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Pinpoint Test U: The Fog Lamps Are On Continuously

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. U1 CHECK FOR RECORDED SJB DTCs 
    • Check the recorded results from the SJB self-test.
    • Is DTC B2254 present? 
    1. Yes  : GO to U2.
    2. No  : GO to  U4.
  2. U2 CHECK THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB Self-Test.
      • NOTE: Other DTCs will be present with the headlamp switch disconnected and should be ignored.
    • Repeat the SJB self-test.
    • Is DTC B2254 still present? 
    1. Yes  : GO to U3.
    2. No  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH  in this service information. CLEAR the DTCs. REPEAT the self-test.
  3. U3 CHECK THE FOG LAMPS ON REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280b.
    • Measure the resistance between the headlamp switch C205-5, circuit CLF21 (GY/VT), harness side and ground.
      Fig 1: Measuring Resistance Between Headlamp Switch C205-5, Circuit CLF21 (GY/VT), Harness Side And Ground
      G06065299Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to  U6.
    2. No  : REPAIR circuit CLF21 (GY/VT) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  4. U4 CHECK THE SJB FOG LAMPS OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE (TO HEADLAMP SWITCH) 
    • Ignition OFF.
    • Disconnect: SJB C2280a.
    • Ignition ON.
    • Do the fog lamps continue to illuminate? 
    1. Yes  : GO to U5.
    2. No  : REPAIR circuit CLF12 (BN/YE) to the headlamp switch for a short to voltage. TEST the system for normal operation.
  5. U5 CHECK THE SJB FOG LAMPS OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE (TO THE FOG LAMPS) 
    • Ignition OFF.
    • Disconnect: SJB C2280e.
    • Ignition ON.
    • Do the fog lamps continue to illuminate? 
    1. Yes  : REPAIR circuit CLF12 (BN/YE) for a short to voltage. TEST the system for normal operation.
    2. No  : GO to U6.
  6. U6 CHECK FOR CORRECT SJB OPERATION 
    • Ignition OFF.
    • 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 -- FUSION, MILAN & MKZ 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. CLEAR any DTCs. REPEAT the self-test.
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