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Pinpoint Test B: An Individual Front Fog Lamp Is Inoperative Or Always On

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  1. Refer to Wiring Diagrams Fog Lamps 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 B1147:11 Left Front Fog Lamps: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH fog lamp output circuit.
    BCM B1147:15 Left Front Fog Lamps: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects a short to voltage or an open from the LH fog lamp output circuit.
    BCM B1148:11 Right Front Fog Lamps: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the RH fog lamp output circuit.
    BCM B1148:15 Right Front Fog Lamps: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects a short to voltage or an open from the RH fog lamp output circuit.
    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 LH fog lamp 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 a short to voltage or an open from the LH fog lamp 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 RH fog lamp 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 a short to voltage or an open from the RH fog lamp output circuit.

    Possible Sources 

    • Fog lamp assembly
    • Wiring, terminals or connectors
    • BCM

    Visual Inspection and Pre-checks 

    • Inspect the fog lamp assembly for damage.

  2. B1 CHECK THE FRONT FOG LAMP OPERATION

    • Ignition ON.

    • Place the headlamp switch in the PARKLAMPS position and engage the front fog lamp switch.

    • Disengage the front fog lamp switch and place the headlamp switch in the OFF position.

    Is an individual fog lamp always on? 

    Yes  GO to  B2
    No  GO to  B3

  3. B2 CHECK THE FOG LAMP VOLTAGE SUPPLY CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect: BCM C2280G.

    • Ignition ON.

    Is the suspect fog lamp always on? 

    Yes  REPAIR the circuit in question.
    No  GO to  B8

  4. B3 CHECK FOR VOLTAGE TO THE INOPERATIVE FOG LAMP

    • Ignition OFF.

    • Disconnect: For incandescent fog lamps, inoperative LH Fog Lamp C152 or RH Fog Lamp C162.

    • Disconnect: For LED fog lamps, inoperative LH Fog Lamp C1322 or RH Fog Lamp C1323.

    • Ignition ON.

    • Place the headlamp switch in the PARKLAMPS position and engage the front fog lamp switch.

    • For incandescent fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C152-B
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C162-B
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For LED fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1322-2
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1323-2
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B5
    No  GO to  B4

  5. B4 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE FOG LAMP

    • Disengage the front fog lamp switch and 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 PARKLAMPS position and engage the front fog lamp switch.

    • For incandescent fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C152-B
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C162-B
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For LED fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1322-2
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1323-2
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  For incandescent fog lamps, INSTALL a new front fog lamp bulb. REFER to: Front Fog Lamp Bulb . Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver), TEST the system for normal operation. If the DTC or condition returns, INSTALL a new front fog lamp. REFER to: Front Fog Lamp . For LED fog lamps, INSTALL a new front fog lamp. REFER to: Front Fog Lamp .
    No  GO to  B6

  6. B5 CHECK THE INOPERATIVE FOG LAMP GROUND CIRCUIT FOR AN OPEN

    • For incandescent fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C152-B
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C152-A

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C162-B
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C162-A

    • For LED fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1322-2
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C1322-4

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1323-2
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C1323-4

    Is the voltage greater than 11 volts? 

    Yes  For incandescent fog lamps, INSTALL a new front fog lamp bulb. REFER to: Front Fog Lamp Bulb . Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver), TEST the system for normal operation. If the DTC or condition returns, INSTALL a new front fog lamp. REFER to: Front Fog Lamp . For LED fog lamps, INSTALL a new front fog lamp. REFER to: Front Fog Lamp .
    No  REPAIR the circuit.

  7. B6 CHECK FOG LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND

    • Place the headlamp switch in the OFF position.

    • Ignition OFF.

    • Disconnect: BCM C2280G.

    • For incandescent fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C152-B
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C162-B
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For LED fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1322-2
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1323-2
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  B7
    No  REPAIR the circuit. After the repair: If no Diagnostic Trouble Codes (DTCs) are present, TEST the system for normal operation. If DTC U1000:00 is present, CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test (required to enable the lamp output driver if DTC U1000:00 is present). If DTC U3000:49 is present, INSTALL a new BCM. REFER to: Body Control Module (BCM) .

  8. B7 CHECK FOG LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • For incandescent fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C152-B
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280G-12

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C162-B
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280G-5

    • For LED fog lamps, measure:

      LH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1322-2
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280G-12

      RH Front Fog Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1323-2
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280G-5

    Is the resistance less than 3 ohms? 

    Yes  GO to  B8
    No  REPAIR the circuit.

  9. B8 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Disconnect and inspect all BCM and all related in-line 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 and all related in-line 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: Body Control Module (BCM) .
    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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