You will probably find that many options are pre-wired just lacking the end module. That is because wire is cheap compared having different harnesses. Especially, as the basic parts of the vehicle are built before the options are added. Let alone the body panels. So much of the vehicle can be built and configured accordingly.
For instance, many of us have working rear fog lights something std. in Europe but not in the USA. All one needs is the Euro light module or mod the US module.
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