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open from the LH low beam voltage supply circuit.
    BCM B14E1:11 Exterior Lamps Power Supply "D": Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the RH low beam voltage supply circuit.
    BCM B14E1:15 Exterior Lamps Power Supply "D": Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open from the RH low beam voltage supply circuit.
    BCM B1D00:11 Left Low Beam: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH low beam output circuit.
    BCM B1D00:15 Left Low Beam: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open from the LH low beam output circuit.
    BCM B1D01:11 Right Low Beam: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the RH low beam output circuit.
    BCM B1D01:15 Right Low Beam: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open from the RH low beam output circuit.
    BCM U1000:00 Solid State Driver Protection Active -Driver Disabled: No Sub Type Information This DTC sets when the BCM has temporarily shut down the output driver. The module has temporarily disabled an output because an excessive current draw exists (such as a short to ground). The BCM cannot enable the output until the cause of the short is corrected, the Diagnostic Trouble Codes (DTCs) have been cleared and a successful self-test is run. For additional information on BCM Field Effect Transistor (FET) protection, REFER to: Module Controlled Functions - System Operation and Component Description .
    BCM U3000:49 Control Module: Internal Electronic Failure This DTC sets when the BCM has permanently shut down the output driver. The module has permanently disabled an output because an excessive current draw fault (such as a short to ground) has exceeded the limits that the BCM can withstand. CORRECT the cause of the excessive current draw before installing a new BCM. For additional information on BCM Field Effect Transistor (FET) protection, REFER to: Module Controlled Functions - System Operation and Component Description .
    HCM B103C:01 Left Headlamp Control: General Electrical Failure A continuous memory and on-demand DTC that sets in the HCM if the adaptive front lighting module senses a LED outage or an adaptive front lighting module LED driver failure.
    HCM B103D:01 Right Headlamp Control: General Electrical Failure A continuous memory and on-demand DTC that sets in the HCM if the adaptive front lighting module senses a LED outage or an adaptive front lighting module LED driver failure.

    Possible Sources 

    • Wiring, terminals or connectors
    • LED module
    • Headlamp assembly
    • HCM
    • BCM

    Visual Inspection and Pre-checks 

    • Inspect the headlamp assembly for damage.

  2. A1 DETERMINE IF ONE OR BOTH LOW BEAMS ARE INOPERATIVE

    • Ignition ON.

    • Place the headlamp switch in the HEADLAMPS position.

    Are both low beams inoperative? 

    Yes  GO to  A10
    No  GO to  A2

  3. A2 CHECK FOR HCM (HEADLAMP CONTROL MODULE) DIAGNOSTIC TROUBLE CODE (DTCS)

    • Ignition ON.

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

    Is DTC B103C:01 or B103D:01 present? 

    Yes  GO to  A8
    No  GO to  A3

  4. A3 CHECK FOR VOLTAGE TO THE HEADLAMP LED (LIGHT EMITTING DIODE) DRIVER MODULE

    • Place the headlamp switch in the OFF position.

    • Ignition OFF.

    • Disconnect: Inoperative LH Headlamp C1021A or RH Headlamp C1041A.

    • Ignition ON.

    • Place the headlamp switch in the HEADLAMPS position.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-1
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-1
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  A7
    No  GO to  A4

  5. A4 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE HEADLAMP LED (LIGHT EMITTING DIODE) DRIVER MODULE

    • Place the headlamp switch in the OFF position.

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

    • Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver).

    • Ignition OFF.

    • Ignition ON.

    • Place the headlamp switch in the HEADLAMPS position.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-1
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-1
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  A8
    No  GO to  A5

  6. A5 CHECK THE HEADLAMP LED (LIGHT EMITTING DIODE) DRIVER MODULE VOLTAGE CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Place the headlamp switch in the OFF position.

    • Disconnect: BCM C2280B.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-1
      GFD620821Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-1
      GFD620821Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  A6
    No  REPAIR the circuit. After the repair: If no Diagnostic Trouble Codes (DTCs) are present, TEST the system for normal operation. If any BCM Diagnostic Trouble Codes (DTCs) other than DTC U3000:49 are present, CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON. TEST the system for normal operation. If DTC U3000:49 is present, INSTALL a new BCM. Refer to the appropriate Removal and Installation procedure in REMOVAL AND INSTALLATION

  7. A6 CHECK THE HEADLAMP LED (LIGHT EMITTING DIODE) DRIVER MODULE CIRCUITS FOR AN OPEN

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-1
      GFD620821Courtesy of FORD MOTOR COMPANY
      		 C2280B-4

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-1
      GFD620821Courtesy of FORD MOTOR COMPANY
      		 C2280B-2

    Is the resistance less than 3 ohms? 

    Yes  GO to  A10
    No  REPAIR the circuit.

  8. A7 CHECK THE HEADLAMP LED (LIGHT EMITTING DIODE) DRIVER MODULE GROUND CIRCUITS FOR AN OPEN

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-1
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 C1021A-16
      C1021A-1
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 C1021A-8

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-1
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 C1041A-16
      C1041A-1
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 C1041A-8

    Is the voltage greater than 11 volts? 

    Yes  GO to  A8
    No  REPAIR the circuit in question.

  9. A8 CHECK THE HEADLAMP INTERNAL HARNESS

    • Place the headlamp switch in the OFF position.

    • CHECK the internal headlamp harness for open or shorted circuits and damaged or pushed-out pins.

    Is the headlamp internal harness OK? 

    Yes  GO to  A9
    No  REPAIR the harness. If the harness cannot be repaired, INSTALL a new headlamp assembly. REFER to: Headlamp Assembly .

  10. A9 CHECK THE LED (LIGHT EMITTING DIODE) CONTROL MODULE

    • Connect: All disconnected connectors.

    • REMOVE the suspect headlamp LED control module.

    • Substitute the known good headlamp LED control module from the opposite headlamp.

    • Using the diagnostic scan tool, execute the LED Lamp Driver Initialization routine. Follow the diagnostic scan tool directions. CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test.

    • Place the headlamp switch in the HEADLAMPS position.

    Does the suspect headlamp operate correctly? 

    Yes  REMOVE the known good headlamp LED control module. INSTALL a new headlamp LED control module. REFER to: Light Emitting Diode (LED) Control Module . TEST the system for normal operation. If the condition still exists, INSTALL a new headlamp assembly. REFER to: Headlamp Assembly .
    No  REMOVE the known good headlamp LED control module. INSTALL a new headlamp assembly. REFER to: Headlamp Assembly .

  11. A10 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Disconnect and inspect all BCM connectors.

    • 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 BCM connectors. 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 BCM. Refer to the appropriate Removal and Installation procedure in REMOVAL AND INSTALLATION
    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.
scientia non olet · About LEMON Manuals