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Pinpoint Test

NOTE: Due to varying wattage ratings and the resulting current draw differences of certain aftermarket halogen headlamp bulbs, the BCM may activate its short circuit protection strategy, resulting in the low beam output circuit becoming inoperative. Verify the bulbs meet Ford specifications. If the bulbs do not meet Ford specifications, install the correct bulbs. Run the on-demand self-test (required to clear certain DTCs  and reset the BCM). Correct any unresolved DTCs  . Clear all DTCs  .
  1. CHECK FOR VOLTAGE TO THE HEADLAMP ASSEMBLY
    1. Ignition OFF.
    2. Disconnect: Inoperative Headlamp.
    3. Place the headlamp switch in the headlamps on position.
    4. Measure:
      Inoperative Low Beam Ground
      G08036522
      G08036523
      Headlamp Ground
      Connector-Pin Circuit Measurement / Action Pin Circuit
      Left (Halogen) C1021A-2 CLF04 (BN/BU)
      G08036524
      		 - Ground
      Right (Halogen) C1041A-2 CLF05 (BUN/GN) - Ground
      Left (HID) C1284A-1 CLF04 (BN/BU) - Ground
      Right (HID) C1285A-1 CLF05 (BU/GN) - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 2  .
    • No: VERIFY the BCM fuse 17 (10A) (left low beam) or fuse 16 (10A) (right low beam) is OK. If OK, GO to  6  .
  2. CHECK THE HEADLAMP ASSEMBLY GROUND CIRCUIT FOR AN OPEN
    1. Measure:
      Inoperative Low Beam Inoperative Low Beam
      G08036525
      G08036526
      Headlamp Headlamp
      Connector-Pin Circuit Measurement / Action Connector-Pin Circuit
      Left (Halogen) C1021A-2 CLF04 (BN/BU)
      G08036527
      		 Left (Halogen) C1021A-1 GD120 (BK/GN)
      Right (Halogen) C1041A-2 CLF05 (BU/GN) Right (Halogen) C1041A-1 GD123 (BK/GY)
      Left (HID) C1284A-1 CLF04 (BN/BU) Left (HID) C1284A-4 GD120 (BK/GN)
      Right (HID) C1285A-1 CLF05 (BU/GN) Right (HID) C1285A-4 GD123 (BK/GY)

    Is the voltage greater than 11 volts? 

    • Yes: For vehicles equipped with halogen headlamps, REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly .

      For vehicles equipped with HID headlamps, GO to 3  .

    • No: REPAIR the ground circuit in question.
  3. CHECK FOR BALLAST SUPPLY VOLTAGE TO THE HEADLAMP ASSEMBLY
    1. Place the headlamp switch in the off position.
    2. Measure:
      Inoperative Low Beam Inoperative Low Beam
      G08036528
      G08036529
      Headlamp Headlamp
      Connector-Pin Circuit Measurement / Action Connector-Pin Circuit
      Left C1284A-2 SBB57 (RD)
      G08036530
      		 Left C1284A-4 GD120 (BK/GN)
      Right C1285A-2 SBB78 (BN/RD) Right C1285A-4 GD123 (BK/GY)

    Is the voltage greater than 11 volts? 

    • Yes: GO to 4  .
    • No: VERIFY the BJB fuse 57 (20A) (left headlamp) or fuse 78 (20A) (right headlamp) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the cause for the circuit short.
  4. CHECK THE BALLAST
    1. Substitute a known good ballast.
    2. Place the headlamp switch in the headlamps on position.

    Does the inoperative headlamp illuminate? 

    • Yes: REMOVE the known good ballast. INSTALL a new ballast. REFER to Ballast .
    • No: REMOVE the known good ballast. GO to 5  .
  5. CHECK THE HID BULB
    1. Place the headlamp switch in the off position.
    2. Substitute a known good HID bulb.
    3. Place the headlamp switch in the headlamps on position.

    Does the inoperative headlamp illuminate? 

    • Yes: REMOVE the known good HID bulb. INSTALL a new HID bulb. REFER to Headlamp Bulb .
    • No: REMOVE the known good HID bulb. REPAIR the headlamp harness or INSTALL a new headlamp assembly. REFER to Headlamp Assembly .
  6. REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE HEADLAMP
    1. Place the headlamp switch in the off position.
    2. Ignition ON.
    3. Using a scan tool, clear the DTCs  and perform the BCM on-demand self-test.
    4. Place the headlamp switch in the headlamps on position.
    5. Measure:
      Inoperative Low Beam Ground
      G08036531
      G08036532
      Headlamp Ground
      Connector-Pin Circuit Measurement / Action Pin Circuit
      Left (Halogen) C1021A-2 CLF04 (BN/BU)
      G08036533
      		 - Ground
      Right (Halogen) C1041A-2 CLF05 (BU/GN) - Ground
      Left (HID) C1284A-1 CLF04 (BN/BU) - Ground
      Right (HID) C1285A-1 CLF05 (BU/GN) - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 7  .
    • No: GO to  8  .
  7. CHECK THE HEADLAMP HARNESS
    1. Ignition OFF.
    2. Place the headlamp switch in the off position.
    3. Check the headlamp harness for an internal short to the ground circuit.

    Is the headlamp harness OK? 

    • Yes: For vehicles equipped with halogen headlamps, INSTALL a new headlamp bulb. REFER to Headlamp Bulb .

      For vehicles equipped with HID headlamps, INSTALL a new ballast. REFER to Ballast .

    • No: REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly .
  8. CHECK THE BCM LOW BEAM VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND
    1. Ignition OFF.
    2. Place the headlamp switch in the off position.
    3. Disconnect: BCM C2280E.
    4. Measure:
      Inoperative Low Beam Ground
      G08036534
      G08036535
      Headlamp Ground
      Connector-Pin Circuit Measurement / Action Pin Circuit
      Left (Halogen) C1021A-2 CLF04 (BN/BU)
      G08036536
      		 - Ground
      Right (Halogen) C1041A-2 CLF05 (BU/GN) - Ground
      Left (HID) C1284A-1 CLF04 (BN/BU) - Ground
      Right (HID) C1285A-1 CLF05 (BU/GN) - Ground

    Is the resistance greater than 10, 000 ohms? 

  9. CHECK THE BCM LOW BEAM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
    1. Measure:
      Inoperative Low Beam BCM
      G08036537
      G08036538
      Headlamp C2280E
      Connector-Pin Circuit Measurement / Action Pin Circuit
      Left (Halogen) C1021A-2 CLF04 (BN/BU)
      G08036539
      		 2 CLF04 (BN/BU)
      Right (Halogen) C1041A-2 CLF05 (BU/GN) 1 CLF05 (BU/GN)
      Left (HID) C1284A-1 CLF04 (BN/BU) 2 CLF04 (BN/BU)
      Right (HID) C1285A-1 CLF05 (BU/GN) 1 CLF05 (BU/GN)

    Is the resistance less than 3 ohms? 

    • Yes: GO to 10  .
    • No: REPAIR the circuit.
  10. CHECK FOR CORRECT BCM OPERATION
    1. Disconnect and inspect all BCM connectors.
    2. 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
    3. Reconnect the BCM connectors. Make sure they seat and latch correctly.
    4. Operate the system and determine if the concern is still present.

    Is the concern still present? 

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