Question about 2003 Mercury Grand Marquis
For months now the headlights come on when they want so I just pull the brights on....and I have done lots of research on the pc. All say it's a FAULTY "Lighting Control Module" or LCM. But now....I went to start it today and got nothing, not even a lightbulb, and the LCM was clicking vigorously. Now I'm trying to find out if this LCM could be causing my MGM not to start. Someone also said it could be the factory installed alarm. I went looking for the alarm to disconnect it but could not find it. Any comments?
It is definitely the Lighting Control Module. Just fixed one for a friend. It has internal printed circuit board failure.
It is easy repair but it is expensive. New are 500. Controls much more than lights. Alarm, air bag, door key pad, etc.
You need to have correct part for 2003. tascafordparts,com has the for about $250.
It's just above brake pedal. remove the sond panel. The module will come out without removing other components.
Lighting Control Module (LCM)
The LCM eliminates the electronic interference and heat associated with the thermoelectric devices used previously. The LCM is a microprocessor- based module that controls several vehicle subsystems. It responds to electrical input signals from various switches, sensors, and external modules.
LCM exterior lighting subsystem functions include:
The lighting control module (LCM) is a microprocessor-based module that controls several vehicle subsystems. The LCM responds to electrical input signals from various switches, sensors, and external modules. The LCM is located under the LH side of the instrument panel. Subsystem functions of the LCM include headlamps with autolamps, turn signal lamps/hazard flasher lamps, cornering lamps, parking lamps, courtesy lamps, demand lamps, battery saver and control backlighting.
Module —Lighting Control (LCM) Removal and Installation
Posted on Apr 20, 2009
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Posted on Jan 02, 2017
follow the three links for complete wiring diagram of lcm
Posted on Jun 30, 2009
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