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I believe LCM refers to the lighting control module, a "black box" under the dashboard to the right of where the driver's leg would be. It has lots of integrated circuits and relays that control the lights on the car. Sometimes, the relays come unsoldered or burn out. Standard Operating Procedure is to replace the entire LCM for a few hundred dollars, but it is possible to replace just the bad relay if you're good at working with electronics. The lights on my 2004 Grand marquis got where they would not always come on. Whacking the LCM would usually make them come on. It was a sign one of the relays was loose, and needed replacing or re-soldering. But I totaled the car hitting a deer at 75 MPH before I ever got around to fixing it, so the point is moot now.
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