In the hierarchy of electronics, a module is a component of a larger system. A module can be a circuit component that forms a large piece of equipment.
digikey electronics
Taxonomy, a powerful core module, gives your sites use of the organizational keywords.
Engine control module. It controls the engine-related electronics.
The ABS Control Module on a 1990 Ford Thunderbird is in the electronics tray in the trunk. It hangs from the rear speaker deck.
Body Control Module (BCM) It controls most of the electronics on the vehicle not related to the powertrain.
"Generic Electronics Module" It is used on 1995 and later models according to my Haynes manual.
Behind the passenger glove box, assuming you're looking for the engine control module, and not some dime-a-dozen electronics control module which could be in the trunk, dash, console, etc.
It controls most of the interior electronics such as lights, wipers, locks, theft alarm, etc.
its soldered into the central electronics module (A grey box) which is located behind the dashboard just underneath the main headlight switch.
There is no hierarchy.
hierarchy
In a 2002 Lincoln LS, the REM (Rear Electronics Module) is located in the trunk, typically on the passenger side behind the trim panel. The FEM (Front Electronics Module) is found under the dashboard on the driver's side, near the steering column. Both modules are part of the vehicle's electronic control system, managing various functions and communications throughout the car.