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Pinpoint Test R: The Fog Lamps Are Inoperative

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. R1 MONITOR THE LCM HEADLAMP SWITCH PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: LCM Headlamp Switch PID.
    • Monitor the LCM headlamp switch status PID while placing the headlamp switch in the PARKING LAMPS ON position and engaging the fog lamp switch.
    • Does the headlamp switch PID indicate the fog lamp switch is active? 

    Yes  : GO to R2.

    No  : GO to  R7.

  2. R2 CHECK THE FOG LAMP RELAY 
    • Place the headlamp switch in the OFF position.
    • Key in OFF position.
    • Disconnect: Fog Lamp Relay C1007.
    • Carry out the fog lamp relay component test. Refer to COMPONENT TESTING .
    • Is the fog lamp relay OK? 

    Yes  : GO to R3.

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

  3. R3 CHECK CIRCUIT 1669 (OG/LG) FOR AN OPEN 
    • Key in OFF position.
    • Measure the voltage between the fog lamp relay C1007-3, circuit 1669 (OG/LG), harness side and ground.
      Fig 1: Checking Circuit 1669 (OG/LG) For An Open
      G04585498Courtesy of FORD MOTOR CO.
    • Is the voltage greater then 10 volts? 

    Yes  : GO to R4.

    No  : VERIFY the BJB fuse 16 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

  4. R4 CHECK CIRCUIT 478 (TN/OG) FOR AN OPEN 
    • Connect a fused (15A) jumper wire between the fog lamp relay C1007-3, circuit 1669 (OG/LG), harness side and the fog lamp relay C1007-5, circuit 478 (TN/OG), harness side.
      Fig 2: Connecting Fused Jumper Wire Between Connector 2257 Terminals
      G04585499Courtesy of FORD MOTOR CO.
    • Do the fog lamps illuminate? 

    Yes  : REMOVE the jumper wire. GO to R5.

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

  5. R5 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance between the fog lamp relay C1007-2, circuit 57 (BK), harness side and ground.
      Fig 3: Measuring Resistance Between Fog Lamp Relay C1007 Pin 2, Circuit 12 (LG/BK), Harness Side And Ground
      G04585500Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to R6.

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

  6. R6 CHECK CIRCUIT 1347 (DB/WH) FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: LCM C2145b.
    • Measure the resistance between the fog lamp relay C1007-1, circuit 1347 (DB/WH), harness side and the LCM C2145a-12, circuit 1347 (DB/WH), harness side; and between the fog lamp relay C1007-1, circuit 1347 (DB/WH), harness side and ground.
      Fig 4: Checking Circuit 1347 (DB/WH) For An Open And Short To Ground
      G04585501Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the fog lamp relay and the LCM, and greater than 10,000 ohms between the fog lamp relay and ground? 

    Yes  : GO to  R9.

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

  7. R7 CHECK THE HEADLAMP SWITCH INPUT 
    • Place the headlamp switch in the OFF position.
    • Key in OFF position.
    • Disconnect: LCM C2145b.
    • Place the headlamp switch in the PARKING LAMPS ON position and engage the fog lamp switch.
    • Measure the resistance between the LCM C2145b-11, circuit 477 (LB/BK), harness side and ground.
      Fig 5: Measuring Resistance Between LCM C2145B-11, Circuit 477 (LB/BK), Harness Side And Ground
      G04585502Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to  R9.

    No  : GO to R8.

  8. R8 CHECK CIRCUIT 477 (LB/BK) FOR AN OPEN 
    • Disconnect: Headlamp Switch C205a.
    • Measure the resistance between the LCM C2145b-11, circuit 477 (LB/BK), harness side and the headlamp switch C202a-6, circuit 477 (LB/BK), harness side.
      Fig 6: Checking Circuit 477 (LB/BK) For An Open
      G04585503Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 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.

  9. R9 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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