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Pinpoint Test B: One Or Both Low Beams Is Inoperative Or Always On - Led (Light Emitting Diode) Headlamps

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  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
    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 output 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 output 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 output 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 output circuit.
    BCM B1533:02 Headlamp Switch Module: General Signal Failure A continuous memory and on-demand DTC that sets when the BCM is missing data from the messages sent from the headlamp switch over the LIN circuit.
    BCM B1533:08 Headlamp Switch Module: Bus Signal/Message Failures A continuous memory and on-demand DTC that sets when the BCM has lost communication with the headlamp switch over the LIN circuit.
    BCM B1533:49 Headlamp Switch Module: Internal Electronic Failure A continuous memory and on-demand DTC that sets when the BCM message from the headlamp switch over the LIN circuit the headlamps switch has an internal failure.
    BCM B1533:56 Headlamp Switch Module: Invalid/Incompatible Configuration A continuous memory and on-demand DTC that sets when the BCM, over the LIN circuit, has detected that the headlamp switch is not properly configured.
    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.

    Possible Sources 

    • Wiring, terminals or connectors
    • LED control module
    • Headlamp assembly
    • BCM
    • BCMC (also known as the BJB)

    Visual Inspection and Pre-checks 

    • Verify the BCMC (also known as the BJB) fuse 101 (15A) (LH headlamp) and fuse 100 (15A) (RH headlamp) is OK.
    • Inspect the headlamp assembly for damage.

  2. B1 CHECK LOW BEAMS OPERATION

    • Ignition ON.

    • Place the headlamp switch in the OFF position.

    • Observe the operation of the LH and RH low beam.

    • Place the headlamp switch in the HEADLAMPS position.

    • Observe the operation of the LH and RH low beam.

    Are either of low beams always illuminated? 

    Yes  GO to  B2
    No  GO to  B10

  3. B2 DETERMINE IF BOTH LOW BEAMS ARE ALWAYS ON

    • Place the headlamp switch in the OFF position.

    • Observe the operation of the LH and RH low beam.

    Are both low beams illuminated? 

    Yes  GO to  B3
    No  GO to  B9

  4. B3 CHECK FOR BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

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

    Is DTC B1533:02, B1533:08, B1533:49 or B1533:56 present? 

    Yes  For BCMDTC B1533:02 or B1533:08, GO to  B4 For BCMDTC B1533:49, INSTALL a new headlamp switch. REFER to: Headlamp Switch . For BCMDTC B1533:56, using the diagnostic scan tool, execute the BCMLIN New Module Initialization routine. Follow the diagnostic scan tool directions. If the initialization routine fails, INSTALL a new headlamp switch. REFER to: Headlamp Switch .
    No  GO to  B9

  5. B4 CHECK THE HEADLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect: Headlamp Switch C205.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C205-6
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B5
    No  VERIFY the BCM fuse 19 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

  6. B5 CHECK THE HEADLAMP SWITCH GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C205-6
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C205-1

    Is the voltage greater than 11 volts? 

    Yes  GO to  B6
    No  REPAIR the circuit.

  7. B6 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT TO THE HEADLAMP SWITCH FOR AN OPEN

    • Ignition OFF.

    • Disconnect: BCM C2280B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C205-6
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280B-49

    Is the resistance less than 3 ohms? 

    Yes  GO to  B7
    No  REPAIR the circuit.

  8. B7 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280B-49
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REMOVE the fused jumper wire. REPAIR the circuit.
    No  REMOVE the fused jumper wire. GO to  B8

  9. B8 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280B-49
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  INSTALL a new headlamp switch. REFER to: Headlamp Switch . TEST the system for normal operation. If the low beams continue to illuminate, GO to  B9
    No  REPAIR the circuit.

  10. B9 CHECK THE LOW BEAM CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect: BCM C2280G.

    • Disconnect: LH Headlamp C1284 or RH Headlamp C1285.

    • Ignition ON.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1284-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1285-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  B22

  11. B10 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  B11
    No  GO to  B12

  12. B11 CHECK THE HEADLAMP RELAY GROUND CIRCUIT FOR AN OPEN

    • Place the headlamp switch in the OFF position.

    • Ignition OFF.

    • Disconnect: BCMC (also known as the BJB) C1035C

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1035C-1
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  B24
    No  REPAIR the circuit.

  13. B12 CHECK FOR VOLTAGE TO THE HEADLAMP LED (LIGHT EMITTING DIODE) CONTROL MODULE

    • Place the headlamp switch in the OFF position.

    • Ignition OFF.

    • Disconnect: LH Headlamp C1284 or RH Headlamp C1285.

