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 46 (Exterior Lighting System -- F250-F550 Super Duty) >> Diagnosis & Testing >> Fog Lamps >> Pinpoint Tests >> Pinpoint Test S: The Fog Lamps Are On Continuously >> Pinpoint Test S: The Fog Lamps Are On Continuously

Pinpoint Test S: The Fog Lamps Are On Continuously

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. 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. S1 CHECK THE FOG LAMP SWITCH PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SCCM DataLogger.
    • Monitor the SCCM fog lamp switch PID.
    • Does the PID indicate the fog lamp switch is on? 
    • Yes  : GO to S2.
    • No  : GO to  S4.
  2. S2 CHECK THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SCCM DataLogger.
    • Monitor the SCCM fog lamp switch PID.
    • Does the PID indicate the fog lamp switch is on? 
    • Yes  : GO to S3.
    • No  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.
  3. S3 CHECK THE FOG LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SCCM C2414A.
    • Measure the resistance between the headlamp switch C205-5, circuit CLF21 (GY/VT), harness side and ground.
      Fig 1: Measuring Resistance Between Headlamp Switch C205-5, Circuit CLF21 (GY/VT), Harness Side And Ground
      G06065299Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to  S6.
    • No  : REPAIR circuit CLF21 (GY/VT) for a short to ground. TEST the system for normal operation.
  4. S4 CHECK THE BCM FOG LAMP INDICATOR OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: BCM C2280A.
    • Ignition ON.
    • Do the fog lamps continue to illuminate? 
    • Yes  : GO to S5.
    • No  : REPAIR circuit CLF12 (BN/YE) (between the BCM and the headlamp switch) for a short to voltage. TEST the system for normal operation.
  5. S5 CHECK THE BCM FOG LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: BCM C2280E.
    • Ignition ON.
    • Do the fog lamps continue to illuminate? 
    • Yes  : REPAIR circuit CLF12 (BN/YE) (between the BCM and the fog lamps) for a short to voltage. TEST the system for normal operation.
    • No  : GO to  S7.
  6. S6 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.
  7. S7 CHECK FOR CORRECT BCM OPERATION 
    • Ignition OFF.
    • 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