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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 >> Parking, Rear and License Plate Lamps >> Pinpoint Tests >> Pinpoint Test Q: The Parking, Rear Or License Plate Lamps Are On Continuously >> Pinpoint Test Q: The Parking, Rear Or License Plate Lamps Are On Continuously

Pinpoint Test Q: The Parking, Rear Or License Plate 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.
  1. Q1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB  self-test.
    • Was DTC B1578 recorded? 
    • Yes:  GO to Q2  .
    • No:  GO to  Q4.
  2. Q2 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch C205-5, circuit CLS05 (BU/GY), harness side and ground.
      Fig 1: Measuring Voltage Between Headlamp Switch C205-5, Circuit CLS05 (BU/GY), Harness Side And Ground
      G06183881Courtesy 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 Q3  .
  3. Q3 CHECK THE PARKING LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: SJB  C2280b.
    • Measure the resistance between the headlamp switch C205-5, circuit CLS05 (BU/GY), harness side and ground.
      Fig 2: Measuring Resistance Between Headlamp Switch C205-5, Circuit CLS05 (BU/GY), Harness Side And Ground
      G06099198Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  Q6.
    • No:  REPAIR circuit CLS05 (BU/GY) for a short to ground. TEST the system for normal operation.
  4. Q4 CHECK THE SJB REAR PARKING LAMPS OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: SJB  C2280d.
    • Ignition ON.
    • Do the rear parking lamps continue to illuminate? 
    • Yes:  REPAIR circuit CLS30 (VT/WH) for a short to voltage. TEST the system for normal operation.
    • No:  GO to Q5  .
  5. Q5 CHECK THE SJB FRONT PARKING LAMPS OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: SJB  C2280e.
    • Ignition ON.
    • Do the front parking lamps continue to illuminate? 
    • Yes:  REPAIR circuit CLS30 (VT/WH) for a short to voltage. TEST the system for normal operation.
    • No:  GO to Q6  .
  6. Q6 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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