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Pinpoint Test S: The Fog Lamps Are On Continuously

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. S1 MONITOR THE LCM HEADLAMP SWITCH PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: LCM Headlamp Switch PID.
      • NOTE: Make sure the headlamp switch is in the OFF position.
    • Monitor the LCM headlamp switch status PID.
    • Does the headlamp switch PID indicate the fog lamp switch is active? 

    Yes  : GO to  S5.

    No  : GO to S2.

  2. S2 CHECK CIRCUIT 478 (TN/OG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Fog Lamp Relay C1007.
    • Key in ON position.
    • Do the fog lamps continue to illuminate? 

    Yes  : REPAIR the circuit. TEST the system for normal operation.

    No  : GO to S3.

  3. S3 CHECK THE FOG LAMP RELAY 
    • Key in OFF position.
    • Carry out the fog lamp relay component test. Refer to COMPONENT TESTING .
    • Is the fog lamp relay OK? 

    Yes  : GO to S4.

    No  : INSTALL a new fog lamp relay. TEST the system for normal operation.

  4. S4 CHECK CIRCUIT 1347 (DB/WH) FOR A SHORT TO VOLTAGE 
    • Disconnect: LCM C2145a.
    • Key in ON position.
    • Measure the voltage between the fog lamp relay C1007-1, circuit 1347 (DB/WH), harness side and ground.
      Fig 1: Measuring Voltage Between Fog Lamp Relay C1007 Pin 1, Circuit 477 (LB/BK), Harness Side And Ground
      G04585504Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : REPAIR the circuit. TEST the system for normal operation.

    No  : GO to  S7.

  5. S5 CHECK THE INPUT TO THE LCM 
    • Key in OFF position.
    • Disconnect: LCM C2145b.
    • Measure the resistance between the LCM C2145b-11, circuit 477 (LB/BK), harness side and ground.
      Fig 2: Measuring Resistance Between LCM C2145B-11, Circuit 477 (LB/BK), Harness Side And Ground
      G04585505Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : GO to  S7.

    No  : GO to S6.

  6. S6 CHECK CIRCUIT 477 (LB/BK) FOR A SHORT TO GROUND 
    • Disconnect: Headlamp Switch C205a.
    • Measure the resistance between the LCM C2145b-11, circuit 477 (LB/BK), harness side and ground.
      Fig 3: Measuring Resistance Between LCM C2145B-11, Circuit 477 (LB/BK), Harness Side And Ground
      G04585506Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.

    No  : REPAIR the circuit. TEST the system for normal operation.

  7. S7 CHECK FOR CORRECT LCM OPERATION 
    • Key in OFF position.
    • Disconnect all the LCM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the LCM 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 LCM. 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.

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