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Inspection and Verification

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: If equipped with fire suppression system, refer to FIRE SUPPRESSION SYSTEM article for Important Safety Warnings. Failure to follow this instruction may result in serious personal injury.
  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Headlamp switch
    • Multifunction switch
    • Central junction box (CJB) fuse(s):
      • 19 (10A) (LH low beam)
      • 21 (10A) (RH low beam)
      • 23 (15A) (high beams)
    • Wiring, terminals or connectors
    • Headlamp bulb
    • Driver door module (DDM)
    • Lighting control module (LCM)
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    4. NOTE: Make sure the headlamp switch is in the OFF position.
    NOTE: Make sure the multifunction switch is in the LOW BEAM position.
    NOTE: Make sure to use the latest scan tool software release.
  4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
    5. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
  5. If the scan tool does not communicate with the VCM:
    • Check the VCM connection to the vehicle.
    • Check the scan tool connection to the VCM.
    • Refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
  6. If the scan tool does not communicate with the vehicle:
    • Verify the ignition key is in the ON position.
    • Verify the scan tool operation with a known good vehicle.
    • Refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the PCM.
  7. Carry out the network test.
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
    • If the network test passes, retrieve and record the continuous memory DTCs.
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the DDM and LCM.
  9. If the DTCs retrieved are related to the concern, go to DTC Charts . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article
  10. If no DTCs related to the concern are retrieved, go to Symptom Chart .
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