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Pinpoint Test Q: Both Fog Lamps Are Inoperative

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. Q1 CHECK THE FOG LAMP SWITCH PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
    • Monitor the SJB fog lamp switch PID (FOG SW) while engaging the fog lamp switch.
    • Does the PID indicate the fog lamp switch is on? 
    1. YES  : Go to  Q4.
    2. NO  : Go to  Q2.
  2. Q2 CHECK THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING article.
    • Is the headlamp switch OK? 
    1. YES  : Go to  Q3.
    2. NO  : INSTALL a new headlamp switch. REFER to Headlamp Switch . TEST the system for normal operation.
  3. Q3 CHECK CIRCUIT CLF21 (GY/VT) FOR AN OPEN 
    • Disconnect: SJB C2280b
    • Measure the resistance between the headlamp switch C205-6, circuit CLF21 (GY/VT), harness side and the SJB C2280b-49, circuit CLF21 (GY/VT), harness side.
      • Fig 1: Checking Circuits For Open
      GF0023465Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  Q5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. Q4 BYPASS THE SJB 
    • Key in OFF position.
    • Disconnect: SJB C2280e
    • Connect a fused (15A) jumper wire between the SJB C2280e-1, circuit CDC34 (WH/OG), harness side and the SJB C2280e-3, circuit CLF12 (BN/YE), harness side.
      • Fig 2: Connecting Fused Jumper Wire
      GF0023466Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Do the fog lamps illuminate? 
    1. YES  : REMOVE the jumper wire. VERIFY the SJB fuse 21 (15A) is OK. If OK, go to  Q5.
    2. NO  : REMOVE the jumper wire. REPAIR circuit CLF12 (BN/YE) for an open. TEST the system for normal operation.
  5. Q5 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. 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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