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Pinpoint Test X: The Fog Lamps Are On Continuously

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. X1 CHECK THE HEADLAMP SWITCH OUTPUT 
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Monitor the instrument cluster fog lamp switch status PID while rotating the knob to the parking lamps ON position and then engaging the fog lamp switch.
    • Does the PID match with the headlamp switch position? 
    1. Yes  : GO to  X5.
    2. No  : GO to X2.
  2. X2 CHECK THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205.
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING .
    • Is the headlamp switch OK? 
    1. Yes  : GO to X3.
    2. No  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.
  3. X3 CHECK CIRCUIT 8-LD10 (WH/BK) FOR SHORT TO GROUND 
    • Disconnect: Instrument Cluster C220c.
    • Measure the resistance between the instrument cluster C220c-13, circuit 8-LD10 (WH/BK), harness side and ground.
      Fig 1: Measuring Resistance Between Instrument Cluster C220C-13, Circuit 8-LD10 (WH/BK), Harness Side And Ground
      G03202812Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.
    2. No  : GO to X4.
  4. X4 CHECK FOR INSTRUMENT CLUSTER OPERATION 
    • Key in OFF position.
    • Disconnect all instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new instrument cluster. Refer to INFORMATION, GAUGES & WARNING DEVICES . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. REPEAT the self-test.
  5. X5 CHECK THE FEM 
    • Key in OFF position.
    • Disconnect: FEM C201c.
    • Key in ON position.
    • Do the fog lamps continue to illuminate? 
    1. Yes  : GO to  X7.
    2. No  : GO to X6.
  6. X6 CHECK FOR FEM OPERATION 
    • Key in OFF position.
    • Disconnect all FEM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all FEM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new FEM. Refer to MODULE COMMUNICATIONS NETWORK . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. REPEAT the self-test.
  7. X7 CHECK CIRCUIT 30S-LD2 (RD/BU), 30S-LD11 (RD/WH) AND 30S-LD17 (RD/WH) FOR SHORT TO POWER 
    • Disconnect: Fog Lamp Relay C1007.
    • Do the fog lamps continue to illuminate? 
    1. Yes  : REPAIR the circuit as necessary. TEST the system for normal operation.
    2. No  : GO to X8.
  8. X8 CHECK THE FOG LAMP RELAY 
    • Carry out the fog lamp relay component test.

      Refer to COMPONENT TESTING .

    • Is the fog lamp relay OK? 
    1. Yes  : REPAIR circuit 31S-LD9 (BK/GN). TEST the system for normal operation.
    2. No  : INSTALL a new fog lamp relay. TEST the system for normal operation.
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