Originally Posted by Robert_Nash

The reason the U.S. spec vehicles are non-functional is because a few states require a different height and/or to be left or right of the center line of the vehicle (meaning the current lamp location would be illegal if it is a working fog light) so rather then design a working fog light for various state rules or a completely new bumper cover mold for U.S. vehicles, the dummy unit is used.

If the U.S. ever requires rear fog lights on all vehicles then maybe we'll get some standard requirements.