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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 G: B1499:11, B1499:15, B149D:11, B149D:15

Pinpoint Test G: B1499:11, B1499:15, B149D:11, B149D:15

  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 B1499:11 Exterior Lamps Power Supply "A": Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the adaptive front lighting module voltage output circuit.
    BCM B1499:15 Exterior Lamps Power Supply "A": Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open from the adaptive front lighting module voltage output circuit.
    BCM B149D:11 Exterior Lamps Power Supply "B": Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the adaptive front lighting module voltage output circuit.
    BCM B149D:15 Exterior Lamps Power Supply "B": Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open from the adaptive front lighting module voltage output circuit.

    Possible Sources 

    • Wiring, terminals or connectors
    • Headlamp assembly
    • Adaptive front lighting module
    • BCM

  2. G1 CHECK FRONT PARKING LAMPS AND FRONT TURN SIGNAL OPERATION

    • Ignition ON.

    • Place the headlamp switch in the PARKING LAMPS position.

    • Activate the hazard lamp function.

    • Observe the front parking and turn lamps.

    Are both of the LH front parking and turn lamps or both of the RH front parking and turn lamps inoperative? 

    Yes  GO to  G3
    No  If only one of the front turn lamps is inoperative, REFER to: Turn Signal and Hazard Lamps . If only one of the front parking lamps is inoperative, REFER to: Parking, Rear and License Plate Lamps . If all the front parking and turn lamps operate correctly, GO to  G2

  3. G2 CHECK THE HEADLAMP ADAPTIVE FRONT LIGHTING MODULE VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect: BCM C2280B.

    • Disconnect: LH Headlamp C1021A or RH Headlamp C1041A.

    • Ignition ON.

    • Measure:

      For BCMDTC B1499:15 

      Positive Lead Measurement / Action Negative Lead
      C1021A-3
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

      For BCMDTC B149D:15 

      Positive Lead Measurement / Action Negative Lead
      C1041A-3
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  G8

  4. G3 CHECK THE HEADLAMP ADAPTIVE FRONT LIGHTING MODULE VOLTAGE CIRCUIT

    • Ignition OFF.

    • Disconnect: LH Headlamp C1021A or RH Headlamp C1041A.

    • Ignition ON.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-3
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-3
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  G7
    No  GO to  G4

  5. G4 REPEAT THE ON-DEMAND SELF-TEST AND CHECK THE HEADLAMP ADAPTIVE FRONT LIGHTING MODULE VOLTAGE CIRCUIT

    • 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-3
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-3
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  CHECK the internal headlamp harness for open or shorted circuits and damaged or pushed-out pins. If the harness is OK, INSTALL a new adaptive front lighting module. REFER to: Adaptive Front Lighting Module . If the harness is not OK, REPAIR the harness. If the harness cannot be repaired, INSTALL a new headlamp assembly. REFER to: Headlamp Assembly .
    No  GO to  G5

  6. G5 CHECK THE HEADLAMP ADAPTIVE FRONT LIGHTING MODULE VOLTAGE CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect: BCM C2280B.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-3
      GFD620821Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-3
      GFD620821Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  G6
    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. G6 CHECK THE HEADLAMP ADAPTIVE FRONT LIGHTING MODULE VOLTAGE CIRCUIT FOR AN OPEN

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-3
      GFD620821Courtesy of FORD MOTOR COMPANY
      		 C2280B-12

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-3
      GFD620821Courtesy of FORD MOTOR COMPANY
      		 C2280B-5

    Is the resistance less than 3 ohms? 

    Yes  GO to  G10
    No  REPAIR the circuit.

  8. G7 CHECK THE HEADLAMP ADAPTIVE FRONT LIGHTING MODULE GROUND CIRCUIT FOR AN OPEN

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1021A-3
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 C1021A-8

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1041A-3
      GFD620822Courtesy of FORD MOTOR COMPANY
      		 C1041A-8

    Is the voltage greater than 11 volts? 

    Yes  GO to  G8
    No  REPAIR the circuit.

  9. G8 CHECK THE HEADLAMP INTERNAL HARNESS

    • Remove the suspect adaptive front lighting module.

    • 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  G9
    No  REPAIR the harness. If the harness cannot be repaired, INSTALL a new headlamp assembly. REFER to: Headlamp Assembly .

  10. G9 CHECK THE ADAPTIVE FRONT LIGHTING MODULE

    • Connect all disconnected connectors.

    • Substitute the known good adaptive front lighting module from the opposite headlamp.

    • Ignition ON.

    Does the suspect front turn lamp operate correctly? 

    Yes  REMOVE the known good adaptive front lighting module. INSTALL a new adaptive front lighting module. REFER to: Adaptive Front Lighting Module .
    No  REMOVE the known good adaptive front lighting module. GO to  G10.

  11. G10 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  INSTALL a new BCM. Refer to the appropriate Removal and Installation procedure in REMOVAL AND INSTALLATION
    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.
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