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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1800 (Exterior Lighting System) >> Diagnosis And Testing >> Parking, Rear and License Plate Lamps >> Pinpoint Tests >> Pinpoint Test R: The Parking, Rear Or License Plate Lamps Are On Continuously >> Pinpoint Test R: The Parking, Rear Or License Plate Lamps Are On Continuously

Pinpoint Test R: The Parking, Rear Or License Plate 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.
  1. R1 USE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB self-test.
    • Is DTC B1578 present? 
    1. Yes  : GO to R2.
    2. No  : GO to  R4.
  2. R2 CHECK FOR A VOLTAGE SIGNAL TO THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch C205-2, circuit CLS34 (GY), harness side and ground.
      Fig 1: Measuring Voltage Between Headlamp Switch C205-2, Circuit CLS34 (GY), Harness Side And Ground
      G06258218Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH  in this service information. CLEAR the DTCs. REPEAT the self-test.
    2. No  : GO to R3.
  3. R3 CHECK CIRCUIT CLS34 (YE/OG) FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280b.
    • Measure the resistance between the headlamp switch C205-2, circuit CLS34 (GY), harness side and ground.
      Fig 2: Measuring Resistance Between Headlamp Switch C205-2, Circuit CLS34 (GY), Harness Side And Ground
      G06065292Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to  R5.
    2. No  : REPAIR circuit CLS34 (GY) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  4. R4 CHECK THE SJB PARKING LAMPS OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: SJB C2280e.
    • Ignition ON.
    • Do the parking lamps continue to illuminate? 
    1. Yes  : REPAIR circuit CLS30 (VT/WH) for a short to voltage. TEST the system for normal operation.
    2. No  : GO to R5.
  5. R5 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 -- 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 the DTCs. REPEAT the self-test.
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