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Pinpoint Test S: The Fog Lamps Are Inoperative

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. S1 CHECK THE HEADLAMPS HIGH BEAM OPERATION 
    • Key in OFF position.
    • Place the headlamp switch in the headlamps ON position.
    • Place the multifunction switch in the high beam, then low beam positions.
    • Do the headlamp high beams operate correctly? 
    • Yes  : TURN the headlamp switch OFF. GO to S2.
    • No  : REFER to HEADLAMPS  to continue diagnosis of the high beams.
  2. S2 CHECK THE FOG LAMP RELAY 
    • Disconnect: Fog Lamp Relay C1007.
    • Carry out the fog lamp relay component test. Refer to COMPONENT TESTING article.
    • Is the relay OK? 
    • Yes  : GO to S3.
    • No  : INSTALL a new fog lamp relay. TEST the system for normal operation.
  3. S3 CHECK FOR CIRCUIT 12 (LG/BK) FOR AN OPEN 
    • Disconnect: BJB Fuse 44 (15A).
    • Key in ON position.
    • Measure the voltage between the BJB fuse 44 (15A), circuit 12 (LG/BK), input side and ground.
      Fig 1: Measuring Voltage Between BJB Fuse 44 (15A) And Ground
      G03945656Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : INSTALL the fuse. GO to S4.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. S4 CHECK CIRCUIT 462 (VT) FOR AN OPEN 
    • Measure the voltage between the fog lamp relay C1007-3, circuit 462 (VT), harness side and ground.
      Fig 2: Checking Relay Power Supply
      G03890480Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to S5.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. S5 CHECK FOR VOLTAGE ON CIRCUIT 477 (LB/BK) 
    • Place the headlamp switch in the headlamps ON position and engage the fog lamp switch.
    • Measure the voltage between the fog lamp relay C1007-1, circuit 477 (LB/BK), harness side and ground.
      Fig 3: Measuring Voltage Between Relay Connector And Ground
      G03890493Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  S8.
    • No  : GO to S6.
  6. S6 CHECK THE HEADLAMP SWITCH 
    • Turn the headlamp switch OFF.
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205a.
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING article.
    • Is the headlamp switch OK? 
    • Yes  : GO to S7.
    • No  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.
  7. S7 CHECK CIRCUIT 14 (BN) FOR AN OPEN 
    • Key in ON position.
    • Measure the voltage between the headlamp switch C205a-2, circuit 14 (BN), harness side and ground.
      Fig 4: Measuring Voltage Between Headlamp Switch C205a-2 And Ground
      G03945659Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR circuit 477 (LB/BK). TEST the system for normal operation.
    • No  : REPAIR circuit 1050 (LG/VT). TEST the system for normal operation.
  8. S8 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the fog lamp relay C1007-2, circuit 1205 (BK), harness side and ground.
      Fig 5: Measuring Resistance Between Relay Connector And Ground
      G03890478Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR circuit 478 (TN/9G). TEST the system for normal operation.
    • No  : REPAIR circuit 1205 (BK). TEST the system for normal operation.
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