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The body control module! Bcm is your fuse box! Itself
The third gens reference a BCM when you look up the software using the OBDII connector and FORScan there are a number of entries that reference software codes for lights, alarms, horn honks, and the battery monitor system. Where it is located, I have no idea.Ford makes no reference to a BCM in either their owners manual shop manuals or parts manuals
Ford does not use a BCM in any 1st or 2nd gen. expeditions and I would almost bet in none of the 3rd gen expys although that I am not 100% sure of the 3rd gens.