    • Ignition ON.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1284-8
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1285-8
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B17
    No  Verify the BCMC (also known as the BJB) fuse 101 (15A) (LH headlamp) and fuse 100 (15A) (RH headlamp) is OK. If OK, GO to  B13 If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

  14. B13 CHECK THE HEADLAMP RELAY ENERGIZE CIRCUIT FOR VOLTAGE

    • Ignition OFF.

    • Disconnect: BCMC (also known as the BJB) C1035B (RH headlamp).

    • Disconnect: BCMC (also known as the BJB) C1035C (LH headlamp).

    • Ignition ON.

    • Place the headlamp switch in the HEADLAMPS position.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1035C-21
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1035B-32
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B16
    No  GO to  B14

  15. B14 CHECK THE HEADLAMP RELAY ENERGIZE CIRCUIT FOR A SHORT TO GROUND

    • Place the gear selector lever in PARK.

    • Ignition OFF.

    • Disconnect: BCM C2280G.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C2280G-11
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C2280G-6
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  B15
    No  REPAIR the circuit.

  16. B15 CHECK THE HEADLAMP RELAY ENERGIZE CIRCUIT FOR AN OPEN

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1035C-21
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280G-11

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1035B-32
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280G-6

    Is the resistance less than 3 ohms? 

    Yes  GO to  B24
    No  REPAIR the circuit.

  17. B16 CHECK THE HEADLAMP RELAY OUTPUT CIRCUIT FOR AN OPEN

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1035C-6
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C1284-8

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1035B-43
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C1285-8

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  INSTALL a new BCMC (also known as the BJB). REFER to: Body Control Module C (BCMC) .

  18. B17 CHECK FOR VOLTAGE FROM THE HEADLAMP LOW BEAM CIRCUIT

    • Place the headlamp switch in the OFF position.

    • Ignition OFF.

    • Disconnect: LH Headlamp C1284 or RH Headlamp C1285.

    • Ignition ON.

    • Place the headlamp switch in the HEADLAMPS position.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1284-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1285-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B21
    No  GO to  B18

  19. B18 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE HEADLAMP LOW BEAM 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
      C1284-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1285-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B22
    No  GO to  B19

  20. B19 CHECK THE LOW BEAM CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Place the headlamp switch in the OFF position.

    • Disconnect: BCM C2280G.

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1284-1
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1285-1
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  B20
    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: Body Control Module (BCM) .

  21. B20 CHECK THE LOW BEAM CIRCUIT FOR AN OPEN

    • Measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1284-1
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280G-4

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1285-1
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 C2280G-2

    Is the resistance less than 3 ohms? 

    Yes  GO to  B24
    No  REPAIR the circuit.

  22. B21 CHECK THE HEADLAMP GROUND CIRCUIT FOR AN OPEN

    • For low series LED headlamps, measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1284-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C1284-10

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1285-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C1285-10

    • For high series LED headlamps, measure:

      LH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1284-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C1284-10
      C1284-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C1284-15

      RH Headlamp 

      Positive Lead Measurement / Action Negative Lead
      C1285-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C1285-10
      C1285-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 C1285-15

    Is the voltage greater than 11 volts? 

    Yes  GO to  B22
    No  REPAIR the circuit in question.

  23. B22 CHECK THE HEADLAMP

    • Place the headlamp switch in the OFF position.

    • Ignition OFF.

    • Substitute the known good headlamp assembly from the opposite side of the vehicle.

    • Ignition ON.

    • Using a diagnostic scan tool, perform the BCM Local Interconnect Network (LIN) New Module Initialization routine.

    • CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON. REPEAT the self-test.

    • Place the headlamp switch in the HEADLAMPS position.

    • Observe the system and determine if the concern is still present.

    Is the concern still present or do the Diagnostic Trouble Codes (DTCs) return? 

    Yes  GO to  B24
    No  GO to  B23

  24. B23 CHECK THE LED (LIGHT EMITTING DIODE) CONTROL MODULE

    • Place the headlamp switch in the OFF position.

    • Ignition OFF.

    • Reinstall the original headlamp assembly for the inoperative side of the vehicle.

    • NOTE: Before using known good LED control module, make sure the part label exactly matches the suspect LED control module. If any differences are noted, do not use the module from the opposite side of the vehicle, INSTALL a new LED control module on the suspect headlamp.

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

    • Ignition ON.

    • Using a diagnostic scan tool, perform the BCM Local Interconnect Network (LIN) New Module Initialization routine.

    • CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON. REPEAT the self-test.

    • Place the headlamp switch in the HEADLAMPS position.

    • Observe the system and determine if the concern is still present.

    Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return? 

    Yes  REMOVE the known good LED control module. INSTALL a new headlamp assembly. REFER to: Headlamp Assembly .
    No  REMOVE the known good LED control module. INSTALL a new LED control module. REFER to: Light Emitting Diode (LED) Control Module .

  25. B24 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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