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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1596 (Exterior Lighting System) >> Diagnosis And Testing >> Fog Lamps >> Pinpoint Tests >> Pinpoint Test T: The Fog Lamps Are On Continuously >> Pinpoint Test T: The Fog Lamps Are On Continuously

Pinpoint Test T: The Fog Lamps Are On Continuously

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. 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. T1 CHECK FOR RECORDED SJB DTCs 
    • Check the recorded results from the SJB  self-test.
    • Is DTC B2254 present? 
    • Yes:  GO to T2  .
    • No:  GO to  T4.
  2. T2 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch C205-6, circuit CLF29 (BN), harness side and ground.
      Fig 1: Measuring Voltage Between Headlamp Switch C205-6, Circuit CLF29 (BN), Harness Side And Ground
      G06399340Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.
    • No:  GO to T3  .
  3. T3 CHECK THE FOG LAMP ON REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: SJB  C2280b.
    • Measure the resistance between the headlamp switch C205-6, circuit CLF29 (BN), harness side and ground.
      Fig 2: Measuring Resistance Between Headlamp Switch C205-6, Circuit CLF29 (BN), Harness Side And Ground
      G06075692Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  T6.
    • No:  REPAIR circuit CLF29 (BN) for a short to ground. TEST the system for normal operation.
  4. T4 CHECK THE FOG LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE (TO HEADLAMP SWITCH) 
    • Ignition OFF.
    • Disconnect: SJB  C2280a.
    • Ignition ON.
    • Do the fog lamps continue to illuminate? 
    • Yes:  GO to T5  .
    • No:  REPAIR circuit CLF28 (BN/WH) for a short to voltage. TEST the system for normal operation.
  5. T5 CHECK THE FOG LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE (TO FOG LAMPS) 
    • Ignition OFF.
    • Disconnect: SJB  C2280e.
    • Ignition ON.
    • Do the fog lamps continue to illuminate? 
    • Yes:  REPAIR circuit CLF12 (BN/YE) for a short to voltage. TEST the system for normal operation.
    • No:  GO to T6  .
  6. T6 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? 
    • Yes:  INSTALL a new SJB  . 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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