How The Automakers Deliberately Over Complicate Basic Systems To Milk You Dry

A recent video by the @carwizard showed how a simple twilight repair on a Ford Focus turned into a $500 plus dollar fiasco for the customer because the lights are run through a Body Control Module (BCM)
These systems have been around for decades, but the newest generations of them are VIN locked and require dealer programming to function.
For those looking to avoid this sort of over complication and reliance on dealer software and support, it can be a minefield because just choosing a random older car is no guarantee that it will not have a BCM system interfering with their cars most basic functions.
Here's how it works, and what you need to be aware of when choosing a vehicle to beat the system.
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