Pinpoint Test C: The Low Beam(S) Are Always On

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
Does the FLM pass the network test?
- Yes : GO to C2 .
- No : REFER to MODULE COMMUNICATIONS NETWORK .
C2 CHECK FOR LIGHT SENSOR DTCs
- Review the DTCs recorded from the BCM self-test.
Is DTC B1A85:11 or DTC B1A85:13 present?
- Yes : GO to PINPOINT TEST O .
- No : GO to C3 .
C3 CHECK THE FLM HEADLAMP SWITCH PIDs
NOTE: Make sure the headlamp switch is aligned in the correct position when monitoring the PID.
- Enter the following diagnostic mode on the scan tool: FLM DataLogger.
- While moving the headlamp switch through all positions, monitor the FLM headlamp switch input PID (LT_SW).
Do the headlamp switch positions agree with the PID?
- Yes : GO to C4 .
- No : INSTALL a new FLM . REFER to FRONT LIGHTING CONTROL MODULE (FLM) . TEST the system for normal operation.
C4 CHECK THE BCM OUTPUT
- Ignition OFF.
- Disconnect: BCM C2280E .
- Ignition ON.
Does the LH or RH headlamp continue to illuminate?
- Yes : For vehicles with halogen headlamps, REPAIR circuit CLF04 (BN/BU) (LH headlamp) or circuit CLF05 (BN/GN) (RH headlamp) for a short to voltage as necessary. TEST the system for normal operation.
  For vehicles with halogen headlamps, GO to C5 .
- No : GO to C6.
C5 CHECK FOR VOLTAGE TO THE HEADLAMP ASSEMBLY
- Ignition OFF.
- Disconnect: Always On Headlamp.
- Ignition ON.
- Measure the voltage between the LH headlamp C1021A-2 , circuit CLF04 (BN/BU), harness side and ground; or between the RH headlamp C1041A-2 , circuit CLF05 (BN/GN), harness side and ground.
  
  Fig 1: Measuring Voltage Between LH Headlamp C1021A-2, Circuit CLF04 (BN/BU), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
Is any voltage present?
- Yes : REPAIR circuit CLF04 (BN/BU) (LH headlamp) or circuit CLF05 (BN/GN) (RH headlamp) for a short to voltage as necessary. TEST the system for normal operation.
- No : REPAIR or install a new headlamp assembly. REFER to HEADLAMP ASSEMBLY . TEST the system for normal operation.
C6 CHECK FOR CORRECT BCM OPERATION
- Disconnect all the BCM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the BCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
- Yes : INSTALL a new BCM . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.