LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (Exterior Lighting System - F150) >> Diagnosis And Testing >> Headlamps >> Pinpoint Tests >> Pinpoint Test C: The Low Beam(s) Are Always On >> Pinpoint Test C: The Low Beam(S) Are Always On

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

WARNING: This page is about a different car, the 2012 Ford Pickup. 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.
  1. 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 SCCM module pass the network test? 
  2. C2 CHECK FOR LIGHT SENSOR DTCs 
    • Review the DTCs recorded from the BCM self-test.
    • Is DTC B1A85:11 or DTC B1A85:13 present? 
  3. C3 CHECK THE SCCM AUTOLAMP ON REQUEST PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SCCM DataLogger.
    • While placing the headlamp switch in the AUTOLAMPS ON and then OFF position, monitor the SCCM headlamp switch PID (EXT_LMP_SW).
    • Does the PID agree with the headlamp switch when it is in the AUTOLAMPS ON position and indicate it is not in the AUTOLAMPS ON position when the headlamp switch is in the OFF position? 
  4. C4 CHECK THE SCCM 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: SCCM DataLogger.
    • While moving the headlamp switch through all positions (OFF, PARKING LAMPS and HEADLAMPS), monitor the SCCM headlamp switch input PID (EXT_LMP_SW).
    • Do the headlamp switch positions agree with the PID? 
      • Yes  : GO to  C9.
      • No  : GO to C5.
  5. C5 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch, harness side and ground as follows:
      Headlamp Switch Connector-Pin Circuit
      C205-6 CLF23 (WH/VT)
      C205-2 CLS34 (GY)
      C205-7 CLF24 (YE)
      Fig 1: Measuring Voltage Between Headlamp Switch, Harness Side And Ground
      G06141776Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 5 volts? 
      • Yes  : GO to C6.
      • No  : GO to  C7.
  6. C6 CHECK THE HEADLAMP SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Measure the voltage between the headlamp switch C205-6, circuit CLF23 (WH/VT), harness side and headlamp switch C205-3, circuit GD133 (BK), harness side.
      Fig 2: Measuring Voltage Between Headlamp Switch C205-6, Circuit CLF23 (WH/VT) And C205-3, Circuit GD133 (BK), Harness Side
      G06141777Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 5 volts? 
      • Yes  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH  . TEST the system for normal operation.
      • No  : REPAIR circuit GD133 (BK) for an open. TEST the system for normal operation.
  7. C7 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: SCCM C2414A.
    • Measure the resistance between the headlamp switch, harness side and ground as follows:
      Headlamp Switch Connector-Pin Circuit
      C205-6 CLF23 (WH/VT)
      C205-2 CLS34 (GY)
      C205-7 CLF24 (YE)
      Fig 3: Measuring Resistance Between Headlamp Switch, Harness Side And Ground
      G06065222Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
      • Yes  : GO to C8.
      • No  : REPAIR the circuit in question for a short to ground. TEST the system for normal operation.
  8. C8 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN 
    • Measure the resistance between the headlamp switch, harness side and the SCCM, harness side as follows:
      Headlamp Switch Connector-Pin SCCM Connector-Pin Circuit
      C205-6 C2414A-21 CLF23 (WH/VT)
      C205-2 C2414A-22 CLS34 (GY)
      C205-7 C2414A-18 CLF24 (YE)
      Fig 4: Measuring Resistance Between Headlamp Switch And SCCM, Harness Side
      G07409784Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
      • Yes  : GO to  C10.
      • No  : REPAIR the circuit in question for an open. TEST the system for normal operation.
  9. C9 CHECK THE BCM OUTPUT 
    • Ignition OFF.
    • Disconnect: BCM C2280E.
    • Ignition ON.
    • Does the LH or RH headlamp continue to illuminate? 
      • Yes  : REPAIR circuit CLF04 (BN/BU) (LH headlamp) or circuit CLF05 (BU/GN) (RH headlamp) for a short to voltage as necessary. TEST the system for normal operation.
      • No  : GO to  C11.
  10. C10 CHECK FOR CORRECT SCCM OPERATION 
    • Disconnect all the SCCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SCCM 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 SCCM. REFER to STEERING COLUMN SWITCHES . 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.
  11. C11 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.
scientia non olet · About LEMON Manuals