The LCM is Ford's answer to problems with electronic interference and excessive heat with thermoelectric devices used previously. The LCM is a microprocessor-based module that controls several exterior lighting systems. The system includes headlamps with auto-lamps (if equipped), turn-signals/hazards, corning lamps, parking lamps, and battery saver.
The most common problem with the lighting control module is that the headlights stop working for short periods of time while driving due to the relay in the control module over-heating. Ford recommends only using headlight bulbs that meet their specifications, as this may cause or contribute to this condition.
Ford headlamp bulb specifications – Bulb part # 9007
-low beam light should be rated at 4.30 amps @ 55 watts,
-high beam should be rated at 5.08 amps @ 65 watts.
Before replacing the LCM, make sure all fuses and relays for the exterior lights are good. Refer to your owner's manual for fuse/relay locations. Where is the LCM located? The Lighting Control Module (LCM) would be located behind the lower center of the dashboard.
2003-2005 Crown Victoria and Grand Marquis Headlights Dropping Out While Driving
